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 --> 00:00:42.420 room. Pulse check! No pulse. You know, if you 00:00:42.420 --> 00:00:44.640 break your arm, an x -ray gives you a pretty 00:00:44.640 --> 00:00:46.619 binary answer, right? It's like broken or not 00:00:46.619 --> 00:00:49.119 broken. You see that jagged white line on the 00:00:49.119 --> 00:00:51.460 film and the treatment plan is just obvious. 00:00:51.759 --> 00:00:53.439 Right, yeah. It's right there in front of you. 00:00:53.659 --> 00:00:57.039 Exactly. But in obstetric nursing, you are diagnosing 00:00:57.039 --> 00:01:00.820 a patient you literally cannot see, who can't 00:01:00.820 --> 00:01:03.840 speak, and whose survival is just entirely dependent 00:01:03.840 --> 00:01:07.159 on another patient. Welcome to the diagnostic 00:01:07.159 --> 00:01:09.140 muddy waters of antepartum care, everyone. It 00:01:09.140 --> 00:01:11.760 really is, I mean, the ultimate clinical challenge. 00:01:11.819 --> 00:01:14.579 You're constantly balancing two lives at once. 00:01:14.840 --> 00:01:17.900 And those physiological changes in the mother 00:01:17.900 --> 00:01:21.040 can completely mask serious complications. Yeah, 00:01:21.040 --> 00:01:22.700 which is terrifying when you think about it. 00:01:22.819 --> 00:01:25.120 It is. But for you listening, you know, the nursing 00:01:25.120 --> 00:01:28.420 student, the future safe nurse, our goal today 00:01:28.420 --> 00:01:31.180 is to cut through those muddy waters for you. 00:01:31.379 --> 00:01:34.079 We are applying the Pareto principle to all those 00:01:34.079 --> 00:01:36.879 dense OB textbook chapters on pregnancy management. 00:01:37.180 --> 00:01:40.859 So basically, we want that 20 % of high -yield 00:01:40.859 --> 00:01:43.680 core concepts that'll give you 80 % of your exam 00:01:43.680 --> 00:01:46.739 value. Exactly. And more importantly, we want 00:01:46.739 --> 00:01:49.099 to build your real -world clinical judgment. 00:01:49.659 --> 00:01:52.000 I'm going to act as your clinical mentor today. 00:01:52.379 --> 00:01:55.939 We're going to focus heavily on safety, priorities, 00:01:56.560 --> 00:01:59.480 and spotting those sneaky exam traps. Awesome. 00:01:59.500 --> 00:02:01.040 So we're going to build this chronologically. 00:02:01.640 --> 00:02:04.079 I feel like we have to start at the absolute 00:02:04.079 --> 00:02:07.459 foundation, which is the dates. Because, well, 00:02:07.640 --> 00:02:09.580 if you're building a house and the start date 00:02:09.580 --> 00:02:11.979 on your construction blueprint is completely 00:02:11.979 --> 00:02:14.280 wrong. Oh, your whole timeline is ruined. Right. 00:02:14.439 --> 00:02:16.620 Every single milestone check down the line is 00:02:16.620 --> 00:02:18.780 going to be flagged as an error. Yeah. And if 00:02:18.780 --> 00:02:21.479 your foundation is doomed like that, you risk 00:02:21.479 --> 00:02:23.539 all these unnecessary medical interventions. 00:02:24.120 --> 00:02:25.979 You know, you might think the baby is experiencing 00:02:25.979 --> 00:02:28.199 this severe growth restriction, but in reality, 00:02:28.740 --> 00:02:30.680 your dates are just off by a month. Which happens 00:02:30.680 --> 00:02:33.280 a lot, right? All the time. This is why establishing 00:02:33.280 --> 00:02:36.080 an accurate estimated due date, or EDD, is your 00:02:36.080 --> 00:02:38.979 absolute first priority. So the high -yield core 00:02:38.979 --> 00:02:41.500 concept here, the one instructors test relentlessly, 00:02:41.860 --> 00:02:44.879 is no -jells rule. OK, yes, no -jells rule. Right. 00:02:44.879 --> 00:02:47.199 So you take the first day of the patient's last 00:02:47.199 --> 00:02:50.620 menstrual period, the LMP, you subtract three 00:02:50.620 --> 00:02:52.819 months, add seven days, and then, you know, add 00:02:52.819 --> 00:02:55.460 one year. Okay, let me try the math on that really 00:02:55.460 --> 00:02:59.500 quick. So, if the last menstrual period was October 00:02:59.500 --> 00:03:03.439 14th, I extract a season, so three months, which 00:03:03.439 --> 00:03:05.659 takes me back to July 14th. Yep, keep going. 00:03:06.120 --> 00:03:09.539 Then I add a week, getting me to July 21st. At 00:03:09.539 --> 00:03:12.650 a year... And the due date is July 21st of the 00:03:12.650 --> 00:03:14.889 following year. You've got it. Nigelli's math 00:03:14.889 --> 00:03:17.509 is simply minus a season plus a week. That's 00:03:17.509 --> 00:03:20.210 your memory anchor. And establishing that timeline 00:03:20.210 --> 00:03:22.530 immediately tells you where the patient is regarding 00:03:22.530 --> 00:03:25.009 early risks. Because there's a specific danger 00:03:25.009 --> 00:03:27.840 window, right? Huge danger window. The most dangerous 00:03:27.840 --> 00:03:30.379 time for a developing embryo -like, the period 00:03:30.379 --> 00:03:32.599 of greatest environmental sensitivity is actually 00:03:32.599 --> 00:03:35.719 between days 17 and 56 after conception. Wait, 00:03:35.879 --> 00:03:38.300 days 17 to 56? I mean, a lot of patients don't 00:03:38.300 --> 00:03:40.340 even know they're pregnant yet at day 17. And 00:03:40.340 --> 00:03:42.759 that is exactly why preconception care matters 00:03:42.759 --> 00:03:46.460 so much. During that specific window, organogenesis 00:03:46.460 --> 00:03:49.020 is happening. The organs are actively forming. 