WEBVTT

00:00:07.880 --> 00:00:10.759
You're in the bay. Once you get over to the bed,

00:00:10.919 --> 00:00:13.560
we'll give you the story. Everything's going

00:00:13.560 --> 00:00:17.339
to happen super fast. Welcome to the emergency

00:00:17.339 --> 00:00:30.699
room. Pulse check! No pulse. And her blood pressure

00:00:30.699 --> 00:00:44.560
is off. Usually when we approach a medical diagnosis,

00:00:45.079 --> 00:00:47.619
there's this expectation of like, mechanical

00:00:47.619 --> 00:00:50.380
precision. Right, yeah. Like it's a math problem.

00:00:50.560 --> 00:00:53.280
Exactly. I mean, if a patient breaks their arm,

00:00:53.520 --> 00:00:56.219
the x -ray shows that jagged white line, you

00:00:56.219 --> 00:00:58.740
know? The orthopedic surgeon points to it, and

00:00:58.740 --> 00:01:00.740
that's just the reality. It's binary. It's either

00:01:00.740 --> 00:01:03.380
broken or it's not. Yeah. And it's a very comforting

00:01:03.380 --> 00:01:05.659
way to practice medicine because the enemy is

00:01:05.659 --> 00:01:07.920
completely visible. It definitely allows for

00:01:07.920 --> 00:01:11.159
a very neat categorization. You see the problem,

00:01:11.239 --> 00:01:14.280
you fix the problem. But the second you step

00:01:14.280 --> 00:01:17.439
into the world of neurovascular trauma, that

00:01:17.439 --> 00:01:21.150
x -ray machine just shatters. The diagnostic

00:01:21.150 --> 00:01:23.790
landscape gets entirely murky and the timeline

00:01:23.790 --> 00:01:25.950
shrinks down to almost nothing. Oh, absolutely

00:01:25.950 --> 00:01:28.629
nothing. So today you are stepping directly into

00:01:28.629 --> 00:01:31.469
the high stakes rapid -fire environment of the

00:01:31.469 --> 00:01:34.349
intensive care unit. For this deep dive, you

00:01:34.349 --> 00:01:37.670
are putting on the scrubs of an elite ICU nurse

00:01:37.670 --> 00:01:39.810
and you're gonna learn how to think exactly like

00:01:39.810 --> 00:01:42.409
an intensivist who is facing down a brain attack.

00:01:42.450 --> 00:01:44.790
Which, by the way, is a critical shift in terminology

00:01:44.790 --> 00:01:47.019
that we have to address immediately. Yeah, let's

00:01:47.019 --> 00:01:48.540
get into that, because we didn't used to call

00:01:48.540 --> 00:01:51.680
it that. No, we didn't. For decades, the medical

00:01:51.680 --> 00:01:55.099
community used the term CVA, right? Cerebrovascular

00:01:55.099 --> 00:01:57.540
accident. Right. But I mean, think about the

00:01:57.540 --> 00:02:01.439
psychology of the word accident. It implies a

00:02:01.439 --> 00:02:03.879
passive event, like something unfortunate that

00:02:03.879 --> 00:02:06.120
occurred in the past, and now you are just managing

00:02:06.120 --> 00:02:08.460
the aftermath. Oh, I see, like a car crash that's

00:02:08.460 --> 00:02:11.759
already over. Exactly. A brain attack implies

00:02:11.759 --> 00:02:15.759
an active ongoing emergency. It mirrors the urgency

00:02:15.759 --> 00:02:19.039
of a heart attack, because physiologically, they

00:02:19.039 --> 00:02:21.780
are identical mechanisms playing out in different

00:02:21.780 --> 00:02:23.800
organs. Blood flow gets interrupted, right? Yeah,

00:02:23.900 --> 00:02:25.939
blood flow is interrupted, the tissue is starved

00:02:25.939 --> 00:02:28.900
of oxygen, and you have this terrifyingly brief

00:02:28.900 --> 00:02:32.389
window. before irreversible cellular death just

00:02:32.389 --> 00:02:34.090
cascades through the tissue. I really want to

00:02:34.090 --> 00:02:36.610
focus on that window for a second, because with

00:02:36.610 --> 00:02:38.810
cardiac tissue, we know we have a little bit

00:02:38.810 --> 00:02:41.509
of grace time before the myocardium truly dies.

00:02:41.610 --> 00:02:44.849
Yeah, the heart stuff. But the brain is incredibly

00:02:44.849 --> 00:02:47.909
greedy when it comes to oxygen and glucose. So

00:02:47.909 --> 00:02:51.530
how short is this window, actually? Five minutes.

00:02:51.689 --> 00:02:53.810
Wait, just five minutes? That is the absolute

00:02:53.810 --> 00:02:56.460
limit. If blood flow to a section of the brain

00:02:56.460 --> 00:02:59.680
is completely severed, the neurologic metabolism

00:02:59.680 --> 00:03:02.939
alters within 30 seconds. 30 seconds, wow. Yeah.

00:03:03.400 --> 00:03:06.099
Within two minutes, metabolic activity halts

00:03:06.099 --> 00:03:09.340
entirely, and by the five -minute mark, you cross

00:03:09.340 --> 00:03:12.199
the threshold into permanent, irreversible cell

00:03:12.199 --> 00:03:14.020
death. Which, I mean, that begs the question,

00:03:14.219 --> 00:03:17.120
right? If the window is only five minutes, why

00:03:17.120 --> 00:03:19.479
doesn't a stroke just wipe out the entire brain

00:03:19.479 --> 00:03:21.879
by the time the ambulance even arrives? Well...

00:03:21.930 --> 00:03:24.550
Because the brain is an architectural marvel.

00:03:24.729 --> 00:03:28.370
It doesn't rely on just a single isolated pipeline.

00:03:28.550 --> 00:03:31.389
It has backups. Huge backups. It relies heavily

00:03:31.389 --> 00:03:33.969
on collateral circulation. At the base of the

00:03:33.969 --> 00:03:35.650
brain you have the circle of Willis, which is

00:03:35.650 --> 00:03:38.270
this brilliant vascular roundabout that connects

00:03:38.270 --> 00:03:40.889
the anterior and posterior circulations. So it

00:03:40.889 --> 00:03:44.020
can deter the blood. Exactly. When a major artery

00:03:44.020 --> 00:03:46.419
is blocked, the brain immediately attempts to

00:03:46.419 --> 00:03:49.060
reroute blood flow through these collateral pathways

00:03:49.060 --> 00:03:51.580
to bypass the occlusion, you know, to keep the

00:03:51.580 --> 00:03:53.900
downstream tissue alive. It's buying you time.

00:03:54.159 --> 00:03:56.599
Right, it buys you time. But those collateral

00:03:56.599 --> 00:03:58.939
vessels are tiny, they offer high resistance,

00:03:59.240 --> 00:04:01.960
so they cannot sustain the tissue indefinitely.

00:04:02.280 --> 00:04:05.460
So we had this massive ticking clock. And as

00:04:05.460 --> 00:04:08.620
the ICU nurse receiving this patient, your entire

00:04:08.620 --> 00:04:11.659
treatment paradigm really hinges on one crucial

00:04:11.659 --> 00:04:13.860
fork in the road. The biggest fork in the road.

00:04:13.960 --> 00:04:16.779
You are dealing with either a blocked pipe or

00:04:16.779 --> 00:04:20.180
a burst pipe, ischemic or hemorrhagic. And if

00:04:20.180 --> 00:04:22.519
you mix up the pathways, like if you apply the

00:04:22.519 --> 00:04:24.579
blocked pipe treatment to the burst pipe patient,

00:04:25.040 --> 00:04:26.800
you will kill them. It is exactly that black

00:04:26.800 --> 00:04:29.199
and white. So, I mean, we have to start by dominating

00:04:29.199 --> 00:04:31.860
the most common scenario, right? The ischemic

00:04:31.860 --> 00:04:34.259
stroke. the blocked pipe. Let's do the 80 -20

00:04:34.259 --> 00:04:36.899
on that. How common is it? It accounts for 87

00:04:36.899 --> 00:04:40.339
% of all strokes. Almost 9 out of 10. Yeah. And

00:04:40.339 --> 00:04:42.800
within this category, you are looking at two

00:04:42.800 --> 00:04:45.420
distinct mechanisms of blockage. The first one

00:04:45.420 --> 00:04:48.740
is thrombotic. Which is basically a local plumbing

00:04:48.740 --> 00:04:52.170
issue. Exactly. A thrombotic stroke is the gradual

00:04:52.170 --> 00:04:55.110
insidious narrowing of an artery. It's almost

00:04:55.110 --> 00:04:58.029
always driven by atherosclerotic plaque buildup.

00:04:58.170 --> 00:05:00.509
So it's a rusty pipe just slowly occluding over

00:05:00.509 --> 00:05:03.009
decades. Right. And because the narrowing is

00:05:03.009 --> 00:05:06.410
so gradual, the actual final blockage often occurs

00:05:06.410 --> 00:05:09.290
during sleep or rest when blood pressure naturally

00:05:09.290 --> 00:05:12.540
dips and flow becomes sluggish. Oh, so the patient

00:05:12.540 --> 00:05:14.480
just wakes up with a deficit? Yeah, they wake

00:05:14.480 --> 00:05:16.459
up paralyzed. And clinically, these symptoms

00:05:16.459 --> 00:05:19.040
might stutter or present with a stepwise progression

00:05:19.040 --> 00:05:21.899
over a few hours. So the profile for a thrombotic

00:05:21.899 --> 00:05:25.160
stroke is someone with a long history of hypertension,

00:05:25.459 --> 00:05:28.639
severe diabetes, hyperlipidemia. Like, their

00:05:28.639 --> 00:05:30.899
vascular endothelium has been taking a beating

00:05:30.899 --> 00:05:33.680
for years. Precisely. Their vessels are damaged,

00:05:33.819 --> 00:05:35.620
they're rigid, and they're narrowed. But then

00:05:35.620 --> 00:05:38.399
you have the embolic stroke, which presents entirely

00:05:38.399 --> 00:05:40.660
differently. I mean, this isn't a gradual clogging.

00:05:40.680 --> 00:05:43.420
This is more like a boulder rolling down a hill

00:05:43.420 --> 00:05:46.399
and slamming into a narrow canyon. Sudden violent

00:05:46.399 --> 00:05:49.560
onset. In an embolic stroke, the clot forms somewhere

00:05:49.560 --> 00:05:52.470
else in the body, breaks loose, travels up the

00:05:52.470 --> 00:05:55.189
carotid arteries and lodges in a cerebral vessel.

00:05:55.490 --> 00:05:57.110
Usually the middle cerebral artery, right? Yeah,

00:05:57.189 --> 00:05:59.629
mostly the MCA, simply because it's a direct

00:05:59.629 --> 00:06:02.589
wide pathway. And the absolute biggest culprit

00:06:02.589 --> 00:06:04.750
here, the engine that's creating these traveling

00:06:04.750 --> 00:06:08.449
clots, is atrial fibrillation. Because in AFib,

00:06:08.810 --> 00:06:11.389
the atria aren't producing a coordinated forceful

00:06:11.389 --> 00:06:13.370
squeeze, they're just kind of quivering. Right.

00:06:13.550 --> 00:06:16.110
And when blood doesn't move efficiently, it pools.

00:06:16.689 --> 00:06:20.350
When blood pools, it clots. So a tiny clot forms

00:06:20.350 --> 00:06:22.930
in the left atrial appendage. Yep, and then the

00:06:22.930 --> 00:06:25.470
heart suddenly converts to a normal rhythm or

00:06:25.470 --> 00:06:28.129
just manages a strong enough contraction and

00:06:28.129 --> 00:06:30.670
it pumps that fresh clot straight into the systemic

00:06:30.670 --> 00:06:33.670
circulation. Bam! Instant occlusion in the brain.

00:06:34.189 --> 00:06:35.949
Before we get into the whole cascade of what

00:06:35.949 --> 00:06:38.310
happens when that clot hits, I really want to

00:06:38.310 --> 00:06:40.490
clarify something that drives me crazy in popular

00:06:40.490 --> 00:06:44.540
media. The term mini stroke. Oh, yeah, that's

00:06:44.540 --> 00:06:46.959
a terrible term. Right. People use it to describe

00:06:46.959 --> 00:06:50.500
a TIA, a transient ischemic attack, and they

00:06:50.500 --> 00:06:52.319
treat it like getting a mild sunburn. They just

00:06:52.319 --> 00:06:55.160
brush it off. Brushing off a TIA is a fatal error.

00:06:55.500 --> 00:06:58.199
A TIA is not a mini -stroke. It is the ultimate

00:06:58.199 --> 00:07:00.920
warning shot. So what's actually happening physiologically?

00:07:01.139 --> 00:07:03.620
Well, the occlusion occurs, the downstream tissue

00:07:03.620 --> 00:07:06.079
becomes profoundly ischemic, and the patient

00:07:06.079 --> 00:07:08.879
develops obvious neurological deficits, slurred

00:07:08.879 --> 00:07:11.360
speech, unilateral weakness. But then it goes

00:07:11.360 --> 00:07:14.240
away. Yeah, either through intrinsic clot dissolving

00:07:14.240 --> 00:07:17.620
mechanisms or a shift in collateral flow, the

00:07:17.620 --> 00:07:19.839
blockage clears before that five minute threshold

00:07:19.839 --> 00:07:22.060
of infraction is reached. So the symptoms resolve

00:07:22.060 --> 00:07:25.160
completely, usually in under an hour. So the

00:07:25.160 --> 00:07:28.259
ischemia happens, but the actual tissue death

00:07:28.259 --> 00:07:31.600
doesn't. Correct. But here is the critical intensivist

00:07:31.600 --> 00:07:34.550
thinking. you have absolutely no way of knowing

00:07:34.550 --> 00:07:36.850
if that temporary clot was an isolated event

00:07:36.850 --> 00:07:39.589
or if it was just the opening act for a massive

00:07:39.589 --> 00:07:41.970
catastrophic occlusion that's coming later today.

00:07:42.389 --> 00:07:44.490
Which is why we don't just send them home from

00:07:44.490 --> 00:07:46.430
the ER with a pat on the back. We admit them

00:07:46.430 --> 00:07:49.310
and run the ABCD2 score. Can you explain the

00:07:49.310 --> 00:07:51.430
mechanics of that score? Like why do these specific

00:07:51.430 --> 00:07:54.769
factors matter? So the ABCD2 score predicts the

00:07:54.769 --> 00:07:57.029
exact risk of a patient having a full -blown

00:07:57.029 --> 00:07:59.490
stroke within the next 48 hours. Okay, so what

00:07:59.490 --> 00:08:01.819
does it look at? It looks at age over 60 because

00:08:01.819 --> 00:08:04.420
vascular compliance drops with age, blood pressure

00:08:04.420 --> 00:08:07.000
over 14 and 90 because hypertension creates the

00:08:07.000 --> 00:08:09.300
sheer stress that ruptures plaques. Got it. What

00:08:09.300 --> 00:08:11.860
about the C? Clinical features, specifically

00:08:11.860 --> 00:08:14.959
unilateral weakness or isolated speech impairment,

00:08:15.339 --> 00:08:18.079
because these indicate major vascular territories

00:08:18.079 --> 00:08:20.899
are threatened. Then duration of symptoms, the

00:08:20.899 --> 00:08:23.639
longer the TIA lasts, the closer they were to

00:08:23.639 --> 00:08:25.800
permanent infarction. And the D is diabetes.

