Chapter 15: Pre-Existing Conditions in Pregnancy

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Welcome back to The Deep Dive, where we take the densest academic material and distill it into immediately useful high -impact knowledge.

Today, we are taking on a challenge that really defines maternal child nursing care, and that is chronic illness coexisting with pregnancy.

Right.

Our dedicated listener, the learner, submitted Chapter 15,

Pregnancy at Risk, Pre -existing Conditions from Perry's Maternal Child Nursing Care in Canada.

And this is not just a chapter.

It's really a critical skill set roadmap.

For most people, pregnancy is a natural physiological process.

But the moment you introduce a chronic condition like

diabetes,

cardiac disease,

or an autoimmune disorder, that normal event just instantly transforms.

It becomes a period that demands really sophisticated clinical management and

meticulous guidance.

Absolutely.

And the nursing role here shifts so dramatically.

You're no longer just an educator or a supporter.

You become a central manager, a vigilant monitor, and really the primary patient advocate navigating this very, very complex intersection of diseases.

The text is really clear.

The core mission for the entire interprofessional team is fostering as normal a pregnancy experience as possible.

Right, while still applying these strict protocols to manage the very unique maternal and fetal needs.

Precisely.

So this deep dive, we have to cover metabolic crises, the severe demands placed on the cardiovascular system,

the delicate balance of neurological disorders.

And also the really critical socio -medical challenges like HIV management and substance use.

The goal for any nursing student listening is to understand not just the disease itself, but how pregnancy alters the disease and how we use our clinical assessment tools, our tables, our functional classifications to keep the patients safe.

Okay, let's start with what is arguably the most common chronic illness affecting pregnant people today.

Pregestational diabetes mellitus, or PGDM.

Right.

And this classification, it includes type 1 and what we're seeing more and more of in Canada, type 2 diabetes diagnosed prior to conception.

So we have to begin with the fundamentals of pathogenesis because that really dictates all the risks that come later, doesn't it?

It does.

Diabetes is defined by the body's inability to maintain euglycemia, normal blood sugar, because of defective insulin secretion or insulin action or sometimes both.

So we break down those classic symptoms, polyuria, polydipsia, and polyphagia.

We can really see the mechanics of uncontrolled glucose at work.

Exactly.

Hyperglycemia just means glucose is piling up in the bloodstream.

And because glucose is such a huge molecule, it sort of pulls water with it through osmosis.

Okay, so that leads to hyperosmolarity in the blood.

Right.

And that hyperosmolarity forces the kidneys to excrete massive amounts of glucose and that just drags fluid out of the body.

That's your hallmark, polyuria or excessive urination and glycosuria.

And then the cellular dehydration that follows, that's what triggers the excessive thirst, the polydipsia.

Okay, and the third polyphagia, the excessive hunger.

Where does that come from?

That comes from the body trying to compensate for the fact that even though it's swimming in glucose, the cells can't actually use it, not without insulin.

So it's basically a state of cellular starvation.

It is.

It forces the body to break down fat and muscle tissue for fuel instead.

And that breakdown of fat is what leads to the production of ketones.

And fatty acids.

Yeah, that's what sets the stage for ketoacidosis.

But even before pregnancy complicates things, we know that diabetes causes long -term structural damage.

Like the microvascular changes that lead to retinopathy and nephropathy.

Exactly.

And the macrovascular changes that are responsible for that increased cardiovascular risk.

So this system is already compromised when this physiological tidal wave of pregnancy hits.

So let's unpack this incredible metabolic war that happens in the pregnant body.

Why does the pregnant body naturally create insulin resistance?

It just seems so counterproductive.

It's actually entirely strategic.

It's a mechanism to make sure the fetus, which relies completely on maternal glucose for fuel, gets everything it needs.

Okay.

Glucose crosses the placenta through carrier -mediated facilitated diffusion.

So fetal glucose levels are a mere image of maternal levels.

But here's the crucial distinction for the nurse, right?

Insulin.

Right.

Insulin does not cross the placenta.

By about week 10, the fetus starts making its own.

And that's why maternal hyperglycemia leads directly to fetal hyperinsulinism.

Now let's talk about the shifts because the first trimester is a danger zone for the mother, but in a way you wouldn't expect.

Correct.

The early influence of rising estrogen and progesterone actually increases insulin production.

It promotes glucose use in the periphery.

So her blood glucose levels actually fall.

They do.

The patient with PGDM is at a much higher risk of hypoglycemia during that first trimester.

Which is often made worse by nausea and vomiting, which disrupts eating patterns.

Exactly.

A dose reduction of insulin is often necessary then.

But then, late in the second and third trimesters, the tide just flips completely, and we enter what the text calls the diabetogenic effect.

This is the physiological crescendo.

Placental hormones.

You've got human chorionic somatomamotropin or HCS, estrogen, progesterone, cortisol, and this enzyme called insulinase.