00:03:49.120 --> 00:03:51.340 So that's the prime time for things to go wrong. 00:03:51.909 --> 00:03:55.090 Precisely. This is the ultimate danger zone for 00:03:55.090 --> 00:03:57.530 teratogens, you know, substances that cause birth 00:03:57.530 --> 00:04:01.550 defects. It's also why taking 400 to 800 micrograms 00:04:01.550 --> 00:04:04.229 of folic acid daily before pregnancy is just 00:04:04.229 --> 00:04:06.870 so critical. Folic acid prevents neural tube 00:04:06.870 --> 00:04:09.490 defects, right? Like spina bifida. Yes, exactly. 00:04:09.729 --> 00:04:12.050 But it has to be in the patient's system while 00:04:12.050 --> 00:04:14.090 that neural tube is actually closing early on. 00:04:14.169 --> 00:04:15.949 If they start taking it at week 12, it's well, 00:04:16.009 --> 00:04:17.790 the critical window has already closed. Got it. 00:04:17.790 --> 00:04:20.110 Yeah. So if I'm the nurse doing an intake assessment. 00:04:20.350 --> 00:04:23.250 What baseline factors am I looking at like what's 00:04:23.250 --> 00:04:25.430 expected and what should immediately trigger 00:04:25.430 --> 00:04:28.230 an alarm bill for me? Okay So an expected healthy 00:04:28.230 --> 00:04:30.629 baseline is a pre -pregnancy body mass index 00:04:30.629 --> 00:04:34.850 or BMI between 18 .5 and 24 .9 A highly concerning 00:04:34.850 --> 00:04:36.689 finding one that instantly elevates the patient 00:04:36.689 --> 00:04:39.990 to a high -risk category is a BMI over 30 Why 00:04:39.990 --> 00:04:42.889 does a BMI over 30 change the care plan so drastically? 00:04:43.009 --> 00:04:45.329 What's the physiological reason? because the 00:04:45.329 --> 00:04:48.089 physiological stress of obesity combined with 00:04:48.089 --> 00:04:50.629 the metabolic stress of pregnancy significantly 00:04:50.629 --> 00:04:52.810 increases the risk of systemic complications. 00:04:53.410 --> 00:04:55.550 It directly drives up the rates of gestational 00:04:55.550 --> 00:04:59.269 diabetes, preeclampsia, and honestly, the likelihood 00:04:59.269 --> 00:05:01.610 of needing a cesarean birth. OK, that makes sense. 00:05:01.970 --> 00:05:04.389 So your priority nursing action during this initial 00:05:04.389 --> 00:05:08.740 visit is what? Just screening. Screening is massive. 00:05:08.920 --> 00:05:10.980 You need to screen their medical history and 00:05:10.980 --> 00:05:13.600 their current medication list for any teratogens. 00:05:14.120 --> 00:05:16.759 Are there specific medications that instructors 00:05:16.759 --> 00:05:19.779 use as exam traps here? Because there are so 00:05:19.779 --> 00:05:22.319 many meds out there. Oh, definitely. You will 00:05:22.319 --> 00:05:24.920 almost always see isotretanone on exams. Which 00:05:24.920 --> 00:05:26.420 is Accutane, right? Yeah. The acne medication. 00:05:26.620 --> 00:05:28.759 Exactly. Many people know it as Accutane. It 00:05:28.759 --> 00:05:31.000 is an absolute contraindication for pregnancy. 00:05:31.360 --> 00:05:34.339 It causes severe craniofacial and cardiac birth 00:05:34.339 --> 00:05:37.000 defects. Wow. Absolute contraindication. Weenie 00:05:37.000 --> 00:05:39.139 others. Yeah. Another major trap is anti -epileptic 00:05:39.139 --> 00:05:43.019 drugs, particularly valproic acid. If a patient 00:05:43.019 --> 00:05:45.600 on valproic acid tells you they are even contemplating 00:05:45.600 --> 00:05:48.300 pregnancy, they need an immediate referral. To 00:05:48.300 --> 00:05:50.399 get off it completely. Not always completely, 00:05:50.800 --> 00:05:53.180 but their dosage must be adjusted to a safer 00:05:53.180 --> 00:05:56.819 level well before conception ever occurs. Seizures 00:05:56.819 --> 00:05:59.060 are dangerous during pregnancy, so it's a very 00:05:59.060 --> 00:06:01.959 delicate balance. Right, okay. So we've nailed 00:06:01.959 --> 00:06:05.300 down the start date and we've screened the blueprint 00:06:05.300 --> 00:06:08.000 for early risks. But a blueprint is useless if 00:06:08.000 --> 00:06:09.579 the builders aren't following it, right? Right. 