00:08:25.980 --> 00:08:28.720
Yep, diabetes. Why is diabetes specifically singled

00:08:28.720 --> 00:08:32.000
out there? Because Chronic hyperglycemia just

00:08:32.000 --> 00:08:35.500
destroys the microvasculature. It impairs the

00:08:35.500 --> 00:08:38.100
very collateral vessels the brain relies on to

00:08:38.100 --> 00:08:40.940
survive an occlusion. Oh, wow. Right. So if a

00:08:40.940 --> 00:08:43.840
diabetic patient has a TIA, their backup system

00:08:43.840 --> 00:08:46.639
is already compromised. If they score high on

00:08:46.639 --> 00:08:49.159
the ABCD2, they are getting admitted to the stroke

00:08:49.159 --> 00:08:51.360
unit for aggressive monitoring. You mentioned

00:08:51.360 --> 00:08:53.970
blood pressure as a scoring metric. And it is

00:08:53.970 --> 00:08:56.570
the single most important modifiable risk factor

00:08:56.570 --> 00:08:59.169
for strokes across the board. Like if you aggressively

00:08:59.169 --> 00:09:01.950
manage hypertension, you can slash stroke risk

00:09:01.950 --> 00:09:05.029
by up to 50%. It's massive. But this isn't distributed

00:09:05.029 --> 00:09:07.370
evenly across the population, is it? Not even

00:09:07.370 --> 00:09:10.470
close. You really have to view stroke pathology

00:09:10.470 --> 00:09:13.759
through the lens of health equity. Black populations

00:09:13.759 --> 00:09:16.279
in the United States have twice the incidence

00:09:16.279 --> 00:09:18.460
of first -time strokes compared to any other

00:09:18.460 --> 00:09:20.779
demographic. Twice the incidence. And they suffer

00:09:20.779 --> 00:09:23.100
double the mortality rate. This isn't some arbitrary

00:09:23.100 --> 00:09:26.000
genetic lottery, you know. It is intrinsically

00:09:26.000 --> 00:09:29.000
linked to systemic disparities in health care

00:09:29.000 --> 00:09:32.240
access, chronic stress loads, and the resulting

00:09:32.240 --> 00:09:34.720
disproportionate rates of uncontrolled hypertension

00:09:34.720 --> 00:09:37.340
and diabetes. So when the system fails to manage

00:09:37.340 --> 00:09:39.419
blood pressure at the primary care level, The

00:09:39.419 --> 00:09:42.740
ICU inherits the catastrophic result. Exactly.

00:09:43.279 --> 00:09:45.919
OK, let's step into the ICU. The patient has

00:09:45.919 --> 00:09:49.000
arrived. The trigger has occurred. The middle

00:09:49.000 --> 00:09:50.659
cerebral artery is blocked. We know the window

00:09:50.659 --> 00:09:53.200
is five minutes. What is actually happening at

00:09:53.200 --> 00:09:55.700
the cellular level during that countdown? Because

00:09:55.700 --> 00:09:57.940
the brain isn't just passively waiting to die,

00:09:58.039 --> 00:10:00.519
right? No, it is fighting violently to survive.

00:10:01.019 --> 00:10:03.559
The immediate physiologic change is ischemia,

00:10:03.779 --> 00:10:06.220
the sudden loss of oxygen and glucose. And without

00:10:06.220 --> 00:10:09.480
oxygen. Without oxygen, the neurons cannot produce

00:10:09.480 --> 00:10:13.179
ATP, cellular energy. Without ATP, the sodium

00:10:13.179 --> 00:10:15.700
-potassium pumps on the cell membrane instantly

00:10:15.700 --> 00:10:18.419
fail. And those pumps are what keep the electrical

00:10:18.419 --> 00:10:21.139
balance of the cell. Exactly. When they fail,

00:10:21.639 --> 00:10:24.200
sodium rushes into the cell. Water always follows

00:10:24.200 --> 00:10:26.580
sodium, right? So the neuron begins to swell

00:10:26.580 --> 00:10:29.549
massively. Okay, so the cells are swelling. And

00:10:29.549 --> 00:10:31.909
simultaneously, calcium floods into the cell,

00:10:32.169 --> 00:10:34.529
which triggers a massive release of glutamate.

00:10:34.750 --> 00:10:36.809
That's an excitatory neurotransmitter. Which

00:10:36.809 --> 00:10:40.070
causes excitotoxicity. Yes. The neurons literally

00:10:40.070 --> 00:10:43.250
fire themselves to death. Man. So while the cells

00:10:43.250 --> 00:10:46.470
are swelling and firing, what is the macrovascular

00:10:46.470 --> 00:10:48.710
system doing to try and help? It's attempting

00:10:48.710 --> 00:10:52.159
rescue. Cerebral autoregulation kicks into overdrive.

00:10:52.460 --> 00:10:54.899
The blood vessels downstream of the clot dilate

00:10:54.899 --> 00:10:57.320
to their absolute maximum diameter, dropping

00:10:57.320 --> 00:10:59.779
vascular resistance to near zero. Desperately

00:10:59.779 --> 00:11:01.940
trying to siphon any available blood from the

00:11:01.940 --> 00:11:03.639
collateral pathways of the circle of Willis.

00:11:03.759 --> 00:11:06.299
Right. But if the primary clot is large enough

00:11:06.299 --> 00:11:10.159
and it doesn't move, compensation fails. Decompensation

00:11:10.159 --> 00:11:12.480
takes over. And what does decompensation look

00:11:12.480 --> 00:11:14.879
like? The collateral flow just isn't enough.

00:11:15.379 --> 00:11:19.179
The swollen neurons burst. That cell death necrosis

00:11:19.179 --> 00:11:22.379
triggers a massive local inflammatory response.

00:11:22.940 --> 00:11:25.919
White blood cells rush in, the blood brain barrier

00:11:25.919 --> 00:11:29.179
breaks down, and fluid leaks directly into the

00:11:29.179 --> 00:11:32.159
brain tissue. This is cerebral edema. Exactly.

00:11:32.620 --> 00:11:35.940
The brain is now swelling inside a rigid, unforgiving

00:11:35.940 --> 00:11:39.799
skull. So as the nurse at the bedside, how does

00:11:39.799 --> 00:11:43.279
that cellular explosion... translate into clinical

00:11:43.279 --> 00:11:45.759
findings. What are you actually seeing? Well,

00:11:45.940 --> 00:11:48.840
the most immediate sign is contralateral motor

00:11:48.840 --> 00:11:51.360
deficits. Meaning the opposite side. Right. If

00:11:51.360 --> 00:11:53.700
the massive clot is in the right hemisphere of

00:11:53.700 --> 00:11:56.500
the brain, you're going to see paralysis or profound

00:11:56.500 --> 00:11:58.639
weakness on the left side of the patient's body.

00:11:59.000 --> 00:12:00.639
Let's lock down the anatomy on that really quick.

00:12:00.860 --> 00:12:03.220
Why contralateral? Why doesn't right brain damage

00:12:03.220 --> 00:12:05.309
just affect the right side of the body? It all

00:12:05.309 --> 00:12:07.690
comes down to the pyramidal pathway, the primary

00:12:07.690 --> 00:12:10.649
motor tract. The nerve fibers that control voluntary

00:12:10.649 --> 00:12:12.789
movement originate in the motor cortex of the

00:12:12.789 --> 00:12:14.769
brain. They travel straight down through the

00:12:14.769 --> 00:12:16.929
internal capsule and into the brainstem. OK,

00:12:17.169 --> 00:12:19.090
following you so far. Oh, but right at the bottom

00:12:19.090 --> 00:12:22.059
of the brainstem, in the medulla oblongata. The

00:12:22.059 --> 00:12:24.399
fibers decussate. They physically cross over.

00:12:24.519 --> 00:12:26.399
Yes, they cross over to the opposite side of

00:12:26.399 --> 00:12:29.019
the spinal cord. So a lesion in the right hemisphere

00:12:29.019 --> 00:12:31.779
cuts the signal before it crosses, manifesting

00:12:31.779 --> 00:12:33.980
as a deficit on the left side of the body. So

00:12:33.980 --> 00:12:36.480
you see the classic hemiparesis, the facial droop,

00:12:36.580 --> 00:12:39.320
and if the dominant hemisphere is hit, the sudden

00:12:39.320 --> 00:12:42.240
loss of speech. Exactly, which is the FAST assessment,

00:12:42.460 --> 00:12:45.220
you know, face drooping, arm weakness, speech

00:12:45.220 --> 00:12:48.179
difficulties, time to call a code stroke. But

00:12:48.179 --> 00:12:50.360
FAST is really for the general public and the

00:12:50.360 --> 00:12:53.720
triage desk. In the ICU, your focused assessment

00:12:53.720 --> 00:12:57.940
is the NIH Stroke Scale, the NIHSS. The NIHSS

00:12:57.940 --> 00:13:00.480
is your primary diagnostic tool at the bedside.

00:13:00.980 --> 00:13:04.279
It is a highly specific 15 -item neurological

00:13:04.279 --> 00:13:07.679
exam, scoring the patient from 0 to 42. And higher

00:13:07.679 --> 00:13:10.779
is worse. What exactly is it assessing? It assesses

00:13:10.779 --> 00:13:13.460
level of consciousness, gaze, visual fields,

00:13:13.720 --> 00:13:15.899
facial palsy, motor function in all four limbs,

00:13:16.360 --> 00:13:19.340
ataxia, sensory loss, language, dysarthria, and

00:13:19.340 --> 00:13:21.700
inattention or neglect. Why is this specific

00:13:21.700 --> 00:13:24.159
scale so critical? Like, why not just use a standard

00:13:24.159 --> 00:13:26.940
Glasgow Coma Scale? Because a GCS just tells

00:13:26.940 --> 00:13:30.340
you if they're awake. The NIHSS tells you exactly

00:13:30.340 --> 00:13:32.740
what vascular territory is dying. Oh, that makes

00:13:32.740 --> 00:13:35.220
sense. Yeah. If their gaze is forced to the left

00:13:35.220 --> 00:13:38.360
and they have right -sided weakness, the NIHSS

00:13:38.360 --> 00:13:40.659
score immediately tells the intensivist that

00:13:40.659 --> 00:13:44.059
the left middle cerebral artery is likely occluded.

00:13:44.340 --> 00:13:47.220
And it gives you a baseline. Yes. Getting an

00:13:47.220 --> 00:13:50.460
accurate baseline NIHSS the exact minute they

00:13:50.460 --> 00:13:52.919
hit the stretcher is the only way you can evaluate

00:13:52.919 --> 00:13:55.220
if your interventions are working. If they come

00:13:55.220 --> 00:13:58.080
in as an 18 and two hours later they are 22,

00:13:58.659 --> 00:14:00.759
your treatment has failed and the stroke is expanding.

00:14:01.419 --> 00:14:03.000
Speaking of things expanding, I want to talk

00:14:03.000 --> 00:14:06.960
about level of consciousness, or LOC, because

00:14:06.960 --> 00:14:10.320
in a pure ischemic stroke, the patient is usually

00:14:10.320 --> 00:14:13.100
wide awake. I mean, they might be paralyzed on

00:14:13.100 --> 00:14:14.960
one side and unable to speak, but their eyes

00:14:14.960 --> 00:14:18.320
are open. Yes, initially. Unless the clot directly

00:14:18.320 --> 00:14:20.419
hits the brain stem, which controls wakefulness,

00:14:20.960 --> 00:14:23.120
a cortical ischemic stroke does not immediately

00:14:23.120 --> 00:14:25.080
drop the level of consciousness. And this is

00:14:25.080 --> 00:14:27.159
a massive bedside trap for nurses, isn't it?

00:14:27.539 --> 00:14:31.240
Huge trap. Never, ever assume a neuro patient

00:14:31.240 --> 00:14:35.019
is just tired or sleeping it off. If a patient

00:14:35.019 --> 00:14:37.679
with an ischemic stroke starts becoming lethargic,

00:14:38.019 --> 00:14:41.840
difficult to rouse, or drops their GCS 24 to

00:14:41.840 --> 00:14:44.840
72 hours after admission, it is a four alarm

00:14:44.840 --> 00:14:47.120
fire. Because that means the cerebral edema we

00:14:47.120 --> 00:14:49.919
talked about has peaked. Exactly. The brain tissue

00:14:49.919 --> 00:14:52.600
has swollen so much that it has literally run

00:14:52.600 --> 00:14:55.220
out of room in the skull. The intracranial pressure

00:14:55.220 --> 00:14:57.740
is rising rapidly and the swelling hemisphere

00:14:57.740 --> 00:15:00.360
is physically pushing across the midline and

00:15:00.360 --> 00:15:02.799
pressing down on the brainstem. A driving LOC

00:15:02.799 --> 00:15:05.059
means the brain is beginning to herniate. It's

00:15:05.059 --> 00:15:07.220
herniating, yes. Okay, let's back up to the moment

00:15:07.220 --> 00:15:10.720
they arrive. We have a suspected ischemic stroke.

00:15:11.039 --> 00:15:14.200
We need diagnostics. The absolute highest yield

00:15:14.200 --> 00:15:16.639
test, the one that takes precedence over everything

00:15:16.639 --> 00:15:19.940
else, is a non -contrast CT of the head. Always

00:15:19.940 --> 00:15:22.399
first. And I have to push back here because this

00:15:22.399 --> 00:15:24.220
seems totally counterintuitive to a lot of people.

00:15:24.419 --> 00:15:26.820
If we are hunting for a clot, a blockage inside

00:15:26.820 --> 00:15:29.279
a vessel, wouldn't we want to inject IV contrast

00:15:29.279 --> 00:15:31.399
dye to light up the arterial tree and show us

00:15:31.399 --> 00:15:33.600
exactly where the blockage is? That is the most

00:15:33.600 --> 00:15:36.480
common logical fallacy novice clinicians make.

00:15:36.980 --> 00:15:39.259
When that patient first hits the scanner, our

00:15:39.259 --> 00:15:42.120
primary goal is not to find the clot. It's not.