They all act as powerful insulin antagonists.

They create this intense insulin resistance.

So the maternal body is basically shunting glucose away from the mother's cells and just pushing it toward the fetus.

That's a perfect way to put it, yes.

So her insulin requirements just steadily climb.

They can double or even triple, peaking around 37 weeks.

They do.

And if you imagine that visual map of changing insulin needs from the text, it looks like a steep mountain climb in that third trimester.

It just shows you how frequent and significant those dose adjustments have to be.

And that map shows the most critical moment of all.

The immediate cliff drop.

The second the placenta is expelled, the source of all those antagonistic hormones is gone.

Insulin requirements just plummet instantly.

It often means you need to do an immediate 50 % or even more reduction in the dose.

And for a non -breastfeeding mother, those pre -pregnancy insulin needs, they typically come back within what, 7 to 10 days?

Usually, yeah.

But for the breastfeeding mother, that risk of hypoglycemia persists because lactation itself uses up maternal glucose.

That's a huge counseling point.

So those lower insulin requirements, sometimes 25 % below pre -pregnancy levels, they continue until she weans.

That's right.

The emphasis on preconception counseling, I mean, it cannot be overstated.

No.

Organizations like the CDA and SOGC, they mandate this.

The core mandate is to optimize glycemic control before conception and start a high dose folate, one milligram per day.

And the reason is all about timing.

Right.

It's all about timing.

Strict metabolic control during the first 8 to 12 weeks, that's the period of organogenesis.

It's the single greatest factor in decreasing the risks of major congenital anomalies and spontaneous abortion.

So if control is poor during that really narrow window, the risk of disaster is just exponentially higher.

It is.

And to guide this, nurses use the glycemic targets as their clinical compass.

Before pregnancy, the A1C should be less than 7%.

And during pregnancy.

It's aggressive.

The target for A1C is at or below 6 .0 % if you can get there safely.

And that A1C is like the patient's diabetic report card, right?

It shows average glucose control over the last few months.

It is.

And achieving an A1C of 6 .0 % requires an intensity of management that's

often compared to critical care, but it's being implemented in the patient's home life.

It's incredibly difficult.

So beyond the congenital anomalies, we then face later maternal complications like macrosomia.

Right.

Infants born over 4 ,000 to 4 ,500 grams.

This happens in up to 40 % of PGGM pregnancies.

And these infants, because of that fetal hyperinsulinism, acting like a growth hormone, they tend to have disproportionately large shoulders and trunks.

Which severely increases the risk of shoulder dystocia during a vaginal birth, and that leads directly to higher C -section rates.

We also see a high rate of hypertensive disorder, something like 15 to 30%.

And for patients with pre -existing vascular disease, chronic hypertension can affect up to 40 % of them.

And this is why that low -dose aspirin prophylaxis starting for 16 weeks is such essential counseling to mitigate the risk of developing preeclampsia.

It is.

Another common late trimester complication is hydramnios, or polyhydramnios, just too much amniotic fluid.

The cause is a bit debated, right?

It is, but the prevailing theory links it to maternal and fetal hyperglycemia, driving fetal polyuria.

The fetus is peeing too much.

And hydramnios itself raises the risk of uterine dysfunction, placental abruption, and postpartum hemorrhage.

And finally, infections.

Uncontrolled carbohydrate metabolism it suppresses the immune response.

Right.

So infections like UTIs and mannilial vaginitis are much more frequent.

And you have to remember, an infection is a major physiological stressor that dramatically increases insulin resistance.

It's a primary trigger for ketoacidosis.

Speaking of ketoacidosis, DKA is a life -threatening emergency.

It happens most often when that insulin resistance is peaking in the second and third trimesters.

Right.

And here's where the numbers are so crucial.

What's the difference in the DKA threshold between a pregnant and a non -pregnant patient?

It's massive.

And this is a really high -yield concept for students.

A non -pregnant person usually needs a blood glucose, or BG,

level of around 16 .7 to 19 .5 millimol to go into DKA.

But in pregnancy, because of increased metabolism and a chronic partial compensation,

DKA can happen when BG levels are barely above 11 millimol.

11.

That is an alarmingly low threshold.

It means that simple stresses, a mild flu, missing one insulin dose, a minor infection, it can rapidly trigger this crisis.

And prompt treatment is absolutely non -negotiable.

4 -V fluids, insulin, electrolyte monitoring.

DKA is highly associated with intrauterine fetal death and can induce preterm labor.

So time is just critical.

And on the flip side of that, we have an increased risk of hypoglycemia, especially early in pregnancy or at night.

Yes.

And the essential nursing teaching point here is the risk of loss of hypoglycemic awareness, which you often see in long -standing diabetes.

So the body's crucial autonomic warning signs, the sweating, the rapid pulse, the nervousness, they just become muted.

They do.

And this loss of awareness creates profound safety issues.