00:06:09.790 --> 00:06:12.829 How do we actually know the baby is on schedule 00:06:12.829 --> 00:06:16.389 without doing a really costly ultrasound at every 00:06:16.389 --> 00:06:19.069 single prenatal visit? We use the McDonald method, 00:06:19.949 --> 00:06:21.949 and it requires nothing more than a simple tape 00:06:21.949 --> 00:06:24.730 measure. We track the physical growth by measuring 00:06:24.730 --> 00:06:26.870 the fundal height. I remember this. You measure 00:06:26.870 --> 00:06:29.269 in centimeters from the symphysis pubis, so the 00:06:29.269 --> 00:06:31.459 pubic bone. straight up the abdomen to the top 00:06:31.459 --> 00:06:33.339 of the fundus, which is the top of the uterus. 00:06:33.839 --> 00:06:35.920 Exactly. And there is a specific window where 00:06:35.920 --> 00:06:37.860 the math lines up perfectly, which instructors 00:06:37.860 --> 00:06:41.620 love to test. Between 20 and 36 weeks gestation, 00:06:41.939 --> 00:06:43.740 the measurement in centimeters should perfectly 00:06:43.740 --> 00:06:46.339 match the weeks of pregnancy. So wait, at 20 00:06:46.339 --> 00:06:48.480 weeks pregnant, the fundal height should be exactly 00:06:48.480 --> 00:06:51.259 20 centimeters. Yes, plus or minus maybe 2 centimeters, 00:06:51.399 --> 00:06:54.160 but 20 is the target. Where does 20 centimeters 00:06:54.160 --> 00:06:57.079 physically land on the mother's abdomen? Just 00:06:57.079 --> 00:06:59.540 so I can picture it right at the umbilicus. That 00:06:59.540 --> 00:07:02.240 is your primary memory anchor for the exam right 00:07:02.240 --> 00:07:05.879 there 20 weeks equals 20 centimeters equals the 00:07:05.879 --> 00:07:08.819 belly button 20 weeks 20 centimeters belly button 00:07:08.819 --> 00:07:12.839 Got it But why is this simple tape measure so 00:07:12.839 --> 00:07:15.959 critical for a nurse's clinical judgment? What 00:07:15.959 --> 00:07:18.439 happens when the numbers don't match up? It's 00:07:18.439 --> 00:07:21.160 basically your first line of defense for spotting 00:07:21.160 --> 00:07:24.079 hidden trouble. If you see a sudden drop or flattening 00:07:24.079 --> 00:07:26.560 of that growth curve, say the patient is 32 weeks 00:07:26.560 --> 00:07:28.680 pregnant but she's only measuring 28 centimeters, 00:07:29.139 --> 00:07:31.180 that indicates fetal growth restriction. The 00:07:31.180 --> 00:07:33.370 baby isn't thriving. Right. The placenta might 00:07:33.370 --> 00:07:35.810 be failing. Conversely, if the measurement is 00:07:35.810 --> 00:07:38.689 much larger than expected, you must suspect polyhydramnios. 00:07:38.750 --> 00:07:40.589 Which is an excess of amniotic fluid, right? 00:07:40.709 --> 00:07:43.430 Yes. Or it could be a multi -fetal gestation, 00:07:43.670 --> 00:07:46.149 like completely undetected twins. Oh, wow. Surprised 00:07:46.149 --> 00:07:48.149 twins. Exactly. So the tape measure tells you 00:07:48.149 --> 00:07:50.370 a lot. OK. Speaking of hidden complications, 00:07:50.990 --> 00:07:53.610 I really want to clarify RH incompatibility. 00:07:54.550 --> 00:07:56.370 Because I used to think of the mother's immune 00:07:56.370 --> 00:08:00.079 system like, um... like a nightclub bouncer refusing 00:08:00.079 --> 00:08:03.000 entry to the baby's blood. But that analogy kind 00:08:03.000 --> 00:08:04.560 of falls apart when you look at how it actually 00:08:04.560 --> 00:08:06.579 works. Yeah, it's not an immediate rejection. 00:08:06.620 --> 00:08:08.920 It's really more like a security system taking 00:08:08.920 --> 00:08:11.459 mug shots. Mug shots, yes. Let's break that down. 00:08:11.660 --> 00:08:14.319 OK, so if an Rh negative mother is carrying an 00:08:14.319 --> 00:08:17.579 Rh positive baby, her immune system doesn't necessarily 00:08:17.579 --> 00:08:19.980 attack during that first pregnancy. Because the 00:08:19.980 --> 00:08:21.800 blood hasn't really mixed yet. Right. Usually 00:08:21.800 --> 00:08:24.540 not until delivery. So when the blood finally 00:08:24.540 --> 00:08:26.699 mixes at birth, her immune system takes a mug 00:08:26.699 --> 00:08:30.040 shot of those foreign Rh -positive cells and 00:08:30.040 --> 00:08:33.059 quietly builds an army of antibodies. So the 00:08:33.059 --> 00:08:35.580 first baby usually escapes unharmed? They do. 00:08:35.899 --> 00:08:37.879 But during the next pregnancy, if that second 00:08:37.879 --> 00:08:40.840 baby is also Rh -positive, the immune system 00:08:40.840 --> 00:08:44.039 recognizes the mugshot. It deploys a SWAT team 00:08:44.039 --> 00:08:46.899 of antibodies across the placenta. And that SWAT 00:08:46.899 --> 00:08:49.460 team attacks the fetal red blood cells? Yes. 00:08:49.629 --> 00:08:52.210 It causes a lethal condition called hemolytic 00:08:52.210 --> 00:08:54.169 disease of the neonate, and it can literally 00:08:54.169 --> 00:08:57.710 destroy all future pregnancies if it's left unmanaged. 