00:15:42.179 --> 00:15:45.360
No. Our singular life or death goal is to find

00:15:45.360 --> 00:15:48.919
blood. We must unequivocally rule out a hemorrhagic

00:15:48.919 --> 00:15:51.799
stroke. Because contrast dye on a CT scan looks

00:15:51.799 --> 00:15:55.039
bright white. And blood on a CT scan also looks

00:15:55.039 --> 00:15:57.440
bright white. Exactly. Their radiodensities are

00:15:57.440 --> 00:16:00.340
nearly identical. If you push IV contrast and

00:16:00.340 --> 00:16:03.039
it leaks into the brain parenchyma, the entire

00:16:03.039 --> 00:16:05.340
scan lights up white. You will have absolutely

00:16:05.340 --> 00:16:07.580
no idea if you are looking at contrast dye or

00:16:07.580 --> 00:16:09.940
an active intracerebral hemorrhage. And why does

00:16:09.940 --> 00:16:12.039
this matter so much? Because the treatment for

00:16:12.039 --> 00:16:14.679
an ischemic stroke is the aggressive administration

00:16:14.679 --> 00:16:17.679
of systemic thrombolytics, massive, powerful

00:16:17.679 --> 00:16:20.259
clot busters. If you administer a thrombolytic

00:16:20.259 --> 00:16:22.700
to a patient who is actively bleeding into their

00:16:22.700 --> 00:16:24.620
brain, they will hemorrhage catastrophically

00:16:24.620 --> 00:16:27.159
and die right in front of you. So a non -contrast

00:16:27.159 --> 00:16:30.480
CT is always, always first. You prove there is

00:16:30.480 --> 00:16:32.679
no blood. Then you can proceed with the ischemic

00:16:32.679 --> 00:16:34.919
pathway. Yes, that makes perfect sense. The non

00:16:34.919 --> 00:16:37.039
-contrast CT is the gatekeeper. What else were

00:16:37.039 --> 00:16:39.360
we checking immediately? A stat finger sticks

00:16:39.360 --> 00:16:42.899
blood glucose. The brain requires a constant

00:16:42.899 --> 00:16:46.440
massive supply of glucose. Severe hypoglycemia

00:16:46.440 --> 00:16:49.879
will cause localized metabolic failure that perfectly

00:16:49.879 --> 00:16:52.679
mimics an acute stroke complete with unilateral

00:16:52.679 --> 00:16:55.559
weakness, aphasia, and facial droop. So you have

00:16:55.559 --> 00:16:57.820
to rule out a blood sugar of 30 before you assume

00:16:57.820 --> 00:17:00.840
it's a clot. Exactly. You also need a baseline

00:17:00.840 --> 00:17:03.759
EKG specifically hunting for atrial fibrillation

00:17:03.759 --> 00:17:06.359
to confirm if this was an embolic event. Let's

00:17:06.359 --> 00:17:08.359
translate this into the bedside workflow. If

00:17:08.359 --> 00:17:10.519
you are assessing this patient, the single most

00:17:10.519 --> 00:17:12.880
critical piece of historical data you must extract

00:17:12.880 --> 00:17:16.259
from the family or EMS is the exact time of symptom

00:17:16.259 --> 00:17:18.339
onset. Or if they woke up with the symptoms,

00:17:18.500 --> 00:17:20.599
the time they were last known well. The time

00:17:20.599 --> 00:17:23.140
of onset is the holy grail. Why is it so rigid?

00:17:23.390 --> 00:17:25.569
Every single pharmacological intervention we

00:17:25.569 --> 00:17:27.930
have hinges on that precise time stamp. If you

00:17:27.930 --> 00:17:29.750
don't know when it started, your hands are tied.

00:17:30.109 --> 00:17:32.589
So your primary nursing diagnosis, though we

00:17:32.589 --> 00:17:35.170
don't say it aloud at the bedside, is ineffective

00:17:35.170 --> 00:17:37.750
cerebral tissue perfusion. And your planning

00:17:37.750 --> 00:17:40.509
goal is aggressive. Door to needle time under

00:17:40.509 --> 00:17:43.309
60 minutes. From the second the ambulance wheels

00:17:43.309 --> 00:17:45.369
cross the threshold of the emergency department

00:17:45.369 --> 00:17:48.430
to the exact second the clot -busting drug enters

00:17:48.430 --> 00:17:51.349
their vein, you have one hour. That includes

00:17:51.349 --> 00:17:55.009
the physician assessment, the NIHSS, the CT scan,

00:17:55.410 --> 00:17:57.990
the lab results, and mixing the drug. It requires

00:17:57.990 --> 00:18:00.309
a perfectly choreographed team. So let's talk

00:18:00.309 --> 00:18:02.410
about the priority sequence of nursing actions.

00:18:03.349 --> 00:18:05.950
Rank the interventions. Imagine standing at the

00:18:05.950 --> 00:18:08.730
bedside. First priority, airway and breathing.

00:18:09.049 --> 00:18:13.269
Ensure their oxygen saturation is over 95%. Do

00:18:13.269 --> 00:18:15.589
not hyperoxygenate them if they don't need it,

00:18:15.869 --> 00:18:18.509
as excess oxygen can generate free radicals in

00:18:18.509 --> 00:18:21.490
ischemic tissue, but prevent hypoxia at all costs.

00:18:21.750 --> 00:18:24.160
And keep them MTO, right? Crucially, keep the

00:18:24.160 --> 00:18:26.940
patient strictly NPO, nothing by mouth. Their

00:18:26.940 --> 00:18:29.180
bulbar muscles, the ones controlling swallowing,

00:18:29.299 --> 00:18:31.740
and the gag reflex are likely compromised. If

00:18:31.740 --> 00:18:33.960
you give them a sip of water or an oral medication,

00:18:34.279 --> 00:18:36.140
they will aspirate it straight into their lungs.

00:18:36.420 --> 00:18:38.559
Aspiration pneumonia is the most common preventable

00:18:38.559 --> 00:18:40.759
complication in stroke care. Yes, it happens

00:18:40.759 --> 00:18:43.809
way too often. Next priority. the stat non -contrast

00:18:43.809 --> 00:18:46.890
CT and the blood glucose check. While they are

00:18:46.890 --> 00:18:48.869
rolling to the scanner, you are establishing

00:18:48.869 --> 00:18:51.789
at least two large -bore IVs. You need reliable

00:18:51.789 --> 00:18:54.509
access. Then what? Then you determine eligibility

00:18:54.509 --> 00:18:58.990
for our heavy artillery. TPA, tissue plasminogen

00:18:58.990 --> 00:19:02.329
activator, also known as alteplase. Walk me through

00:19:02.329 --> 00:19:05.029
the mechanism of TPA. How does it actually clear

00:19:05.029 --> 00:19:08.990
the pipe? It is a profound fibrinolytic. A blood

00:19:08.990 --> 00:19:11.289
clot is held together by a sturdy mesh of protein

00:19:11.289 --> 00:19:14.500
called fibrin. TPA's mechanism of action is to

00:19:14.500 --> 00:19:17.039
bind directly to that fibrin mesh and convert

00:19:17.039 --> 00:19:19.460
a circulating protein called plasminogen into

00:19:19.460 --> 00:19:22.519
its active form, plasmin. And plasmin does what?

00:19:23.140 --> 00:19:25.279
Plasmin is an aggressive enzyme that essentially

00:19:25.279 --> 00:19:27.960
acts like molecular scissors. It chops up the

00:19:27.960 --> 00:19:30.420
fibrin cross -links, literally dissolving the

00:19:30.420 --> 00:19:32.279
architectural structure of the clot and restoring

00:19:32.279 --> 00:19:34.819
blood flow to the starving penumbra. But it comes

00:19:34.819 --> 00:19:37.059
with a massive dangerous catch. What are the

00:19:37.059 --> 00:19:39.710
strict contraindications for TPA? Well, the time

00:19:39.710 --> 00:19:42.210
window is absolute. It must be administered within

00:19:42.210 --> 00:19:44.650
three to four and a half hours of the exact symptom

00:19:44.650 --> 00:19:47.369
onset. Why that specific cutoff? What happens

00:19:47.369 --> 00:19:50.650
at hour five? By hour five, the ischemia has

00:19:50.650 --> 00:19:53.569
progressed to irreversible infarction. The brain

00:19:53.569 --> 00:19:56.829
tissue is dead. And more importantly, the endothelial

00:19:56.829 --> 00:19:58.930
walls of the blood vessel supplying that dead

00:19:58.930 --> 00:20:02.470
tissue has become profoundly weak, necrotic and

00:20:02.470 --> 00:20:05.130
friable. So if you blast them with TPA. If you

00:20:05.130 --> 00:20:07.710
administer TPA at hour five, you dissolve the

00:20:07.710 --> 00:20:10.849
clot, and suddenly a massive surge of high -pressure

00:20:10.849 --> 00:20:13.730
arterial blood blasts into those dead, fragile

00:20:13.730 --> 00:20:16.230
vessels. They will instantly rupture. You will

00:20:16.230 --> 00:20:19.309
turn a localized ischemic stroke into a massive,

00:20:19.650 --> 00:20:21.690
uncontrolled hemorrhagic conversion. Exactly.

00:20:22.009 --> 00:20:24.009
It's devastating. What are the other red lights

00:20:24.009 --> 00:20:26.430
for TPA? Any history that suggests an act of

00:20:26.430 --> 00:20:29.960
a recent bleeding risk. A recent GI bleed. major

00:20:29.960 --> 00:20:32.140
surgery or severe head trauma within the last

00:20:32.140 --> 00:20:35.579
14 days, a history of any prior hemorrhagic stroke,

00:20:35.839 --> 00:20:38.140
or current use of strong anticoagulants with

00:20:38.140 --> 00:20:40.579
elevated clotting times. And the vital sign monitoring

00:20:40.579 --> 00:20:43.259
for TPA is arguably the most stressful part of

00:20:43.259 --> 00:20:46.160
the ICU nurse's job, specifically the blood pressure

00:20:46.160 --> 00:20:49.980
parameters. It is a high -wire act. Before you

00:20:49.980 --> 00:20:52.640
even push the bolus of TPA, the patient's blood

00:20:52.640 --> 00:20:55.339
pressure must be strictly lowered to less than

00:20:55.339 --> 00:21:00.319
185 over 110. If it is 186, you cannot push the

00:21:00.319 --> 00:21:02.740
drug. And after? During the infusion and for

00:21:02.740 --> 00:21:05.880
24 solid hours afterward, you must maintain the

00:21:05.880 --> 00:21:09.240
blood pressure below 180 over 105. Why so strict?

00:21:09.400 --> 00:21:12.619
Because TPA systemicizes. It thins the blood

00:21:12.619 --> 00:21:14.920
everywhere. If the systemic pressure is too high,

00:21:15.180 --> 00:21:17.259
it will blow out the capillary beds in the brain

00:21:17.259 --> 00:21:19.130
and cause a hemorrhage. How do you keep it down?

00:21:19.430 --> 00:21:22.130
We manage this using rapid -acting, titratable

00:21:22.130 --> 00:21:25.230
IV antihypertensives, usually a libidolol or

00:21:25.230 --> 00:21:27.609
a nicardipine drip. You are adjusting the drip

00:21:27.609 --> 00:21:30.130
minute by minute, responding to the arterial

00:21:30.130 --> 00:21:32.250
line, keeping them right in that safe zone. Now,

00:21:32.250 --> 00:21:34.329
what about the most famous cardiac drug in the

00:21:34.329 --> 00:21:36.589
world? Everyone knows that if you are having

00:21:36.589 --> 00:21:38.849
a heart attack, you chew an aspirin immediately.

00:21:39.069 --> 00:21:41.789
If a brain attack is the same mechanism, shouldn't

00:21:41.789 --> 00:21:43.730
I load them up with aspirin the second they hit

00:21:43.730 --> 00:21:46.670
the door? Absolutely not. This is a classic exam

00:21:46.670 --> 00:21:49.910
trap and a fatal bedside error. Yes. If the patient

00:21:49.910 --> 00:21:52.250
is a candidate for TPA, you never give aspirin

00:21:52.250 --> 00:21:55.609
right away. You must wait a full 24 to 48 hours

00:21:55.609 --> 00:21:58.609
after the TPA infusion is complete and usually

00:21:58.609 --> 00:22:00.869
after a follow -up CT scan confirms there is

00:22:00.869 --> 00:22:03.430
no bleeding. Because if you mix them, if you

00:22:03.430 --> 00:22:06.589
stack TPA and aspirin on day one, the synergistic

00:22:06.589 --> 00:22:09.269
antiplatelet and fibrinolytic effects will almost

00:22:09.269 --> 00:22:12.109
guarantee a fatal intracranial hemorrhage. OK.

00:22:12.390 --> 00:22:14.849
So what if they wake up with the stroke? So the

00:22:14.849 --> 00:22:17.730
time of onset is unknown, meaning TPA is off

00:22:17.730 --> 00:22:20.710
the table. Or what if the clot is just too massive

00:22:20.710 --> 00:22:22.829
for the drug to dissolve? Are they just out of

00:22:22.829 --> 00:22:25.490
luck? No, the technology has advanced incredibly.

00:22:25.589 --> 00:22:28.369
You move to endovascular stent retrievers or

00:22:28.369 --> 00:22:30.549
mechanical thrombectomy. This is interventional

00:22:30.549 --> 00:22:32.930
radiology, right? Yes, at its finest. The physician

00:22:32.930 --> 00:22:35.369
enters through the femoral artery in the groin

00:22:35.369 --> 00:22:37.950
or, increasingly, the radial artery in the wrist.

00:22:38.569 --> 00:22:41.009
They thread a microcatheter all the way up through

00:22:41.009 --> 00:22:43.730
the aorta, up the carotid, and directly into

00:22:43.730 --> 00:22:46.450
the occluded cerebral artery. And then what?

00:22:46.680 --> 00:22:49.220
They deploy a tiny self -expanding wire mesh

00:22:49.220 --> 00:22:51.559
net inside the clot to capture it, and then they

00:22:51.559 --> 00:22:53.779
physically pull the entire clot out of the brain.

00:22:54.059 --> 00:22:56.059
That is incredible. It is stunning to watch,

00:22:56.180 --> 00:22:58.779
and depending on perfusion imaging, it can sometimes

00:22:58.779 --> 00:23:01.759
be performed up to 24 hours after symptom onset

00:23:01.759 --> 00:23:04.000
in highly selected patients. I want to pivot

00:23:04.000 --> 00:23:06.160
to hemodynamics because this is where the true

00:23:06.160 --> 00:23:09.319
intensivist thinking shines. We need to talk

00:23:09.319 --> 00:23:12.460
about carbon dioxide. Why does the ventilator

00:23:12.460 --> 00:23:14.960
setting or the patient's respiratory rate matter

00:23:14.960 --> 00:23:18.230
to their brain? because CO2 is a remarkably potent

00:23:18.230 --> 00:23:21.130
cerebral vasodilator. So it opens the vessels?

00:23:21.349 --> 00:23:24.589
Yes. If a patient's respiratory drive is depressed,

00:23:24.990 --> 00:23:26.849
say they are lethargic from the stroke, they

00:23:26.849 --> 00:23:30.549
won't blow off enough CO2. As Ca2 accumulates

00:23:30.549 --> 00:23:32.930
in the blood, it signals the cerebral blood vessels

00:23:32.930 --> 00:23:36.369
to dilate widely. This massively increases the

00:23:36.369 --> 00:23:38.730
sheer volume of blood inside the skull. And since

00:23:38.730 --> 00:23:41.450
the skull is a closed box? The intracranial pressure

00:23:41.450 --> 00:23:43.990
spikes. In a brain that is already developing

00:23:43.990 --> 00:23:46.690
cerebral edema from an ischemic stroke, a high

00:23:46.690 --> 00:23:49.470
CO2 can push the ICP to lethal levels and trigger

00:23:49.470 --> 00:23:51.609
herniation. You must ensure they are ventilating

00:23:51.609 --> 00:23:54.250
adequately to keep their CO2 in a normal or even

00:23:54.250 --> 00:23:56.589
slightly low range. Alright, here's a concept

00:23:56.589 --> 00:23:59.190
that I want to push back on heavily. Permissive

00:23:59.190 --> 00:24:02.450
hypertension. We just spent 10 minutes establishing

00:24:02.450 --> 00:24:04.750
that high blood pressure causes the endothelial

00:24:04.750 --> 00:24:07.049
damage that leads to strokes and that we have

00:24:07.049 --> 00:24:10.150
to aggressively drop the pressure below 185 to

00:24:10.150 --> 00:24:13.799
give TPA. But the literature dictates that if

00:24:13.799 --> 00:24:16.579
the patient is not a candidate for TPA and they

00:24:16.579 --> 00:24:18.680
are not getting an intervention, we just let

00:24:18.680 --> 00:24:20.619
their blood pressure rise, sometimes up to 220

00:24:20.619 --> 00:24:24.900
over 120. How does that not violate every basic

00:24:24.900 --> 00:24:27.920
rule of cardiovascular medicine? Why would you

00:24:27.920 --> 00:24:30.599
purposefully let a stroke patient sit with a

00:24:30.599 --> 00:24:33.900
blood pressure of 210? Because it is a desperate,

00:24:34.259 --> 00:24:37.140
brilliant physiological defense mechanism. You

00:24:37.140 --> 00:24:39.180
have to understand the anatomy of the stroke.

00:24:39.319 --> 00:24:41.420
Okay, walk me through it. The area of the brain

00:24:41.420 --> 00:24:43.920
directly supplied by the blocked artery is the

00:24:43.920 --> 00:24:47.079
core. It is dead. It is unsolvable. But surrounding

00:24:47.079 --> 00:24:49.500
that dead core is a halo of tissue called the

00:24:49.500 --> 00:24:51.940
penumbra. And the penumbra is? The penumbra is

00:24:51.940 --> 00:24:54.680
ischemic. It is electrically silent. It is starving.

00:24:55.099 --> 00:24:57.799
But it is still structurally intact and alive.

00:24:57.920 --> 00:24:59.700
Because it's getting that trickle of blood from

00:24:59.700 --> 00:25:01.539
the collateral vessels we talked about earlier.

00:25:01.869 --> 00:25:04.809
Exactly. But remember, those collateral vessels

00:25:04.809 --> 00:25:07.609
are tiny alternative routes. They have incredibly

00:25:07.609 --> 00:25:12.210
high vascular resistance. How does the body force

00:25:12.210 --> 00:25:14.730
blood through a tiny, high -resistance collateral

00:25:14.730 --> 00:25:17.490
network to save the dying penumbra? It ramps

00:25:17.490 --> 00:25:19.630
up the pressure. It ramps up the systemic pump.

00:25:19.910 --> 00:25:22.769
It jacks the blood pressure up to 210 to physically

00:25:22.769 --> 00:25:25.430
force perfusion into that starving tissue. Oh,

00:25:25.430 --> 00:25:28.509
wow. If you, as the clinician, blindly look at

00:25:28.509 --> 00:25:31.710
the monitor, panic at the number 210, and push

00:25:31.710 --> 00:25:34.369
IV labetilol to normalize their pressure to 120

00:25:34.369 --> 00:25:37.609
over 80, you completely remove the driving pressure.

00:25:37.839 --> 00:25:40.539
You will instantly starve the penumbra, actively

00:25:40.539 --> 00:25:43.220
expand the size of the stroke, and permanently

00:25:43.220 --> 00:25:45.400
worsen the patient's paralysis. So you just let

00:25:45.400 --> 00:25:48.539
it ride? So unless the pressure exceeds 220 over

00:25:48.539 --> 00:25:51.240
120, or they have another acute crisis, like

00:25:51.240 --> 00:25:53.619
an aortic dissection, we practice permissive

00:25:53.619 --> 00:25:55.759
hypertension. We permit the high pressure because

00:25:55.759 --> 00:25:57.680
it is the only thing keeping the brain alive.

00:25:57.740 --> 00:25:59.960
That is the essence of critical care, understanding

00:25:59.960 --> 00:26:02.720
the why behind the abnormal vital sign. What

00:26:02.720 --> 00:26:05.339
about 5E fluids? Avoid hypotonic fluids at all

00:26:05.339 --> 00:26:08.490
costs. Never hang D5W. or half normal saline.

00:26:08.509 --> 00:26:10.950
Why not? Hypotonic fluids lower the osmolarity

00:26:10.950 --> 00:26:13.509
of the blood. Because the brain cells are already

00:26:13.509 --> 00:26:16.170
damaged and starving, that free water will rapidly

00:26:16.170 --> 00:26:18.609
cross the blood -brain barrier, pull directly

00:26:18.609 --> 00:26:21.569
into the neurons, and massively exacerbate cerebral

00:26:21.569 --> 00:26:24.890
edema. So what do you use? You stick to isotonic

00:26:24.890 --> 00:26:27.609
normal saline to maintain intravascular volume

00:26:27.609 --> 00:26:30.450
without shifting water into the brain. And you

00:26:30.450 --> 00:26:33.390
must monitor their electrolytes closely, particularly

00:26:33.390 --> 00:26:36.759
for hyponatremia. Because of SIEH? Exactly. Exactly.

00:26:37.259 --> 00:26:40.279
Stroke patients frequently develop SIADH syndrome

00:26:40.279 --> 00:26:43.400
of inappropriate antidiuretic hormone. They retain

00:26:43.400 --> 00:26:45.880
free water, which dilutes their serum sodium,

00:26:46.099 --> 00:26:48.039
further worsening cellular swelling. Let's look

00:26:48.039 --> 00:26:51.420
at deterioration. As the nurse, you were doing

00:26:51.420 --> 00:26:54.680
hourly neuro checks. What is the subtle sign

00:26:54.680 --> 00:26:56.859
that things are going south? The earliest sign

00:26:56.859 --> 00:26:59.200
of deterioration is always, always a change in

00:26:59.200 --> 00:27:01.819
the level of consciousness. Long before the pupil

00:27:01.819 --> 00:27:03.920
blows, the patient will become slightly more

00:27:03.920 --> 00:27:06.200
difficult to arouse. Their responses will slow

00:27:06.200 --> 00:27:08.720
down. They might lose their gag reflex. If you

00:27:08.720 --> 00:27:10.720
see a previously alert patient drifting into

00:27:10.720 --> 00:27:13.420
a stupor, the cerebral edema is expanding and

00:27:13.420 --> 00:27:15.559
compressing the reticular activating system in

00:27:15.559 --> 00:27:18.859
the brainstem. And escalation. When do you call

00:27:18.859 --> 00:27:21.240
the provider versus calling a rapid response?

00:27:21.460 --> 00:27:23.740
You are notifying the provider for trend changes.

00:27:24.250 --> 00:27:26.829
If the blood pressure starts creeping up to 182,

00:27:26.910 --> 00:27:30.630
183 during a TPA infusion, you call to get parameters

00:27:30.630 --> 00:27:33.869
adjusted before it hits 185. And the rapid response.

00:27:34.109 --> 00:27:36.329
You call a rapid response or a full code for

00:27:36.329 --> 00:27:38.970
any acute airway compromise. They lose their

00:27:38.970 --> 00:27:42.170
airway reflexes entirely. Or if you witness a

00:27:42.170 --> 00:27:45.869
sudden precipitous drop in GCS or a sudden pupil

00:27:45.869 --> 00:27:48.450
dilation, which means herniation is actively

00:27:48.450 --> 00:27:50.670
occurring. Let's do a quick differential pattern

00:27:50.670 --> 00:27:54.380
recognition. If you see a sudden onset of symptoms,

00:27:54.960 --> 00:27:57.500
plus severe expressive aphasia, plus a known

00:27:57.500 --> 00:28:00.119
history of atrial fibrillation, you immediately

00:28:00.119 --> 00:28:02.619
suspect an embolic ischemic stroke originating

00:28:02.619 --> 00:28:04.519
from the heart. We talked about the aspirin trap.

00:28:04.660 --> 00:28:06.579
There's another critical care pearl in the outline

00:28:06.579 --> 00:28:08.839
regarding physical rehabilitation in the ICU.

00:28:09.420 --> 00:28:12.059
The footboard trap. Oh, this is a classic board

00:28:12.059 --> 00:28:14.440
exam question and a very common bedside mistake

00:28:14.440 --> 00:28:17.579
made by well -meaning novice nurses. Stroke patients

00:28:17.579 --> 00:28:20.079
with upper motor neuron lesions often develop

00:28:20.079 --> 00:28:23.299
severe spasticity and a condition called foot

00:28:23.299 --> 00:28:25.680
drop where the weakened foot hangs downward.

00:28:26.339 --> 00:28:29.259
The logical instinct is to place a rigid flat

00:28:29.259 --> 00:28:31.500
footboard at the end of the bed to prop the foot

00:28:31.500 --> 00:28:34.079
up at a 90 degree angle and prevent the drop.

00:28:34.200 --> 00:28:37.200
Which seems entirely reasonable to maintain anatomical

00:28:37.200 --> 00:28:40.440
alignment. It does, but anatomically it is exactly

00:28:40.440 --> 00:28:42.859
the wrong move. Because the upper motor neurons

00:28:42.859 --> 00:28:45.640
are damaged, the lower motor reflexes are uninhibited

00:28:45.640 --> 00:28:49.200
and hyperactive. Providing constant hard sensory

00:28:49.200 --> 00:28:51.880
stimulation to the sole of the foot via a footboard

00:28:51.880 --> 00:28:54.720
triggers a continuous positive support reflex.

00:28:55.160 --> 00:28:58.000
So it makes it worse? It chemically and electrically

00:28:58.000 --> 00:29:00.180
commands the calf muscles to push back against

00:29:00.180 --> 00:29:02.980
the board, which dramatically increases plantar

00:29:02.980 --> 00:29:05.259
flexion and spasticity, making the foot drop

00:29:05.259 --> 00:29:07.500
much worse. So what do you do instead? You must

00:29:07.500 --> 00:29:10.559
use soft, high -top tennis shoes or specialized

00:29:10.559 --> 00:29:13.220
floating splints that maintain alignment without

00:29:13.220 --> 00:29:15.559
stimulating the sole of the foot. Okay, let's

00:29:15.559 --> 00:29:18.589
synthesize this. Give me the intensivist thinking

00:29:18.589 --> 00:29:21.029
framework for the ischemic stroke. The primary

00:29:21.029 --> 00:29:24.250
problem is an intravascular clot. The failing

00:29:24.250 --> 00:29:27.490
physiology is downstream tissue ischemia leading

00:29:27.490 --> 00:29:31.190
to cell death and secondary cerebral edema. Immediate

00:29:31.190 --> 00:29:33.539
threat. The immediate threat is permanent loss

00:29:33.539 --> 00:29:36.240
of neurological function and brain stem herniation

00:29:36.240 --> 00:29:38.920
from swelling. And the interventions. The primary

00:29:38.920 --> 00:29:41.740
interventions are systemic TPA, endovascular

00:29:41.740 --> 00:29:44.619
stent retrieval, and strict blood pressure management,

00:29:44.779 --> 00:29:47.140
either restrictive for TPA or permissive for

00:29:47.140 --> 00:29:50.640
salvage. Reassessment requires continuous NIHSS

00:29:50.640 --> 00:29:52.980
scoring and vigilant monitoring of the airway

00:29:52.980 --> 00:29:55.880
and level of consciousness. So if you are that

00:29:55.880 --> 00:29:58.900
ICU nurse and you only remember five things about

00:29:58.900 --> 00:30:02.660
the ischemic pathway, one. The core pathophysiology

00:30:02.660 --> 00:30:05.460
is ischemia leading to irreversible cell death

00:30:05.460 --> 00:30:08.019
within a five -minute window, followed by massive

00:30:08.019 --> 00:30:10.640
cerebral edema. Right. Two, the most critical

00:30:10.640 --> 00:30:12.359
assessment finding is establishing the exact

00:30:12.359 --> 00:30:14.559
time of symptom onset to determine intervention

00:30:14.559 --> 00:30:17.519
eligibility. Crucial. Three, the most dangerous

00:30:17.519 --> 00:30:19.920
complications are hemorrhagic conversion if TPA

00:30:19.920 --> 00:30:23.019
protocols are violated and brain stem herniation

00:30:23.019 --> 00:30:27.319
peaking at 72 hours. Four, your priority in nursing

00:30:27.319 --> 00:30:29.440
actions are securing the airway, maintaining

00:30:29.440 --> 00:30:32.319
strict NPO status to prevent aspiration, and

00:30:32.319 --> 00:30:35.279
rushing the patient for a stat non -contrast

00:30:35.279 --> 00:30:39.059
CT. Yep. And five, the most important treatments

00:30:39.059 --> 00:30:43.099
are TPA within the 4 .5 hour window or mechanical

00:30:43.099 --> 00:30:45.220
thrombectomy. Perfect. Give me the one sentence

00:30:45.220 --> 00:30:47.680
clinical picture. A patient experiences a sudden

00:30:47.680 --> 00:30:50.539
painless onset of unilateral weakness and facial

00:30:50.539 --> 00:30:53.299
droop, often with a history of entrial fibrillation

00:30:53.299 --> 00:30:55.940
or severe atherosclerosis. And your action phrase

00:30:55.940 --> 00:30:58.859
at the bedside. If you see a sudden focal neurological

00:30:58.859 --> 00:31:01.740
deficit, think time is brain, keep the MPO and

00:31:01.740 --> 00:31:04.440
immediately facilitate non -contrast CT and a

00:31:04.440 --> 00:31:06.859
finger stick glucose. complete blueprint for

00:31:06.859 --> 00:31:09.740
the 87%. That is the blocked pipe. But now, we

00:31:09.740 --> 00:31:12.099
have to completely invert our thinking. We have

00:31:12.099 --> 00:31:14.960
to look at the burst pipe. Section two. You get

00:31:14.960 --> 00:31:17.599
the patient to the CT scanner. You run the non

00:31:17.599 --> 00:31:20.440
-contrast scan. The radiologist looks at the

00:31:20.440 --> 00:31:22.660
screen, and instead of dark, normal brain tissue,

00:31:23.079 --> 00:31:26.960
they see a massive, bright, white starburst in

00:31:26.960 --> 00:31:28.740
the center of the brain. Yeah. You are no longer

00:31:28.740 --> 00:31:31.220
dealing with a clot. TPA is off the table. You

00:31:31.220 --> 00:31:33.299
are dealing with a hemorrhagic stroke. And the

00:31:33.299 --> 00:31:36.000
prognosis has just plummeted. Hemorrhagic strokes

00:31:36.000 --> 00:31:39.079
account for only 13 % of all strokes, but they

00:31:39.079 --> 00:31:42.240
are devastating. The 30 -day mortality rate for

00:31:42.240 --> 00:31:44.880
an intracerebral hemorrhage is between 40 and

00:31:44.880 --> 00:31:47.980
80%. It is a catastrophic event. Break down the

00:31:47.980 --> 00:31:49.940
two primary types of bleeds we see. You have

00:31:49.940 --> 00:31:51.680
the intracerebral hemorrhage, which is a bleed

00:31:51.680 --> 00:31:54.160
directly into the deep brain parenchyma, commonly

00:31:54.160 --> 00:31:56.680
the basal ganglia, the thalamus, or the pons.