00:08:58.070 --> 00:09:01.929 That is terrifying. So if I'm the nurse, what 00:09:01.929 --> 00:09:05.669 is my absolute priority action to stop that immune 00:09:05.669 --> 00:09:08.950 response from ever happening? You check the mother's 00:09:08.950 --> 00:09:11.049 blood type immediately at the first prenatal 00:09:11.049 --> 00:09:13.830 visit. That's step one. If she is RH negative, 00:09:14.090 --> 00:09:16.870 you must administer anti -D immune globulin, 00:09:17.049 --> 00:09:19.990 often called ROGAM, at 28 weeks gestation. Okay, 00:09:20.169 --> 00:09:22.769 28 weeks. And then you give it again within 72 00:09:22.769 --> 00:09:25.429 hours after birth, but only if the newborn is 00:09:25.429 --> 00:09:28.110 confirmed to be RH positive. How does the medication 00:09:28.110 --> 00:09:30.289 actually work? Does it destroy the mugshots? 00:09:30.840 --> 00:09:33.580 Basically, yes. It essentially hides the Rh positive 00:09:33.580 --> 00:09:35.279 cells from the mother's immune system, so it 00:09:35.279 --> 00:09:37.080 never takes that mugshot in the first place. 00:09:37.440 --> 00:09:39.519 No mugshot, no SWAT team. That is brilliant. 00:09:39.840 --> 00:09:42.559 What is the ultimate exam trap here? Because 00:09:42.559 --> 00:09:44.460 I know there's one. Oh, there's a huge one. The 00:09:44.460 --> 00:09:47.600 trap is giving Rh immune globulin to an Rh positive 00:09:47.600 --> 00:09:50.480 mother. Instructors will try to sneak an Rh positive 00:09:50.480 --> 00:09:52.320 patient into a multiple choice question just 00:09:52.320 --> 00:09:54.600 to see if you are paying attention. Oh, so they'll 00:09:54.600 --> 00:09:57.340 say, patient is A positive, do you give ROAM? 00:09:57.620 --> 00:10:01.250 Exactly. And the answer is always no. It is only 00:10:01.250 --> 00:10:04.230 for Rh negative mothers. Giving it to an Rh positive 00:10:04.230 --> 00:10:07.070 patient is a massive safety failure on an exam. 00:10:07.350 --> 00:10:09.850 Got it. So a tape measure tells us the physical 00:10:09.850 --> 00:10:12.409 size and the blood type tells us about potential 00:10:12.409 --> 00:10:15.149 immune conflicts. But none of that tells us if 00:10:15.149 --> 00:10:17.850 the baby is actually stressed out or facing genetic 00:10:17.850 --> 00:10:20.070 complications inside the uterus. No, it doesn't. 00:10:20.210 --> 00:10:22.049 This is where we get to the alphabet soup of 00:10:22.049 --> 00:10:27.230 OB testing. We've got NST, BPP, CVS, MSAFP, and 00:10:27.230 --> 00:10:29.549 it honestly feels like memorizing random letters. 00:10:30.090 --> 00:10:32.149 But if we think of these tests as zooming in, 00:10:32.409 --> 00:10:34.600 I feel like it starts to make sense. I really 00:10:34.600 --> 00:10:36.460 like that framework. So the tape measure is the 00:10:36.460 --> 00:10:39.000 naked eye. The non -stress test, or NST, is like 00:10:39.000 --> 00:10:40.539 listening through the door. OK, listening through 00:10:40.539 --> 00:10:43.179 the door. Right, because it's entirely non -invasive. 00:10:43.440 --> 00:10:46.200 We basically monitor the fetal heart rate to 00:10:46.200 --> 00:10:48.379 see how it responds to the baby's own movements. 00:10:48.779 --> 00:10:51.139 And we are looking for a reactive result, right? 00:10:51.360 --> 00:10:53.100 What does reactive actually mean in terms of 00:10:53.100 --> 00:10:56.259 the hard numbers? Okay, so a reactive NST means 00:10:56.259 --> 00:10:59.120 we see at least two fetal heart rate accelerations 00:10:59.120 --> 00:11:01.700 of 15 beats per minute, lasting for at least 00:11:01.700 --> 00:11:04.600 15 seconds, all within a 20 -minute monitoring 00:11:04.600 --> 00:11:07.200 window. Okay, let me repeat that. Two accelerations, 00:11:07.480 --> 00:11:11.500 15 beats, 15 seconds, 20 minutes. Why is a reactive 00:11:11.500 --> 00:11:14.559 result so reassuring to us? Because it proves 00:11:14.559 --> 00:11:16.980 the fetal autonomic nervous system is fully intact 00:11:16.980 --> 00:11:20.070 and the baby is well oxygenated. Think about 00:11:20.070 --> 00:11:22.690 it. If the baby moves, the heart rate should 00:11:22.690 --> 00:11:24.669 naturally speed up, just like yours does when 00:11:24.669 --> 00:11:26.570 you go for a run. Right, my heart rate definitely 00:11:26.570 --> 00:11:29.309 spikes. Exactly. So when a non -reactive NST 00:11:29.309 --> 00:11:31.850 is concerning because it suggests fetal hypoxemia, 00:11:32.190 --> 00:11:34.370 the baby is essentially conserving energy because 00:11:34.370 --> 00:11:36.669 it lacks oxygen. Okay, so if the NST is listening 00:11:36.669 --> 00:11:39.289 through the door... Is the biophysical profile 00:11:39.289 --> 00:11:40.990 that BPP is at like looking through the window? 