00:31:56.819 --> 00:31:59.039
What causes that? The absolute number one cause

00:31:59.039 --> 00:32:02.500
of this is uncontrolled, long -standing hypertension.

00:32:03.319 --> 00:32:05.799
Years of high pressure weaken the small penetrating

00:32:05.799 --> 00:32:07.940
arteries until they simply rupture under the

00:32:07.940 --> 00:32:10.019
strain. And the second type? The second type

00:32:10.019 --> 00:32:13.160
is the subarachnoid hemorrhage, or SAH. This

00:32:13.160 --> 00:32:16.019
is bleeding into the cerebrospinal fluid space,

00:32:16.420 --> 00:32:18.559
the subarachnoid space that surrounds the surface

00:32:18.559 --> 00:32:21.460
of the brain. And the culprit for the SAH is

00:32:21.460 --> 00:32:25.180
usually an aneurysm. Specifically, a ruptured

00:32:25.180 --> 00:32:28.680
saccular or bary aneurysm typically located in

00:32:28.680 --> 00:32:31.420
the bifurcations of the circle of Willis. We

00:32:31.420 --> 00:32:34.220
call aneurysms the silent killer because the

00:32:34.220 --> 00:32:37.180
pathophysiology is incredibly slow. They just

00:32:37.180 --> 00:32:39.720
sit there for years. Over decades, the sheer

00:32:39.720 --> 00:32:42.519
stress of arterial blood hitting the fork in

00:32:42.519 --> 00:32:45.359
a blood vessel causes the muscular wall of the

00:32:45.359 --> 00:32:48.200
artery to weaken and balloon outward, forming

00:32:48.200 --> 00:32:51.579
a thin -walled sac. The patient feels absolutely

00:32:51.579 --> 00:32:53.720
nothing. They have no symptoms. Until? Until

00:32:53.720 --> 00:32:56.539
the exact millisecond that the paper -thin wall

00:32:56.539 --> 00:32:59.819
finally gives way and arterial blood blasts into

00:32:59.819 --> 00:33:02.160
the subarachnoid space. So the trigger is the

00:33:02.160 --> 00:33:04.440
rupture. Let's talk about the physiological change

00:33:04.440 --> 00:33:06.059
because we have to talk about the Monroe -Kelley

00:33:06.059 --> 00:33:07.920
Doctrine. The Monroe -Kelley Doctrine is the

00:33:07.920 --> 00:33:10.240
foundational rule of neurocritical care. The

00:33:10.240 --> 00:33:12.819
adult skull is a rigid and flexible bone box.

00:33:12.980 --> 00:33:15.359
Inside this closed box, you have three components.

00:33:15.700 --> 00:33:17.980
Brain tissue, blood, and cerebrospinal fluid.

00:33:18.099 --> 00:33:20.779
And there's no extra room. None. The doctrine

00:33:20.779 --> 00:33:22.859
states that if the volume of any one of these

00:33:22.859 --> 00:33:25.559
components increases, one or both of the others

00:33:25.559 --> 00:33:28.200
must decrease, or the pressure will skyrocket.

00:33:28.759 --> 00:33:31.720
So when an aneurysm bursts, you are violently

00:33:31.720 --> 00:33:34.579
injecting a massive volume of arterial blood

00:33:34.579 --> 00:33:37.740
into a box that has zero capacity to expand.

00:33:38.160 --> 00:33:41.259
Exactly. The physiological change is an instantaneous

00:33:41.259 --> 00:33:45.170
massive spike in intracranial pressure. The compensatory

00:33:45.170 --> 00:33:48.390
mechanism is that the body tries to shunt cerebrospinal

00:33:48.390 --> 00:33:50.369
fluid down into the spinal cord to make room,

00:33:50.690 --> 00:33:53.130
and it tries to decrease cerebral blood volume

00:33:53.130 --> 00:33:55.710
by compressing the venous system. But I'm guessing

00:33:55.710 --> 00:33:58.650
that fails quickly. This compensation is overwhelmed

00:33:58.650 --> 00:34:00.930
almost immediately. What does a decompensation

00:34:00.930 --> 00:34:03.329
look like? Two profoundly destructive things

00:34:03.329 --> 00:34:06.180
happen. First, the physical mass effect. The

00:34:06.180 --> 00:34:08.619
expanding pool of blood acts like a rapidly growing

00:34:08.619 --> 00:34:11.320
tumor. It physically crushes the adjacent healthy

00:34:11.320 --> 00:34:13.760
brain tissue, shifting the midline of the brain

00:34:13.760 --> 00:34:15.980
and eventually forcing the brainstem down through

00:34:15.980 --> 00:34:17.820
the form and magnum. The opening at the base

00:34:17.820 --> 00:34:20.460
of the skull. Right. This is uncle or tonsillar

00:34:20.460 --> 00:34:22.980
herniation, and it results in rapid respiratory

00:34:22.980 --> 00:34:25.460
and cardiac arrest. And the second destructive

00:34:25.460 --> 00:34:28.559
mechanism. This one is specific to the subarachnoid

00:34:28.559 --> 00:34:31.400
space. Yes. And this is where the intensive care

00:34:31.400 --> 00:34:34.400
management gets incredibly complex. When blood

00:34:34.400 --> 00:34:38.019
pools in the subarachnoid space, the red blood

00:34:38.019 --> 00:34:40.860
cells eventually begin to rise to break down.

00:34:41.019 --> 00:34:42.949
And what happens when they break down? As they

00:34:42.949 --> 00:34:45.690
degrade, they release highly toxic inflammatory

00:34:45.690 --> 00:34:48.349
metabolites directly onto the outer surface of

00:34:48.349 --> 00:34:51.650
the cerebral arteries. These toxins severely

00:34:51.650 --> 00:34:53.929
irritate the smooth muscle of the blood vessels,

00:34:54.210 --> 00:34:57.329
causing them to spasm aggressively. This is cerebral

00:34:57.329 --> 00:35:00.969
vasospasm. Yes. The arteries clamp down so tightly

00:35:00.969 --> 00:35:03.769
that they completely cut off blood flow to the

00:35:03.769 --> 00:35:06.369
downstream brain tissue. Wait, so the bleed actually

00:35:06.369 --> 00:35:08.530
causes the blood vessels to constrict so much

00:35:08.530 --> 00:35:11.090
that it causes secondary ischemia. You have a

00:35:11.090 --> 00:35:13.329
hemorrhagic stroke that essentially triggers

00:35:13.329 --> 00:35:15.949
secondary ischemic stroke days later. Exactly.

00:35:16.030 --> 00:35:18.769
It is a devastating one -two punch. The patient

00:35:18.769 --> 00:35:21.230
survives the initial bleeding event only to have

00:35:21.230 --> 00:35:23.670
their brains starved of oxygen a week later because

00:35:23.670 --> 00:35:26.030
the vessels are spasming in reaction to the old

00:35:26.030 --> 00:35:28.750
blood. So clinically, what does that initial

00:35:28.750 --> 00:35:31.489
rupture look like? Ischemic strokes had the FAST

00:35:31.489 --> 00:35:34.550
acronym. What is the classic presentation of

00:35:34.550 --> 00:35:38.150
an SH? It is unmistakable. The patient will experience

00:35:38.150 --> 00:35:40.900
a sudden thunderclap headache. They will often

00:35:40.900 --> 00:35:43.900
describe it literally as the worst headache of

00:35:43.900 --> 00:35:47.539
my life. It hits maximum intensity within seconds.

00:35:47.559 --> 00:35:50.880
I vomit, right. The spike in ICP instantly triggers

00:35:50.880 --> 00:35:54.079
projectile vomiting and a rapid, terrifying decline

00:35:54.079 --> 00:35:56.480
in the level of consciousness as the brainstem

00:35:56.480 --> 00:35:59.579
is compressed. And you also see signs of meningeal

00:35:59.579 --> 00:36:03.260
irritation. Yes. Because blood is highly irritating

00:36:03.260 --> 00:36:05.559
to the meninges, the protective layer surrounding

00:36:05.559 --> 00:36:08.179
the brain and spinal cord, you will see neutral

00:36:08.179 --> 00:36:11.710
rigidity. which is a profoundly stiff neck. The

00:36:11.710 --> 00:36:14.030
patient will forcefully resist any attempt to

00:36:14.030 --> 00:36:16.289
bend their neck forward. They will also experience

00:36:16.289 --> 00:36:19.050
severe photophobia, extreme sensitivity to light.

00:36:19.269 --> 00:36:21.409
What are the late dangerous findings, the ones

00:36:21.409 --> 00:36:24.010
that mean we are losing the patient? If the hemorrhage

00:36:24.010 --> 00:36:26.969
is located in the pons, the central control center

00:36:26.969 --> 00:36:29.550
of the brain stem, the presentation is catastrophic.

00:36:29.949 --> 00:36:32.949
The POMS regulates basic life -sustaining functions.

00:36:33.429 --> 00:36:36.489
A massive pontine hemorrhage wipes out the reticular

00:36:36.489 --> 00:36:39.210
activating system and the autonomic pathways.

00:36:39.510 --> 00:36:41.030
What does that look like on the bed? You will

00:36:41.030 --> 00:36:43.889
see sudden, complete quadriplegia, pupils that

00:36:43.889 --> 00:36:46.389
are pinpoint or completely fixed and dilated,

00:36:46.710 --> 00:36:49.670
hyperthermia where their temperature spikes uncontrollably,

00:36:50.130 --> 00:36:53.429
deep coma, and usually rapid death. Let's talk

00:36:53.429 --> 00:36:56.010
diagnostics. We know the non -contrast CT is

00:36:56.010 --> 00:36:58.760
the gold standard to visualize the blood. But

00:36:58.760 --> 00:37:01.880
the outline brings up a critical scenario. What

00:37:01.880 --> 00:37:03.619
if the patient has the thunderclap headache,

00:37:03.980 --> 00:37:06.480
the stiff neck, all the classic SAH symptoms,

00:37:07.000 --> 00:37:09.380
but the CT scan comes back negative for blood?

00:37:09.639 --> 00:37:12.019
Sometimes tiny microbleeds don't show up on a

00:37:12.019 --> 00:37:14.300
CT immediately. So the next step is traditionally

00:37:14.300 --> 00:37:17.280
a lumbar puncture in LP to draw cerebrospinal

00:37:17.280 --> 00:37:19.920
fluid and check it for red blood cells. But there's

00:37:19.920 --> 00:37:22.400
massive flashing red warning light here. This

00:37:22.400 --> 00:37:24.760
is a scenario where an action can kill a patient

00:37:24.760 --> 00:37:28.159
instantly. You absolutely do not perform a lumbar

00:37:28.159 --> 00:37:30.519
puncture if the patient is demonstrating clinical

00:37:30.519 --> 00:37:33.500
signs of severely elevated intracranial pressure,

00:37:33.940 --> 00:37:37.159
like a deteriorating LOC, unequal pupils, or

00:37:37.159 --> 00:37:39.800
pepaldema on an eye exam. Walk me through the

00:37:39.800 --> 00:37:42.000
physics of why an LP is fatal in that moment.

00:37:42.300 --> 00:37:44.719
Think about the clothes box. The pressure inside

00:37:44.719 --> 00:37:47.420
the skull is overwhelmingly high because of the

00:37:47.420 --> 00:37:50.409
expanding bleed. the brain is already being pushed

00:37:50.409 --> 00:37:53.250
downward toward the foramen magnum. Okay, so

00:37:53.250 --> 00:37:55.789
it's under immense pressure. If you insert a

00:37:55.789 --> 00:37:58.909
needle into the lower lumbar spine and draw out

00:37:58.909 --> 00:38:02.190
cerebrospinal fluid, you suddenly create a localized

00:38:02.190 --> 00:38:04.530
area of very low pressure at the bottom of the

00:38:04.530 --> 00:38:07.210
spinal canal. Fluid dynamics dictate that high

00:38:07.210 --> 00:38:09.570
pressure always moves toward low pressure. Oh

00:38:09.570 --> 00:38:11.889
no. The massive pressure in the skull will take

00:38:11.889 --> 00:38:14.670
the path of least resistance and it will physically

00:38:14.670 --> 00:38:17.170
forcefully suck the brainstem down through the

00:38:17.170 --> 00:38:19.550
base of the skull. into the spinal canal. You

00:38:19.550 --> 00:38:21.869
will cause iatrogenic brain herniation and kill

00:38:21.869 --> 00:38:23.929
the patient on the table. You must always confirm

00:38:23.929 --> 00:38:27.010
the ICP is manageable usually via a negative

00:38:27.010 --> 00:38:30.969
CT before proceeding with an LP. Okay let's translate

00:38:30.969 --> 00:38:34.010
this to the bedside. Priority nursing actions

00:38:34.010 --> 00:38:37.570
for a hemorrhagic stroke. Imagine you were receiving

00:38:37.570 --> 00:38:40.730
this patient from the ER. First priority, secure

00:38:40.730 --> 00:38:43.630
the airway. If they're comatose they have lost

00:38:43.630 --> 00:38:46.920
their gag reflex entirely. Because they are likely

00:38:46.920 --> 00:38:49.599
vomiting from the ICP spike, they will aspirate

00:38:49.599 --> 00:38:51.900
immediately, or their tongue will fall back and

00:38:51.900 --> 00:38:54.840
occlude the airway. You prepare for immediate

00:38:54.840 --> 00:38:57.960
endotracheal intubation. Next priority. Absolute,

00:38:58.119 --> 00:39:00.980
strict blood pressure control. This is the exact

00:39:00.980 --> 00:39:03.400
polar opposite of the ischemic stroke protocol.

00:39:04.199 --> 00:39:06.280
In an ischemic stroke, we allowed permissive

00:39:06.280 --> 00:39:09.099
hypertension to force blood past the clot. But

00:39:09.099 --> 00:39:11.360
in a hemorrhagic stroke, the pipe has burst.

00:39:11.480 --> 00:39:13.559
Right. If you allow the blood pressure to remain

00:39:13.559 --> 00:39:15.880
high, it acts like a pressure washer inside the

00:39:15.880 --> 00:39:18.619
brain parenchyma, violently expanding the hematoma

00:39:18.619 --> 00:39:21.119
and worsening the bleeding. You must initiate

00:39:21.119 --> 00:39:24.079
titratable IV antihypertensives again, labetalol

00:39:24.079 --> 00:39:26.719
or nicardipine, to aggressively keep the systolic

00:39:26.719 --> 00:39:29.619
blood pressure strictly below 160. Then what?

00:39:29.860 --> 00:39:33.019
Optimize venous drainage to lower the ICP. You

00:39:33.019 --> 00:39:35.360
elevate the head of the bed to exactly 30 degrees.