00:11:41.309 --> 00:11:44.470 Is it essentially an APGAR score for a baby still 00:11:44.470 --> 00:11:46.470 inside the womb? That is exactly what it is. 00:11:46.750 --> 00:11:49.269 If the NST is non -reactive, we escalate to the 00:11:49.269 --> 00:11:52.110 BPP. It uses real -time ultrasound to assess 00:11:52.110 --> 00:11:54.889 five specific variables. What are the five? It 00:11:54.889 --> 00:11:57.210 looks at the NST results, fetal breathing movements, 00:11:57.629 --> 00:11:59.909 general fetal movement, fetal tone sofflection, 00:12:00.309 --> 00:12:02.830 and the amniotic fluid volume. And how is it 00:12:02.830 --> 00:12:05.700 scored? Each of those five variables gets a score 00:12:05.700 --> 00:12:08.899 of either 0 or 2. There's no one. So it's scored 00:12:08.899 --> 00:12:12.059 out of 10. meaning an expected healthy finding 00:12:12.059 --> 00:12:14.740 would be a score of 8 to 10. Correct, but a score 00:12:14.740 --> 00:12:17.700 of 6 or below is a massive red flag. It indicates 00:12:17.700 --> 00:12:20.639 a compromised fetus and honestly, depending on 00:12:20.639 --> 00:12:22.940 the gestational age, you might be prepping for 00:12:22.940 --> 00:12:25.399 an emergency delivery right then and there. Wow, 00:12:25.460 --> 00:12:27.679 okay. Let's zoom in even further to the blood 00:12:27.679 --> 00:12:31.700 and tissue tests. The maternal serum alpha -fetoprotein, 00:12:31.840 --> 00:12:35.620 the MSAFP, this is drawn between 16 and 18 weeks, 00:12:35.639 --> 00:12:38.710 right? Yes. And this test screens for life -altering 00:12:38.710 --> 00:12:41.429 anomalies. It's basically measuring a specific 00:12:41.429 --> 00:12:43.769 protein produced by the fetus that crosses into 00:12:43.769 --> 00:12:45.669 the mom's blood. What do the results tell us? 00:12:45.870 --> 00:12:48.830 Well, an abnormally high MSAFP level indicates 00:12:48.830 --> 00:12:52.110 neural tube defects, such as anencephaly or spina 00:12:52.110 --> 00:12:55.309 bifida. An abnormally low level indicates chromosomal 00:12:55.309 --> 00:12:57.590 anomalies, most commonly Down syndrome. OK, so 00:12:57.590 --> 00:12:59.470 here's a quick memory anchor for you guys listening. 00:12:59.610 --> 00:13:02.889 High is open. Low is closed. High means an open 00:13:02.889 --> 00:13:05.409 neural tube defect. Low points a Down syndrome. 00:13:05.600 --> 00:13:08.360 That is perfect. That will absolutely save you 00:13:08.360 --> 00:13:11.379 points on exam day. But, and listen closely, 00:13:11.840 --> 00:13:14.299 there is a procedural exam trap here that is 00:13:14.299 --> 00:13:16.960 even more heavily tested. Oh, lay it on me. It's 00:13:16.960 --> 00:13:19.000 the difference between chorionic villus sampling, 00:13:19.460 --> 00:13:22.940 or CVS, and an amniocentesis. Right. They both 00:13:22.940 --> 00:13:25.240 test for genetic issues, so instructors just 00:13:25.240 --> 00:13:27.240 love to swap them in multiple choice questions 00:13:27.240 --> 00:13:29.700 to confuse you. Exactly. Here is how you beat 00:13:29.700 --> 00:13:33.230 the trap. CVS is an early test performed between 00:13:33.230 --> 00:13:36.909 10 and 13 weeks. The provider takes a tiny piece 00:13:36.909 --> 00:13:39.110 of placental tissue. Placental tissue, okay. 00:13:39.610 --> 00:13:42.110 Amniocentesis is a later test performed between 00:13:42.110 --> 00:13:45.190 15 and 20 weeks where the provider uses a long 00:13:45.190 --> 00:13:48.529 needle to extract actual amniotic fluid. The 00:13:48.529 --> 00:13:52.330 trap is this. CVS cannot detect neural tube defects. 00:13:52.409 --> 00:13:54.519 Wait, why not? If they're both genetic tests, 00:13:54.779 --> 00:13:57.139 why is CVS totally blind to neural tube defects? 00:13:57.480 --> 00:13:59.600 Think about the anatomy. Neural tube defects 00:13:59.600 --> 00:14:02.399 don't show up in placental tissue. An open neural 00:14:02.399 --> 00:14:05.419 tube leaks that alpha -fetoprotein directly into 00:14:05.419 --> 00:14:08.259 the amniotic fluid. Oh. So since CVS doesn't 00:14:08.259 --> 00:14:10.379 collect any amniotic fluid, it literally can't 00:14:10.379 --> 00:14:12.519 detect the propene leak. You got it. Only the 00:14:12.519 --> 00:14:14.519 amniocentesis can do that. That makes perfect 00:14:14.519 --> 00:14:16.480 sense when you actually understand the mechanism 00:14:16.480 --> 00:14:20.019 instead of just memorizing it. What is the priority 00:14:20.019 --> 00:14:22.740 nursing action if a patient is scheduled for 00:14:22.740 --> 00:14:26.059 an amniocentesis? This is huge for safety. You 00:14:26.059 --> 00:14:28.299 must ensure the patient empties their bladder 00:14:28.299 --> 00:14:31.440 immediately before the procedure. Just to physically 00:14:31.440 --> 00:14:33.240 move the bladder out of the way of the needle. 