00:39:35.900 --> 00:39:37.820
And crucially, you ensure the patient's head

00:39:37.820 --> 00:39:40.619
is maintained in a perfectly neutral midline

00:39:40.619 --> 00:39:43.420
position. Why does the head position matter so

00:39:43.420 --> 00:39:46.000
much? If the patient's neck is twisted to the

00:39:46.000 --> 00:39:48.559
left or the right, or if it is severely flexed,

00:39:48.800 --> 00:39:51.360
it physically kinks the internal jugular veins

00:39:51.360 --> 00:39:53.480
in the neck. Like stepping on a garden hose?

00:39:53.739 --> 00:39:56.960
Yes. The brain relies on gravity and open jugular

00:39:56.960 --> 00:39:59.380
veins to drain venous blood back to the heart.

00:39:59.639 --> 00:40:01.639
If you kink the drain, the venous blood backs

00:40:01.639 --> 00:40:04.300
up into the skull and the intracranial pressure

00:40:04.300 --> 00:40:07.849
spikes even higher. Head midline. Always. Let's

00:40:07.849 --> 00:40:10.170
discuss medications. We are obviously not giving

00:40:10.170 --> 00:40:13.369
TPA, aspirin, or heparin. What pharmacological

00:40:13.369 --> 00:40:16.250
tools do we actually use? For a superacnoid hemorrhage,

00:40:16.389 --> 00:40:19.130
we utilize a very specific calcium channel blocker

00:40:19.130 --> 00:40:21.820
called nemotapine. What is the exact mechanism?

00:40:22.139 --> 00:40:24.340
Why this specific drug? Remember the delayed

00:40:24.340 --> 00:40:27.619
threat of cerebral vasospasm? Those toxic red

00:40:27.619 --> 00:40:29.719
blood cell metabolites irritating the arteries

00:40:29.719 --> 00:40:32.559
and causing them to clamp down? Nemotapine is

00:40:32.559 --> 00:40:35.159
highly lipid soluble, meaning it crosses the

00:40:35.159 --> 00:40:37.500
blood -brain barrier very efficiently. And what

00:40:37.500 --> 00:40:40.579
does it do once it crosses? It binds to the calcium

00:40:40.579 --> 00:40:42.980
channel specifically in the smooth muscle of

00:40:42.980 --> 00:40:45.340
the cerebral arteries, preventing the influx

00:40:45.340 --> 00:40:48.480
of calcium. Without calcium, the muscle cannot

00:40:48.480 --> 00:40:51.619
contract. It selectively dilates the cerebral

00:40:51.619 --> 00:40:54.320
blood vessels, keeping them open and preventing

00:40:54.320 --> 00:40:57.000
that deadly secondary ischemic infarction. But

00:40:57.000 --> 00:40:59.360
it's a calcium channel blocker, which means it

00:40:59.360 --> 00:41:02.420
will affect systemic hemodynamics. What are the

00:41:02.420 --> 00:41:04.699
hold parameters? Because it causes vasodilation,

00:41:04.860 --> 00:41:07.579
it can drop the systemic blood pressure. As the

00:41:07.579 --> 00:41:09.480
nurse, you must check the vitals right before

00:41:09.480 --> 00:41:12.460
administration. You hold the nematopine and immediately

00:41:12.460 --> 00:41:14.579
notify the provider if the patient's heart rate

00:41:14.579 --> 00:41:17.440
drops below 60, or if their systolic blood pressure

00:41:17.440 --> 00:41:20.179
drops below 90. We manage the pressure. We manage

00:41:20.179 --> 00:41:23.460
the vasospasm. But how do we actually fix the

00:41:23.460 --> 00:41:25.860
physical rupture in the vessel? Through invasive

00:41:25.860 --> 00:41:29.099
procedures, we have two primary surgical avenues,

00:41:29.519 --> 00:41:32.280
clipping or coiling. Surgical clipping requires

00:41:32.280 --> 00:41:35.099
a craniotomy. The neurosurgeon physically removes

00:41:35.099 --> 00:41:37.559
a piece of the skull, navigates through the brain

00:41:37.559 --> 00:41:39.940
tissue to the base of the aneurysm, and places

00:41:39.940 --> 00:41:43.119
a tiny permanent titanium clip directly across

00:41:43.119 --> 00:41:45.420
the neck of the aneurysm. It just pinches it

00:41:45.420 --> 00:41:47.079
off. This pinches it off from the para -artery

00:41:47.079 --> 00:41:49.539
completely. The clip stays in the patient's brain

00:41:49.539 --> 00:41:51.739
for the rest of their life. And endovascular

00:41:51.739 --> 00:41:54.300
coiling. Coiling is much less invasive. It doesn't

00:41:54.300 --> 00:41:57.280
require opening the skull. It is an endovascular

00:41:57.280 --> 00:42:00.380
procedure using Guglielmi detachable coils or

00:42:00.380 --> 00:42:04.360
GDC. Similar to the stent retriever, the interventionalist

00:42:04.360 --> 00:42:06.980
threads a microcaptor up from the groin directly

00:42:06.980 --> 00:42:09.599
into the dome of the aneurysm itself. Then they

00:42:09.599 --> 00:42:12.119
put the coils in. They then pack the aneurysm

00:42:12.119 --> 00:42:15.559
sack full of incredibly soft microscopic platinum

00:42:15.559 --> 00:42:19.059
coils. These coils take up physical space and

00:42:19.059 --> 00:42:21.300
severely disrupt the blood flow inside the sack.

00:42:21.960 --> 00:42:24.239
This disruption triggers a massive localized

00:42:24.239 --> 00:42:27.780
clotting cascade. The aneurysm effectively thromboses

00:42:27.780 --> 00:42:30.239
itself solid, sealing it off from the inside.

00:42:30.340 --> 00:42:33.360
So the vessel is secured. But what about the

00:42:33.360 --> 00:42:35.679
excess fluid and blood still trapped in the skull

00:42:35.679 --> 00:42:38.760
causing hydrocephalus and high ICP? The neurosurgeon

00:42:38.760 --> 00:42:41.239
will place an external ventricular drain, or

00:42:41.239 --> 00:42:44.289
an EDD, also known as a ventriculostomy. They

00:42:44.289 --> 00:42:46.809
drill a small burr hole in the skull and pass

00:42:46.809 --> 00:42:49.369
a catheter directly into the lateral ventricles

00:42:49.369 --> 00:42:52.289
of the brain. This allows us to actively drain

00:42:52.289 --> 00:42:55.469
the excess cerebrospinal fluid and blood outward

00:42:55.469 --> 00:42:58.170
into a collection bag, instantly relieving the

00:42:58.170 --> 00:43:00.989
pressure inside the closed box. Okay, here is

00:43:00.989 --> 00:43:03.030
the concept that is going to blow everyone's

00:43:03.030 --> 00:43:06.449
mind. I need to push back hard on this. We are

00:43:06.449 --> 00:43:10.440
talking about hyperdynamic therapy. Wait. We

00:43:10.440 --> 00:43:12.280
just established that chronic high blood pressure

00:43:12.280 --> 00:43:14.360
caused the aneurysm to burst in the first place.

00:43:14.440 --> 00:43:16.179
Right. We just established that the priority

00:43:16.179 --> 00:43:18.880
nursing action upon arrival is to aggressively

00:43:18.880 --> 00:43:21.559
drop the systolic below 160 to prevent rebleeding.

00:43:22.039 --> 00:43:24.300
But the intensive care protocols state that after

00:43:24.300 --> 00:43:27.099
the aneurysm is clipped or coiled, we intentionally

00:43:27.099 --> 00:43:30.380
hang five uvesopressors like dopamine or norepinephrine

00:43:30.380 --> 00:43:32.960
to artificially jack the patient's blood pressure

00:43:32.960 --> 00:43:36.360
way up. Yes, we do. Why on earth are we inducing

00:43:36.360 --> 00:43:38.380
hypertension in a patient who just had a brain

00:43:38.380 --> 00:43:41.269
bleed? because the entire physiological landscape

00:43:41.269 --> 00:43:44.010
has changed. This is peak intensivist reasoning.

00:43:44.849 --> 00:43:47.150
Before the aneurysm is secured, high pressure

00:43:47.150 --> 00:43:49.150
is the enemy because it drives the bleeding.

00:43:49.889 --> 00:43:53.389
But once the clip or the coil is deployed, that

00:43:53.389 --> 00:43:56.070
weak spot is neutralized. The aneurysm is safe.

00:43:56.269 --> 00:43:58.590
So what's the new enemy? The new enemy is the

00:43:58.590 --> 00:44:01.730
delayed cerebral vasospasm, which, again, ticks

00:44:01.730 --> 00:44:04.670
six to ten days after the initial bleed. The

00:44:04.670 --> 00:44:06.710
blood vessels are clamping down tightly in response

00:44:06.710 --> 00:44:09.550
to the toxic blood. Exactly. The vessels downstream

00:44:09.550 --> 00:44:12.510
from the secured aneurysm are violently spasming,

00:44:12.630 --> 00:44:15.110
narrowing to a pinprick, starving the brain tissue.

00:44:15.409 --> 00:44:18.550
So how do we force oxygenated blood through a

00:44:18.550 --> 00:44:21.289
rigid, spastic, narrowed pipe? Use it to push

00:44:21.289 --> 00:44:23.690
harder. We artificially increase the driving

00:44:23.690 --> 00:44:25.849
pressure and the fluid volume going through it.

00:44:26.170 --> 00:44:28.269
We utilize hyperdynamic therapy, historically

00:44:28.269 --> 00:44:31.639
known as Triple H therapy, hyperbolemia, hemodilution

00:44:31.639 --> 00:44:33.840
and induced hypertension. So you pump them full

00:44:33.840 --> 00:44:36.320
of fluids. We pump them full of IV fluids to

00:44:36.320 --> 00:44:38.980
expand their blood volume. And we use vasopressors

00:44:38.980 --> 00:44:41.159
to force their systemic blood pressure high enough

00:44:41.159 --> 00:44:44.000
to physically push blood past the spasm and keep

00:44:44.000 --> 00:44:47.840
the brain tissue alive. So it is a complete 180

00:44:47.840 --> 00:44:50.579
degree reversal in management. You aggressively

00:44:50.579 --> 00:44:53.400
drop the pressure to stop the bleed. You secure

00:44:53.400 --> 00:44:56.179
the vessel and then you intentionally spike the

00:44:56.179 --> 00:44:58.639
pressure to defeat the secondary spasm. It is

00:44:58.639 --> 00:45:01.940
a terrifying tightrope. walk over an active volcano.

00:45:02.099 --> 00:45:04.840
And it requires constant minute -by -minute vigilance

00:45:04.840 --> 00:45:07.800
from the bedside nurse. What about fluids? You

00:45:07.800 --> 00:45:10.159
mentioned hypervolemia? Avoid dehydration at

00:45:10.159 --> 00:45:13.320
all costs. We use volume expansion with isotonic

00:45:13.320 --> 00:45:15.719
crystalloids or sometimes colloids like albumin

00:45:15.719 --> 00:45:17.880
post -clipping to maintain that hyperdynamic

00:45:17.880 --> 00:45:21.179
perfusion. You want their central venous pressure

00:45:21.179 --> 00:45:23.619
running high. Let's run through the complications.

00:45:23.920 --> 00:45:26.599
We know them, but let's formalize them. Most

00:45:26.599 --> 00:45:29.500
likely and most dangerous. The most likely immediate

00:45:29.500 --> 00:45:31.800
complication is re -bleeding, which typically

00:45:31.800 --> 00:45:34.260
occurs within the first 24 hours before we can

00:45:34.260 --> 00:45:36.739
get them to the operating room. The mortality

00:45:36.739 --> 00:45:39.739
for a re -bleed is catastrophic. The most dangerous

00:45:39.739 --> 00:45:42.719
delayed complication is the cerebral vasospasm

00:45:42.719 --> 00:45:45.760
hitting that day 6 to 10 window. If the patient

00:45:45.760 --> 00:45:48.679
is deteriorating, what is the ultimate physiological

00:45:48.679 --> 00:45:51.739
red flag? You are watching for Cushing's Triad.

00:45:52.139 --> 00:45:54.500
Explain the mechanism behind Cushing's Triad.

00:45:54.619 --> 00:45:57.559
What causes it? Cushing's triad is the terminal

00:45:57.559 --> 00:46:00.679
physiological response to overwhelmingly high

00:46:00.679 --> 00:46:03.420
intracranial pressure compressing the brainstem.

00:46:04.059 --> 00:46:06.920
As the ICP rises so high that it begins to equal

00:46:06.920 --> 00:46:09.800
the mean arterial pressure, the brain realizes

00:46:09.800 --> 00:46:12.500
it is entirely starved of blood. So what does

00:46:12.500 --> 00:46:14.929
the brain do? In a desperate final attempt to

00:46:14.929 --> 00:46:17.469
perfuse itself, the sympathetic nervous system

00:46:17.469 --> 00:46:20.449
triggers a massive systemic vasoconstriction

00:46:20.449 --> 00:46:23.409
to drive the systolic blood pressure up. So you

00:46:23.409 --> 00:46:26.190
see a skyrocketing systolic pressure with a widening

00:46:26.190 --> 00:46:28.710
pulse pressure, meaning the gap between the systolic

00:46:28.710 --> 00:46:31.050
and diastolic numbers gets very large. That's

00:46:31.050 --> 00:46:32.679
the first part. What about the heart rate? The

00:46:32.679 --> 00:46:35.280
baroceptors in the aortic arch sense this massive

00:46:35.280 --> 00:46:37.780
sudden spike in blood pressure. They panic and

00:46:37.780 --> 00:46:40.300
they trigger a strong parasympathetic reflex

00:46:40.300 --> 00:46:42.480
via the vagus nerve to slow the heart down to

00:46:42.480 --> 00:46:44.360
protect the systemic vessels. So the heart rate

00:46:44.360 --> 00:46:47.320
drops. So despite the high blood pressure, you

00:46:47.320 --> 00:46:49.940
see severe bradycardia. The heart rate drops

00:46:49.940 --> 00:46:53.199
into the 40s or 30s. Finally, the physical pressure

00:46:53.199 --> 00:46:56.360
crushing the medulla oblongata disrupts the respiratory

00:46:56.360 --> 00:46:59.420
centers, leading to altered, irregular, often

00:46:59.420 --> 00:47:01.980
Shane Stokes respirations. So Cushing's triad

00:47:01.980 --> 00:47:04.960
is? widening pulse pressure, severe bradycardia,

00:47:05.079 --> 00:47:07.760
and irregular respirations. If you see that,

00:47:07.860 --> 00:47:10.440
what is happening? Brain herniation is imminent

00:47:10.440 --> 00:47:12.599
or actively occurring. It is the ultimate late

00:47:12.599 --> 00:47:15.559
sign. When do you bypass the provider and immediately

00:47:15.559 --> 00:47:18.800
call a code or initiate rapid emergency protocols?

00:47:19.139 --> 00:47:22.179
If you witness a blown pupil, a pupil that becomes

00:47:22.179 --> 00:47:25.079
fully dilated, fixed, and non -reactive to light,

00:47:25.480 --> 00:47:27.840
that indicates the uncus of the temporal lobe

00:47:27.840 --> 00:47:29.880
is herniating downward and physically crushing

00:47:29.880 --> 00:47:32.179
the third cranial nerve. What about posturing?

00:47:32.320 --> 00:47:35.139
Or if the patient suddenly exhibits dequarticate

00:47:35.139 --> 00:47:37.639
posturing where the arms rigidly curl inward

00:47:37.639 --> 00:47:39.980
toward the core or decerebrate posturing where

00:47:39.980 --> 00:47:42.760
the arms rigidly extend outward and rotate. Both

00:47:42.760 --> 00:47:45.400
indicate severe, profound structural damage to

00:47:45.400 --> 00:47:47.880
the motor tracks and the brainstem. Pattern recognition

00:47:47.880 --> 00:47:51.260
time. If you see X plus Y plus Z. If you see

00:47:51.260 --> 00:47:55.000
a sudden agonizingly severe headache plus a stiff

00:47:55.000 --> 00:47:59.219
neck plus photophobia and vomiting. Think suvrachnoid

00:47:59.219 --> 00:48:02.329
hemorrhage. Give me an ICU pearl for the exam,

00:48:02.510 --> 00:48:05.469
something that novice nurses miss. The suctioning

00:48:05.469 --> 00:48:07.730
trap. Let's say you have an intubated patient

00:48:07.730 --> 00:48:11.469
with an unclipped, unsecured aneurysm. The wall

00:48:11.469 --> 00:48:13.989
of that aneurysm might be literally paper thin,

00:48:14.389 --> 00:48:16.409
currently being held together only by a tiny,

00:48:16.909 --> 00:48:19.960
fragile, unstable platelet plug. Okay, so it's

00:48:19.960 --> 00:48:22.300
a ticking bomb. If the nurse routinely goes in

00:48:22.300 --> 00:48:24.739
and performs vigorous endotracheal suctioning,

00:48:25.000 --> 00:48:28.019
or if the patient gags, bears down, or coughs

00:48:28.019 --> 00:48:30.760
violently, it causes a massive instantaneous

00:48:30.760 --> 00:48:33.320
spike in intra -thoracic pressure. Which translates

00:48:33.320 --> 00:48:35.340
directly up the jugular veins into the skull.

00:48:35.440 --> 00:48:38.159
And pox the aneurysm. A routine episode of vigorous

00:48:38.159 --> 00:48:40.300
suctioning before the aneurysm is secured can

00:48:40.300 --> 00:48:42.599
cause it to instantly re -rupture and kill the

00:48:42.599 --> 00:48:44.960
patient in the bed. That is terrifying. You must

00:48:44.960 --> 00:48:47.159
keep the environment highly controlled, dim the

00:48:47.159 --> 00:48:50.030
lights, restrict visitors, aggressively manage

00:48:50.030 --> 00:48:52.989
pain and nausea, and minimize all noxious stimuli,

00:48:53.469 --> 00:48:55.849
including unnecessary suctioning. Let's summarize

00:48:55.849 --> 00:48:58.110
the intensivist thinking for the hemorrhagic

00:48:58.110 --> 00:49:00.750
stroke. The primary problem is active bleeding

00:49:00.750 --> 00:49:04.789
inside a closed, rigid box. The failing physiology

00:49:04.789 --> 00:49:07.570
is the destruction of brain tissue via mass effect

00:49:07.570 --> 00:49:10.150
and a massive spike in intracranial pressure,

00:49:11.489 --> 00:49:14.550
brain stem herniation, and delayed cerebral vasospasm.

00:49:15.190 --> 00:49:17.730
The primary interventions are absolute blood

00:49:17.730 --> 00:49:20.250
pressure control initially, followed by surgical

00:49:20.250 --> 00:49:22.869
clipping or endovascular coiling, often accompanied

00:49:22.869 --> 00:49:25.289
by a ventriculostomy for pressure relief and

00:49:25.289 --> 00:49:28.719
subsequent hyperdynamic therapy. Reassessment

00:49:28.719 --> 00:49:31.980
requires continuous monitoring of the GCS, pupillary

00:49:31.980 --> 00:49:34.820
response, and exact ICP numbers from the monitor.

00:49:35.360 --> 00:49:37.699
If you remember only five things about the hemorrhagic

00:49:37.699 --> 00:49:42.559
pathway, one, the core pathophysiology is arterial

00:49:42.559 --> 00:49:44.920
bleeding creating a mass effect, immediately

00:49:44.920 --> 00:49:47.480
spiking the ICP and crushing healthy brain tissue.

00:49:47.860 --> 00:49:50.599
Right. Two, the key assessment finding is the

00:49:50.599 --> 00:49:52.460
sudden onset of the worst headache of my life.

00:49:52.619 --> 00:49:56.019
accompanied by meningeal irritation and a rapidly

00:49:56.019 --> 00:49:58.780
altering level of consciousness. Three, the most

00:49:58.780 --> 00:50:01.019
dangerous complications are immediate brain herniation

00:50:01.019 --> 00:50:03.340
and delayed secondary ischemia from cerebral

00:50:03.340 --> 00:50:07.380
vasospasms. Four, your priority nursing actions

00:50:07.380 --> 00:50:10.119
are securing the airway, implementing strict

00:50:10.119 --> 00:50:12.260
blood pressure control to keep the systolic below

00:50:12.260 --> 00:50:15.860
160, maintaining a midline head position, and

00:50:15.860 --> 00:50:19.300
minimizing all physical stimulation. The most

00:50:19.300 --> 00:50:21.500
important definitive treatments are surgical

00:50:21.500 --> 00:50:24.320
clipping or endovascular coiling, followed by

00:50:24.320 --> 00:50:29.119
nematopine administration. A patient suddenly

00:50:29.119 --> 00:50:31.920
clutches their head, screams about an agonizing

00:50:31.920 --> 00:50:34.599
thunderclap headache, begins vomiting aggressively,

00:50:35.119 --> 00:50:37.699
and rapidly loses consciousness. And your action

00:50:37.699 --> 00:50:40.539
phrase. If you see a sudden agonizing headache

00:50:40.539 --> 00:50:43.159
with declining LOC, think hemorrhagic stroke,

00:50:43.659 --> 00:50:45.719
initiate immediate blood pressure control, and

00:50:45.719 --> 00:50:48.539
rush for a non -contrast CT. Those are the two

00:50:48.539 --> 00:50:51.920
high -stakes pathways. But navigating the hyperacute

00:50:51.920 --> 00:50:54.780
phase in the ICU is merely the beginning of the

00:50:54.780 --> 00:50:57.940
war. Which brings us to Section 3. We have stabilized

00:50:57.940 --> 00:51:00.599
the patient. The clot is dissolved or the aneurysm

00:51:00.599 --> 00:51:03.059
is clipped. The alarms have finally stopped blaring,

00:51:03.360 --> 00:51:05.780
but as the sedation wears off, the reality sets

00:51:05.780 --> 00:51:08.019
in. The patient wakes up and they are fundamentally

00:51:08.019 --> 00:51:11.099
changed. This is where clinical pattern recognition

00:51:11.099 --> 00:51:13.800
becomes vital for long -term rehabilitation,

00:51:14.500 --> 00:51:17.440
nursing care, and family education. You have

00:51:17.440 --> 00:51:19.860
to deeply understand the difference between right

00:51:19.860 --> 00:51:22.440
brain damage and left brain damage because they

00:51:22.440 --> 00:51:25.739
produce two entirely distinct behavioral and

00:51:25.739 --> 00:51:28.280
physical presentations. Let's start with left

00:51:28.280 --> 00:51:31.159
brain damage. Because of the pyramidal crossing

00:51:31.159 --> 00:51:34.280
we discussed earlier, a stroke in the left hemisphere

00:51:34.280 --> 00:51:37.440
results in right hemiplegia paralysis or weakness

00:51:37.440 --> 00:51:39.699
on the right side of the body. But the cognitive

00:51:39.699 --> 00:51:42.139
impact is what defines the care. In the vast

00:51:42.139 --> 00:51:44.199
majority of the population, the left hemisphere

00:51:44.199 --> 00:51:46.820
is the dominant center for language, logic, and

00:51:46.820 --> 00:51:49.860
analytical processing. Therefore, left brain

00:51:49.860 --> 00:51:52.699
stroke patients almost universally suffer from

00:51:52.699 --> 00:51:56.059
some form of aphasia, a profound language deficit.

00:51:56.260 --> 00:51:58.019
How does that affect their psychology and behavior?

00:51:58.239 --> 00:52:01.179
They are painfully, acutely aware of their deficits.

00:52:01.440 --> 00:52:03.420
Their logic centers are intact, so they fully

00:52:03.420 --> 00:52:05.539
understand that they're paralyzed, and they fully

00:52:05.539 --> 00:52:07.519
understand that they cannot communicate. That

00:52:07.519 --> 00:52:09.920
has to be devastating. Because of this awareness,

00:52:10.480 --> 00:52:13.440
their behavior is usually very slow, very hesitant,

00:52:13.679 --> 00:52:17.139
and hypercautious. They are highly prone to severe

00:52:17.139 --> 00:52:19.980
depression, anxiety, and profound frustration

00:52:19.980 --> 00:52:22.699
because they understand exactly the magnitude

00:52:22.699 --> 00:52:24.880
of what they have lost. And we contrast that

00:52:24.880 --> 00:52:27.159
with right brain damage, which creates almost

00:52:27.159 --> 00:52:30.260
the exact opposite psychological profile. right

00:52:30.260 --> 00:52:33.460
brain damage causes left hemiplegia. But the

00:52:33.460 --> 00:52:36.300
right hemisphere is the center for spatial perception,

00:52:36.679 --> 00:52:39.239
facial recognition, impulsivity, and executive

00:52:39.239 --> 00:52:42.539
judgment. These patients suffer from severe spatial

00:52:42.539 --> 00:52:44.760
perceptual deficits. And they don't always realize

00:52:44.760 --> 00:52:46.860
it, do they? And critically, they experience

00:52:46.860 --> 00:52:50.000
anasognosia. They often deny or actively minimize

00:52:50.000 --> 00:52:52.440
their physical problems. They literally do not

00:52:52.440 --> 00:52:54.539
realize they are impaired. I want to use an analogy

00:52:54.539 --> 00:52:56.280
here to paint the picture of what this looks

00:52:56.280 --> 00:52:58.500
like on the rehab floor. Imagine you have two

00:52:58.500 --> 00:53:01.000
patients, both paralyzed on one side, sitting

00:53:01.000 --> 00:53:03.539
in wheelchairs. The left brain stroke patient

00:53:03.539 --> 00:53:06.219
will sit in that wheelchair, stare at their paralyzed

00:53:06.219 --> 00:53:08.900
arm, fully understand that they cannot walk.

00:53:09.289 --> 00:53:11.949
and they will be terrified to even attempt to

00:53:11.949 --> 00:53:13.969
move without a physical therapist holding onto

00:53:13.969 --> 00:53:17.389
them, they are appropriately cautious. But the

00:53:17.389 --> 00:53:20.110
right brain stroke patient, who is equally paralyzed,

00:53:20.769 --> 00:53:23.110
will confidently decide they want to go to the

00:53:23.110 --> 00:53:25.969
bathroom, try to stand up without locking the

00:53:25.969 --> 00:53:28.710
wheelchair wheels, and immediately fall face

00:53:28.710 --> 00:53:31.389
first onto the floor. Exactly. Because their

00:53:31.389 --> 00:53:33.449
judgment and spatial awareness are destroyed,

00:53:33.909 --> 00:53:35.969
they believe they can still walk perfectly fine.

00:53:36.300 --> 00:53:38.440
The right brain stroke patient is an absolute

00:53:38.440 --> 00:53:40.780
massive fall risk. They're impulsive. They are

00:53:40.780 --> 00:53:43.340
incredibly impulsive. They lack all safety awareness,

00:53:43.340 --> 00:53:46.000
and you cannot trust their judgment for a second.

00:53:46.159 --> 00:53:48.280
You have to utilize bed alarms, constant supervision,

00:53:48.559 --> 00:53:51.099
and physical safeguards. Let's dive deeper into

00:53:51.099 --> 00:53:53.179
the communication aspect because dealing with

00:53:53.179 --> 00:53:55.539
aphasia is one of the most challenging aspects

00:53:55.539 --> 00:53:58.519
of bedside nursing. It is not just one uniform

00:53:58.519 --> 00:54:01.760
condition. The anatomy dictates the presentation.

00:54:02.010 --> 00:54:05.289
We classify aphasia broadly into non -fluent

00:54:05.289 --> 00:54:08.469
and fluent categories. Let's look at Broca's

00:54:08.469 --> 00:54:11.610
aphasia, which is non -fluent or expressive aphasia.

00:54:11.750 --> 00:54:13.849
What part of the brain is that? The damage here

00:54:13.849 --> 00:54:16.630
is localized to the frontal lobe, specifically

00:54:16.630 --> 00:54:19.269
Broca's area, which handles a motor planning

00:54:19.269 --> 00:54:22.329
for speech. In these patients, their intellect

00:54:22.329 --> 00:54:24.909
and comprehension are completely intact. They

00:54:24.909 --> 00:54:27.329
know exactly what they want to say, but the physical

00:54:27.329 --> 00:54:30.090
motor pathway to articulate the words is broken.

00:54:30.309 --> 00:54:31.960
So they might try to tell you, really need to

00:54:31.960 --> 00:54:34.300
use the restroom right now. But the only words

00:54:34.300 --> 00:54:36.719
they can force out of their mouth are restroom.

00:54:37.099 --> 00:54:41.340
Go. Yes. It requires immense exhausting physical

00:54:41.340 --> 00:54:44.099
effort to speak. And because they can hear themselves

00:54:44.099 --> 00:54:46.920
failing to articulate their thoughts, they experience

00:54:46.920 --> 00:54:50.320
massive frustration and frequent emotional outbursts.

00:54:50.400 --> 00:54:53.139
Now contrast that with Wernicke's aphasia. Wernicke's

00:54:53.139 --> 00:54:56.280
is fluent or receptive aphasia. The damage is

00:54:56.280 --> 00:54:58.559
in the temporal lobe, the area responsible for

00:54:58.559 --> 00:55:01.179
processing and comprehending language. These

00:55:01.179 --> 00:55:03.420
patients can speak fluently. It sounds normal.

00:55:03.559 --> 00:55:06.099
The words flow out of their mouth effortlessly

00:55:06.099 --> 00:55:09.070
with normal rhythm and inflection, but the words

00:55:09.070 --> 00:55:11.050
are completely disconnected from meaning. It

00:55:11.050 --> 00:55:13.530
is referred to as word salad. They might point

00:55:13.530 --> 00:55:16.530
to a cup of water and say, you know that the

00:55:16.530 --> 00:55:19.590
smoodle pinkered the sideways and they genuinely

00:55:19.590 --> 00:55:22.050
believe they just asked for a drink? Exactly.