00:14:33.840 --> 00:14:36.240 Exactly. In late pregnancy, the bladder is pushed 00:14:36.240 --> 00:14:39.039 up. An accidental bladder puncture during an 00:14:39.039 --> 00:14:42.399 amnio is a very serious complication. Emptying 00:14:42.399 --> 00:14:45.000 it physically shrinks it down and drops it safely 00:14:45.000 --> 00:14:47.580 behind the pubic bone. OK, so we've zoomed all 00:14:47.580 --> 00:14:49.639 the way in on the fetus. Let's zoom back out 00:14:49.639 --> 00:14:52.279 to the mother. Because the third trimester is, 00:14:52.299 --> 00:14:55.779 frankly, physically miserable. Oh, it's so uncomfortable. 00:14:55.960 --> 00:14:59.080 Right. But as a nurse, how do you triage a patient 00:14:59.080 --> 00:15:01.519 who just feels awful all the time to separate 00:15:01.519 --> 00:15:05.320 expected normal misery from a lethal danger sign? 00:15:05.399 --> 00:15:07.519 This is where your clinical judgment literally 00:15:07.519 --> 00:15:10.379 saves lives. You must memorize the high -yield 00:15:10.379 --> 00:15:13.120 red flags that require immediate reporting. What's 00:15:13.120 --> 00:15:16.360 on that list? These are visual changes. A severe 00:15:16.360 --> 00:15:19.220 persistent headache, sudden weight gain, facial 00:15:19.220 --> 00:15:21.860 or periorbital edema, which is swelling around 00:15:21.860 --> 00:15:25.220 the eyes, vaginal bleeding, and decreased fetal 00:15:25.220 --> 00:15:28.019 movement. Missing these signs leads directly 00:15:28.019 --> 00:15:30.960 to maternal or fetal death from conditions like 00:15:30.960 --> 00:15:33.799 preeclampsia, placental abruption, or severe 00:15:33.799 --> 00:15:38.139 fetal hypoxia. Yes, it's zero joke. Let's talk 00:15:38.139 --> 00:15:40.179 about the swelling for a second, because swelling 00:15:40.179 --> 00:15:43.570 is incredibly common in pregnancy. Why is ankle 00:15:43.570 --> 00:15:46.029 swelling totally expected, but facial swelling 00:15:46.029 --> 00:15:48.370 is a massive red flag? It comes down to the underlying 00:15:48.370 --> 00:15:51.450 mechanism. Normal, expected, dependent edema 00:15:51.450 --> 00:15:54.090 in the ankles is just gravity. Just fluid pooling. 00:15:54.169 --> 00:15:56.830 Right. The heavy uterus impedes blood return 00:15:56.830 --> 00:15:59.149 from the legs, and fluid just pools in the feet 00:15:59.149 --> 00:16:01.629 after a long day of standing. But facial swelling 00:16:01.629 --> 00:16:04.690 from preeclampsia is caused by vascular endothelial 00:16:04.690 --> 00:16:06.470 damage. So the vessels themselves are broken? 00:16:06.549 --> 00:16:09.049 Yes. The blood vessels are damaged and actively 00:16:09.049 --> 00:16:11.129 leaking protein and fluid everywhere in the body, 00:16:11.289 --> 00:16:13.629 including the face and the hands. That generalized 00:16:13.629 --> 00:16:16.370 edema is a siren, not just a symptom. So ankles 00:16:16.370 --> 00:16:19.409 fine, face bad. Exactly, because face means vascular 00:16:19.409 --> 00:16:21.309 leakage. Another thing that sounds miserable 00:16:21.309 --> 00:16:24.450 is the shortness of breath. When is that normal? 00:16:24.669 --> 00:16:27.230 Expected shortness of breath happens in the third 00:16:27.230 --> 00:16:29.850 trimester simply because the growing uterus is 00:16:29.850 --> 00:16:32.049 physically pressing up against the diaphragm. 00:16:32.230 --> 00:16:34.990 It gives the lungs less room to expand. But when 00:16:34.990 --> 00:16:37.909 is it an emergency? If the dyspnea is sudden, 00:16:38.049 --> 00:16:40.590 severe, and accompanied by chest pain, you must 00:16:40.590 --> 00:16:43.909 immediately suspect a pulmonary embolism. Pregnancy 00:16:43.909 --> 00:16:46.389 is a hypercoagulable state, meaning the blood 00:16:46.389 --> 00:16:49.090 clots weigh more easily. So pulmonary embolisms 00:16:49.090 --> 00:16:52.330 are a major cause of maternal mortality. Okay, 00:16:52.330 --> 00:16:55.159 what about contractions? How do you teach a mother 00:16:55.159 --> 00:16:56.820 to tell the difference between Braxton Hicks 00:16:56.820 --> 00:16:59.360 and true labor so she isn't rushing to the ER 00:16:59.360 --> 00:17:01.220 every single night in a panic? You teach the 00:17:01.220 --> 00:17:02.940 hydration and rest test. How does that work? 00:17:03.080 --> 00:17:05.460 If a patient is having contractions, instruct 00:17:05.460 --> 00:17:08.359 them to drink a large glass of water, empty their 00:17:08.359 --> 00:17:11.299 bladder, and rest on their left side. If it is 00:17:11.299 --> 00:17:13.980 false labor Braxton Hicks, the contractions will 00:17:13.980 --> 00:17:17.230 eventually space out and stop. Braxton Hicks 00:17:17.230 --> 00:17:19.470 are just the uterus practicing. And true labor. 00:17:19.710 --> 00:17:21.569 True labor does not care if you sit down and 00:17:21.569 --> 00:17:24.309 drink water. True labor contractions will persist. 00:17:24.490 --> 00:17:27.109 They'll get closer together and grow stronger 00:17:27.109 --> 00:17:29.710 regardless of what the mother does. They cause 00:17:29.710 --> 00:17:33.230 actual cervical change. True labor doesn't care 00:17:33.230 --> 00:17:35.630 about your water glass. That's a great anchor. 00:17:36.369 --> 00:17:38.150 And what about fetal movement? How does the mother 00:17:38.150 --> 00:17:40.809 track that at home? Teach the count to 10 method. 00:17:40.990 --> 00:17:43.609 The patient should sit quietly and count fetal 00:17:43.609 --> 00:17:46.269 movements. They should feel 10 kicks or movements 00:17:46.269 --> 00:17:48.609 within a two -hour window. And if they don't? 00:17:48.750 --> 00:17:51.049 If it takes longer than two hours to reach 10, 00:17:51.250 --> 00:17:53.950 they must contact the provider immediately. As 00:17:53.950 --> 00:17:56.910 we discussed earlier with the NST, a hypoxic 00:17:56.910 --> 00:17:59.930 baby stops moving to conserve oxygen. Got it. 00:18:00.210 --> 00:18:02.829 Okay, so the pregnancy is safe. We've distinguished 00:18:02.829 --> 00:18:05.390 the danger signs and now we're prepping for the 00:18:05.390 --> 00:18:08.029 actual arrival. the passageway, and the first 00:18:08.029 --> 00:18:10.170 meal. Let's look at the pelvic passageway first. 00:18:10.450 --> 00:18:12.950 The most important high -yield fact here involves 00:18:12.950 --> 00:18:16.009 pelvic shapes. The gynecoid pelvis is the typical 00:18:16.009 --> 00:18:18.490 female pelvis shape, and it is by far the most 00:18:18.490 --> 00:18:21.170 favorable for a spontaneous vaginal birth. Gynecoid, 00:18:21.289 --> 00:18:24.529 so G for go for a vaginal delivery. Perfect memory 00:18:24.529 --> 00:18:26.670 trick. And how do we know if the pelvis is actually 00:18:26.670 --> 00:18:29.589 large enough for the baby? The provider assesses 00:18:29.589 --> 00:18:32.309 the diagonal conjugate. That is the most useful 00:18:32.309 --> 00:18:34.829 manual measurement for estimating the true size 00:18:34.829 --> 00:18:37.619 of the pelvic inlet. and if it's too small. If 00:18:37.619 --> 00:18:40.160 there is cephalopelvic disproportion, meaning 00:18:40.160 --> 00:18:43.259 the baby's head is simply too big for that specific 00:18:43.259 --> 00:18:46.900 pelvis, it will arrest labor and require a cesarean. 00:18:46.920 --> 00:18:49.579 You can't force it. Now let's talk about feeding 00:18:49.579 --> 00:18:52.519 the baby once it arrives. Breastfeeding versus 00:18:52.519 --> 00:18:55.160 formula. Both are completely valid, but they 00:18:55.160 --> 00:18:57.119 have very different nursing implications that 00:18:57.119 --> 00:19:00.259 you'll be tested on. Breast milk contains IgA. 00:19:00.440 --> 00:19:02.920 which provides vital passive immunity to the 00:19:02.920 --> 00:19:05.200 newborn. And from the maternal side. The physical 00:19:05.200 --> 00:19:07.819 act of breastfeeding promotes uterine involution, 00:19:08.059 --> 00:19:10.119 which is the rapid shrinking of the uterus back 00:19:10.119 --> 00:19:12.559 to its pre -pregnancy size. Oh, because nipple 00:19:12.559 --> 00:19:15.299 stimulation triggers the natural release of oxytocin, 00:19:15.440 --> 00:19:17.980 right? Exactly. Oxytocin forces the uterus to 00:19:17.980 --> 00:19:20.980 contract. Because of this, an expected normal 00:19:20.980 --> 00:19:23.799 finding for a new mom who is breastfeeding is 00:19:23.799 --> 00:19:26.519 mild to moderate uterine cramping. So they shouldn't 00:19:26.519 --> 00:19:28.710 panic if they cramp while feeding. Not at all. 00:19:28.930 --> 00:19:31.390 It is just the oxytocin doing its job to clamp 00:19:31.390 --> 00:19:33.569 down on the blood vessels and prevent postpartum 00:19:33.569 --> 00:19:36.410 hemorrhage. What about formula feeding? I feel 00:19:36.410 --> 00:19:40.109 like preparing infant formula requires like laboratory 00:19:40.109 --> 00:19:42.549 level precision. It absolutely does. And this 00:19:42.549 --> 00:19:45.109 brings us to a massive exam trap regarding patient 00:19:45.109 --> 00:19:49.059 education. formula requires incredibly strict 00:19:49.059 --> 00:19:52.279 preparation safety. A highly concerning finding 00:19:52.279 --> 00:19:55.720 is a caregiver watering down baby formula to 00:19:55.720 --> 00:19:58.160 make the supply last longer or you know to save 00:19:58.160 --> 00:20:00.700 money. Why is watering it down so lethal? I mean 00:20:00.700 --> 00:20:02.339 it seems like it would just make the baby a little 00:20:02.339 --> 00:20:05.259 hungrier. Oh, it alters the sodium balance in 00:20:05.259 --> 00:20:08.240 the blood. A neonate's kidneys are immature and 00:20:08.240 --> 00:20:10.819 they simply cannot handle excess free water. 