00:55:22.280 --> 00:55:25.320
And the tragic part is that they cannot comprehend

00:55:25.320 --> 00:55:27.659
what you are saying to them either. Because their

00:55:27.659 --> 00:55:29.719
comprehension is broken, they have absolutely

00:55:29.719 --> 00:55:31.820
no idea that they aren't making sense. That has

00:55:31.820 --> 00:55:33.659
to be confusing for them. They will often get

00:55:33.659 --> 00:55:35.599
angry at the nurse for not understanding their

00:55:35.599 --> 00:55:38.639
perfectly fluent nonsensical sentences. So what

00:55:38.639 --> 00:55:41.360
is the concrete nursing action for communicating

00:55:41.360 --> 00:55:44.440
with severe aphasia? Environmental control and

00:55:44.440 --> 00:55:47.920
patience. Decrease all background noise. Turn

00:55:47.920 --> 00:55:51.420
off the TV. Present only one single thought or

00:55:51.420 --> 00:55:54.659
simple command at a time. Utilize visual cues,

00:55:54.840 --> 00:55:56.980
pointing, and communication boards with pictures.

00:55:57.079 --> 00:56:00.239
And the big one. And the absolute cardinal rule

00:56:00.239 --> 00:56:04.380
of neuro -nursing. Do not ever pretend you understand

00:56:04.380 --> 00:56:06.719
them if you don't. It is deftly patronizing.

00:56:07.480 --> 00:56:09.340
The patient will almost always realize you are

00:56:09.340 --> 00:56:12.099
faking it, and it permanently destroys the therapeutic

00:56:12.099 --> 00:56:15.489
trust. What do you say instead? Calmly and gently

00:56:15.489 --> 00:56:18.269
say, I am so sorry, I am having trouble understanding,

00:56:18.730 --> 00:56:20.969
and immediately offer a different method, like

00:56:20.969 --> 00:56:23.670
a pen and paper or a picture board. Let's move

00:56:23.670 --> 00:56:26.610
to the visual and spatial deficits. We see a

00:56:26.610 --> 00:56:29.289
condition called homonymous hemianopsia. Break

00:56:29.289 --> 00:56:32.710
down that terminology. Homo means same. Hemianopsia

00:56:32.710 --> 00:56:35.590
means half blindness. It is blindness in the

00:56:35.590 --> 00:56:38.190
exact same half of the visual field in both eyes.

00:56:38.590 --> 00:56:41.389
If a patient has right -sided homonymous hemianopsia,

00:56:41.590 --> 00:56:43.809
they literally cannot see anything in the right

00:56:43.809 --> 00:56:45.750
half of their visual field. It's just black.

00:56:46.090 --> 00:56:48.570
It isn't just blurry. It simply does not exist

00:56:48.570 --> 00:56:50.869
in their constructed reality. So if a nurse sets

00:56:50.869 --> 00:56:52.949
a food tray down directly in front of them? The

00:56:52.949 --> 00:56:54.969
patient will only eat the food located on the

00:56:54.969 --> 00:56:57.070
left side of the plate. They will complain they

00:56:57.070 --> 00:56:59.210
are still hungry, completely ignoring the chicken

00:56:59.210 --> 00:57:01.590
and vegetables sitting on the right side. They

00:57:01.590 --> 00:57:03.489
will only shave the left side of their face.

00:57:03.829 --> 00:57:06.769
How does our clinical action adapt to this over

00:57:06.769 --> 00:57:09.590
time? It happens in two phases. Initially, in

00:57:09.590 --> 00:57:11.909
the acute ICU phase when they are overwhelmed,

00:57:12.429 --> 00:57:14.429
you must approach them from their unaffected

00:57:14.429 --> 00:57:17.389
side. You place their food, their water, and

00:57:17.389 --> 00:57:19.269
their call light on the side they can actually

00:57:19.269 --> 00:57:21.730
see. What if you approach from the blind side?

00:57:21.920 --> 00:57:24.179
If you approach from the blind side, you will

00:57:24.179 --> 00:57:26.400
startle them violently or they will simply ignore

00:57:26.400 --> 00:57:29.780
you. But later, as they transition into rehabilitation,

00:57:30.219 --> 00:57:33.099
the therapy completely flips. We force them to

00:57:33.099 --> 00:57:36.039
look. We begin placing items slightly into their

00:57:36.039 --> 00:57:38.400
blind field, forcing them to learn to consciously

00:57:38.400 --> 00:57:41.679
turn their head and actively scan the room to

00:57:41.679 --> 00:57:43.659
compensate for the blind spot. Let's talk about

00:57:43.659 --> 00:57:47.159
basic physiological maintenance, GI and GU issues.

00:57:47.599 --> 00:57:49.780
Constipation is universally the most common bowel

00:57:49.780 --> 00:57:52.880
problem post -stroke. It is a compounding issue

00:57:52.880 --> 00:57:56.219
driven by sudden immobility, weakened abdominal

00:57:56.219 --> 00:57:58.559
muscles making it difficult to bear down, and

00:57:58.559 --> 00:58:01.179
systemic dehydration because they cannot safely

00:58:01.179 --> 00:58:03.860
swallow thin liquids. You have to proactively

00:58:03.860 --> 00:58:06.699
manage a bowel regimen. But the major critical

00:58:06.699 --> 00:58:09.019
care pearl here, the thing that actually facilitates

00:58:09.019 --> 00:58:11.760
brain healing, revolves around nutrition. Let's

00:58:11.760 --> 00:58:15.159
get into VBTF, volume -based tube feeding. Why

00:58:15.159 --> 00:58:18.079
is this protocol replacing traditional set -rate

00:58:18.079 --> 00:58:20.940
tube feeding for stroke patients? Because traditional

00:58:20.940 --> 00:58:23.980
feeding stars the healing brain. Traditionally,

00:58:24.440 --> 00:58:27.159
a provider orders a tube feeding rate of, say,

00:58:27.480 --> 00:58:30.159
50 milliliters an hour. But an active stroke

00:58:30.159 --> 00:58:32.880
patient in the step -down or rehab unit is constantly

00:58:32.880 --> 00:58:34.719
leaving the floor. They're going to therapy.

00:58:34.920 --> 00:58:36.900
They go to physical therapy, occupational therapy,

00:58:37.179 --> 00:58:39.679
a speech swallow study, or down for a follow

00:58:39.679 --> 00:58:42.659
-up CT scan. Every single time they leave the

00:58:42.659 --> 00:58:46.099
bed, the nurse pauses the tube feed pump to prevent

00:58:46.099 --> 00:58:48.639
aspiration during transport. So the patient leaves

00:58:48.639 --> 00:58:50.900
for three hours of therapy, comes back, and the

00:58:50.900 --> 00:58:53.260
nurse restarts the pump at the ordered 50 milliliters

00:58:53.260 --> 00:58:55.699
an hour. But the patient just permanently miss

00:58:55.699 --> 00:58:57.980
150 milliliters of vital nutrition that they

00:58:57.980 --> 00:59:00.719
will never get back. Exactly. Retrospective studies

00:59:00.719 --> 00:59:02.960
show these patients were consistently only receiving

00:59:02.960 --> 00:59:05.619
about 60 % of their prescribed daily calories.

00:59:05.739 --> 00:59:08.570
And here's the physiology. The brain cannot heal

00:59:08.570 --> 00:59:11.070
neuroplastic pathways. It cannot build new synapses

00:59:11.070 --> 00:59:13.090
without massive amounts of metabolic energy.

00:59:13.389 --> 00:59:16.909
So VBTF solves this. VBTF solves this mathematical

00:59:16.909 --> 00:59:20.170
error. Instead of ordering a set hourly rate,

00:59:20.630 --> 00:59:22.789
the physician orders a total required volume

00:59:22.789 --> 00:59:25.929
over a 24 -hour period. If the patient misses

00:59:25.929 --> 00:59:28.409
three hours of feeding for therapy, the nurse

00:59:28.409 --> 00:59:31.010
recalculates the remaining volume and increases

00:59:31.010 --> 00:59:32.949
the hourly rate for the rest of the day to catch

00:59:32.949 --> 00:59:35.409
up. It ensures they get what they need. It ensures

00:59:35.409 --> 00:59:37.829
they receive every single prescribed calorie.

00:59:38.429 --> 00:59:40.469
It forces the medical team to treat nutrition

00:59:40.469 --> 00:59:43.889
not as a dietary afterthought, but as a critical,

00:59:44.090 --> 00:59:46.690
titrated medication required for cellular healing.

00:59:46.849 --> 00:59:48.809
That perfectly connects the bedside logistics

00:59:48.809 --> 00:59:51.349
back to the cellular pathophysiology, and that

00:59:51.349 --> 00:59:53.670
brings us full circle. I want to take a moment

00:59:53.670 --> 00:59:55.449
to connect all of this back to you, the listener.

00:59:55.610 --> 00:59:59.070
It's all on you. If you are that ICU nurse standing

00:59:59.070 --> 01:00:01.989
at the bedside, the sheer weight of the responsibility

01:00:01.989 --> 01:00:05.289
you hold is staggering. The intensivist might

01:00:05.289 --> 01:00:07.889
write the orders during rounds, but you are the

01:00:07.889 --> 01:00:10.389
one executing the critical thinking in real time,

01:00:10.590 --> 01:00:13.550
second by second. You are the one doing the hourly

01:00:13.550 --> 01:00:16.130
neuro checks at three point a .m. You're the

01:00:16.130 --> 01:00:17.769
one who has to notice that the right pupil is

01:00:17.769 --> 01:00:20.010
reacting just one millimeter more sluggishly

01:00:20.010 --> 01:00:22.949
than it was an hour ago. Exactly. You are the

01:00:22.949 --> 01:00:25.909
one walking the terrifying blood pressure tightrope,

01:00:26.110 --> 01:00:28.170
advocating for permissive hypertension up to

01:00:28.170 --> 01:00:30.849
215, but instantly intervening before it hits

01:00:30.849 --> 01:00:34.289
221. You are the one fiercely guarding the airway

01:00:34.289 --> 01:00:36.329
and demanding the formal speech therapy swallow

01:00:36.329 --> 01:00:39.250
screen before anyone hands that patient a single

01:00:39.250 --> 01:00:41.610
pill. You are the final line of defense between

01:00:41.610 --> 01:00:44.309
recovery and permanent devastating disability

01:00:44.309 --> 01:00:47.750
or death. Spotting the subtle deterioration trend,

01:00:48.190 --> 01:00:50.710
the slowly rising heart rate, the slight widening

01:00:50.710 --> 01:00:53.130
of the pulse pressure, the transient slurring

01:00:53.130 --> 01:00:55.510
of a single word that clinical vigilance is what

01:00:55.510 --> 01:00:58.190
saves the penumbra. It is what keeps the brain

01:00:58.190 --> 01:01:00.230
alive. I want to leave you with a final thought,

01:01:00.750 --> 01:01:02.989
a concept from the deep rehabilitation phase

01:01:02.989 --> 01:01:05.329
that fundamentally changes how we view the brain.

01:01:05.480 --> 01:01:07.960
We spent this entire time talking about the fragility

01:01:07.960 --> 01:01:10.440
of the brain, the terrifying five -minute window

01:01:10.440 --> 01:01:12.880
of ischemia, the catastrophic destruction of

01:01:12.880 --> 01:01:15.599
a hemorrhage. It sounds so delicate. But there

01:01:15.599 --> 01:01:17.719
is a therapy called constraint -induced movement

01:01:17.719 --> 01:01:20.900
therapy, or CIMT, that reveals a completely different

01:01:20.900 --> 01:01:24.320
reality. It is the most raw, undeniable demonstration

01:01:24.320 --> 01:01:27.179
of neuroplasticity we have. Imagine a patient

01:01:27.179 --> 01:01:30.019
who has survived a right brain stroke. They are

01:01:30.019 --> 01:01:32.949
left with a completely paralyzed left arm. In

01:01:32.949 --> 01:01:34.690
traditional therapy, you might just teach them

01:01:34.690 --> 01:01:37.010
how to adapt and live life using only their good

01:01:37.010 --> 01:01:40.349
right arm. Right. But in CIMT, the physical therapists

01:01:40.349 --> 01:01:42.190
take that patient's fully functional, perfectly

01:01:42.190 --> 01:01:44.730
good right arm and they literally immobilize

01:01:44.730 --> 01:01:47.579
it. They strap it to their torso or put it in

01:01:47.579 --> 01:01:49.840
a massive restrictive mitt so the patient cannot

01:01:49.840 --> 01:01:52.320
use it for anything. And then for hours a day,

01:01:52.480 --> 01:01:55.119
they force the patient to perform complex tasks,

01:01:55.559 --> 01:01:58.420
stacking blocks, eating, writing, using only

01:01:58.420 --> 01:02:01.199
the paralyzed left arm. It is an intensely brutal,

01:02:01.519 --> 01:02:04.079
endlessly frustrating psychological and physical

01:02:04.079 --> 01:02:06.619
process for the patient. They fail repeatedly.

01:02:07.380 --> 01:02:10.130
But here is the magic. By aggressively constraining

01:02:10.130 --> 01:02:12.590
the good arm, it forces the brain to realize

01:02:12.590 --> 01:02:15.190
it can no longer rely on the established surviving

01:02:15.190 --> 01:02:17.909
pathways. It has to adapt. The sheer metabolic,

01:02:18.329 --> 01:02:20.849
electrical, and physical demand of desperately

01:02:20.849 --> 01:02:23.849
trying to move that paralyzed limb forces the

01:02:23.849 --> 01:02:26.469
surviving neurons adjacent to the stroke core

01:02:26.469 --> 01:02:30.250
to physically grow new dendrites. They form entirely

01:02:30.250 --> 01:02:34.170
new synapses. The brain literally rewires a brand

01:02:34.170 --> 01:02:36.369
new architectural route around the dead tissue

01:02:36.369 --> 01:02:39.519
to regain motor control. It definitively proves

01:02:39.519 --> 01:02:41.860
that the physiological fight does not end when

01:02:41.860 --> 01:02:45.400
the patient is discharged from the ICU. The brain's

01:02:45.400 --> 01:02:48.239
incredible capacity to heal, to physically remodel

01:02:48.239 --> 01:02:50.900
itself and find alternative routes, persists

01:02:50.900 --> 01:02:54.139
for years after the initial insult. It is remarkably

01:02:54.139 --> 01:02:56.920
stubbornly resilient. The human brain will completely

01:02:56.920 --> 01:02:58.880
rebuild its own operating system to survive.

01:02:59.519 --> 01:03:02.000
But only if you, the elite critical care team,

01:03:02.269 --> 01:03:04.489
can maintain the perfusion, manage the pressure,

01:03:04.590 --> 01:03:06.809
and keep that tissue alive during those crucial

01:03:06.809 --> 01:03:09.690
high stakes first few hours. Time is brain. Protect

01:03:09.690 --> 01:03:11.849
the penumbra. Thanks for diving deep with us.

01:03:11.949 --> 01:03:13.570
Keep questioning, keep learning, and we'll catch

01:03:13.570 --> 01:03:14.230
you on the next one.