00:20:11.480 --> 00:20:14.940 Improper formula dilution leads to severe hypernatremia 00:20:14.940 --> 00:20:17.160 low sodium. Which causes what? It causes brain 00:20:17.160 --> 00:20:19.599 swelling, seizures, and fatal water intoxication. 00:20:20.160 --> 00:20:22.079 Instructors will absolutely test your ability 00:20:22.079 --> 00:20:24.720 to intervene here. If a parent states they add 00:20:24.720 --> 00:20:26.880 extra water to the formula, you must step in 00:20:26.880 --> 00:20:29.380 immediately and provide strict re -education. 00:20:29.539 --> 00:20:31.200 That is so important. We also need to educate 00:20:31.200 --> 00:20:33.819 them on temperature safety, right? Yes, teach 00:20:33.819 --> 00:20:37.000 caregivers to never microwave bottles. Microwaves 00:20:37.000 --> 00:20:39.700 heat fluids unevenly, creating these hidden hot 00:20:39.700 --> 00:20:42.000 spots that can severely burn the infant's mouth 00:20:42.000 --> 00:20:44.920 and esophagus. You always warm bottles in a bowl 00:20:44.920 --> 00:20:47.759 of warm water. Wow. We have covered incredible 00:20:47.759 --> 00:20:50.460 ground today, from the very first miss period 00:20:50.460 --> 00:20:52.880 all the way to prepping the baby's first meal. 00:20:53.339 --> 00:20:55.900 So if our listener only takes five things into 00:20:55.900 --> 00:20:58.759 their exam, what are the absolute priority anchors? 00:20:58.859 --> 00:21:01.759 Okay, here we go. Number one, Nibelge's rule. 00:21:01.980 --> 00:21:05.359 minus a season plus a week. Subtract three months, 00:21:05.680 --> 00:21:08.119 add seven days, and add one year to the LMP. 00:21:08.259 --> 00:21:12.599 Got it. Number two, RH incompatibility. R -negative 00:21:12.599 --> 00:21:15.539 mothers get anti -D immune globulin at 28 weeks 00:21:15.539 --> 00:21:17.279 and after birth to prevent them from building 00:21:17.279 --> 00:21:20.039 a SWAT team of antibodies. Never, ever give it 00:21:20.039 --> 00:21:21.980 to an R -age positive mother. Right, that's the 00:21:21.980 --> 00:21:24.259 big trap. Number three. Number three. CVS is 00:21:24.259 --> 00:21:26.240 done early but cannot detect neural tube defects 00:21:26.240 --> 00:21:27.940 because there is no amniotic fluid involved. 00:21:28.420 --> 00:21:30.960 Amniocentesis can. Check. Number four. A reactive 00:21:30.960 --> 00:21:33.640 NST means two accelerations of 15 beats per minute 00:21:33.640 --> 00:21:36.240 for 15 seconds. Combined with a BPP score of 00:21:36.240 --> 00:21:38.579 8 to 10, it means you have a happy, well -oxygenated 00:21:38.579 --> 00:21:41.569 baby. And number five. Number five. Dependent 00:21:41.569 --> 00:21:44.869 ankle edema is normal gravity, but facial edema 00:21:44.869 --> 00:21:47.890 and severe headaches are vascular leakage. They 00:21:47.890 --> 00:21:51.609 are priority preeclampsia red flags. Report them 00:21:51.609 --> 00:21:53.769 immediately. That is the 20 % of effort that 00:21:53.769 --> 00:21:57.240 will yield 80 % of the results on exam day. But 00:21:57.240 --> 00:21:59.220 before we sign off, I know you have one final 00:21:59.220 --> 00:22:01.720 provocative thought for us, something that pushes 00:22:01.720 --> 00:22:04.059 our clinical judgment beyond just the textbook. 00:22:04.400 --> 00:22:07.059 I do. We spend a lot of time talking about teratogens 00:22:07.059 --> 00:22:10.960 and that 17 to 56 day danger window. But emerging 00:22:10.960 --> 00:22:13.140 research now shows that environmental teratogens 00:22:13.140 --> 00:22:15.640 and pollutants can cause irreversible epigenetic 00:22:15.640 --> 00:22:18.440 changes to a developing embryo days before a 00:22:18.440 --> 00:22:20.920 patient even misses her period or realizes she 00:22:20.920 --> 00:22:23.000 might be pregnant. Wait, really? Days before? 00:22:23.160 --> 00:22:25.980 Yes. So as future nurses, how does that complete? 00:22:25.869 --> 00:22:27.349 completely change the way we view public health. 00:22:27.410 --> 00:22:29.650 How does it change routine preconception counseling 00:22:29.650 --> 00:22:32.150 for anyone of childbearing age long before they 00:22:32.150 --> 00:22:34.730 ever set foot in an OB clinic? It really makes 00:22:34.730 --> 00:22:36.549 you realize that by the time you're looking for 00:22:36.549 --> 00:22:39.309 that jagged white line on an x -ray or, you know, 00:22:39.329 --> 00:22:42.250 doing that very first prenatal ultrasound, so 00:22:42.250 --> 00:22:44.750 much of the foundational blueprint has already 00:22:44.750 --> 00:22:47.690 been laid in the dark. Keep those critical thinking 00:22:47.690 --> 00:22:50.230 skills sharp. Trust your clinical judgment and 00:22:50.230 --> 00:22:51.869 we will catch you on the next deep dive.