Driving is a major one.

The nurse has to relentlessly reinforce strict, frequent monitoring to help the patient manage this and hopefully regain some of those warning signs.

So when a nurse does an assessment, they have to be able to immediately distinguish between low and high sugar.

So we should probably walk through table 15 .1 as a kind of triage guide.

Let's do it.

For hypoglycemia or insulin shock, the onset is rapid.

The symptoms are all driven by that autonomic activation.

Sweating, nervousness, irritability, hunger, a rapid pulse.

And the patient is often clammy and pale.

Yes.

And the intervention is just as rapid.

15 grams of a fast -acting carbohydrate, a small glass of juice, glucose tablets, something like that.

Okay.

And for hyperglycemia, DKA?

The onset is slow.

Hours, sometimes days.

The symptoms are systemic.

Polyuria, that excessive thirst, dry and flush skin.

Abdominal pain, drowsiness,

and that telltale acetone or fruity odor on the breath.

And this requires calling the provider immediately.

Insulin, IV fluids like normal saline.

Right.

And their urine ketones will be positive, which indicates that fat breakdown.

The fetal risks, as we mentioned, are severe, starting with stillbirth, which remains a huge concern with poor maternal control.

And again, that first trimester hyperglycemia is what sets the stage for birth defects.

We see a ten -fold increase in CNS defects, spina bifida, and encephaly.

Wow.

And a five -fold increase in cardiac defects, like ventricular septal defects.

The link between early hyperglycemia and these structural anomalies is one of the strongest arguments for that aggressive preconception planning.

And once we get past that first trimester, the issue shifts to growth.

It does.

The maternal hyperglycemia drives the fetus to secrete excessive insulin.

And this fetal insulin, it acts as a powerful growth factor, causing this widespread excess production of glycogen, protein, and fat.

And that results in the classic macrosomic infant.

Yes.

And these babies aren't just heavy, they're large across the shoulders and the trunk, which leads to birth injuries like brachial plexus palsy, clavicle fractures, facial nerve injury, all of it from mechanical trauma during delivery.

And the final piece of the puzzle is neonatal hyperglycemia.

Right.

The newborn's pancreas is conditioned to produce these massive amounts of insulin to counteract the maternal glucose supply.

So once the cord is cut, that high glucose supply is instantly gone.

But the high insulin output remains.

And that just crashes the newborn's sugar level.

So intensive monitoring and early feeding are mandatory in that immediate postpartum period.

Okay.

So the entire antepartum care plan really revolves around one primary goal, achieving and maintaining euglycemia.

It does.

And nurses have to educate patients on their specific target ranges.

Table 15 .2 gives us the precise numbers that a nurse uses to assess if the patient's insulin regimen and diet are working.

We're looking for a fasting glucose between 3 .8 and 5 .2 millimol.

Right.

And the one -hour postprandial goal is 5 .5 to 7 .7 millimol, with the two -hour postprandial goal being 5 .3 to 6 .6 millimol.

These tight ranges just show how difficult this task really is.

Dietary management is led by the dietitian, but always reinforced by the nurse.

And calorie intake is calculated based on BMI, but the key is distribution.

Three regular meals and at least two snacks.

You have to emphasize that skipping meals, especially going more than four hours without eating, is dangerous.

It just rapidly increases the risk of hypoglycemia.

And that substantial bedtime snack is absolutely essential for stability.

It is at least 25 grams of carbohydrate combined with a protein to prevent that

hypoglycemia and starvation ketosis.

And all food choices should align with Canada's food guide.

Okay.

What about exercise?

It's vital.

30 to 60 minutes daily improves insulin sensitivity.

But, and this is a big, but nurses must be aware of comorbidities.

So if the patient has established vascular disease, like retinopathy or nephropathy.

Then exercise has to be mild, simple walking or swimming.

Intense exercise redistributes blood flow and risks ischemic injury to organs that are already compromised.

And the ultimate tool for self -management is self -monitoring of blood glucose or SMBG.

Right.

Testing frequency is intensive before meals, two hours after meals at bedtime, and sometimes even at 2 a .m.

And the nursing alert here is that post -perennial peaks often occur exactly at that two -hour mark, which makes that second post -meal measurement so crucial for adjusting the dose.

It is.

And nursing education has to include that what to do when illness occurs protocol.

Patients have to understand they need to continue their insulin.

In fact, their needs often increase with illness.

Increase fluid intake.

And most importantly, seek help immediately if their BG goes over 11 .0 millirel and they have urine ketones.

They should never try to manage significant hyperglycemia and ketosis at home.

And regarding insulin therapy,

almost every PGEm patient needs insulin during pregnancy, even if they were managed on oral agents before.

Yeah, the constant physiological shifts mean the regimen changes frequently, sometimes daily.

When we're reviewing insulin pharmacology, we're really focusing on the difference in action.

Right.

The rapid -acting analogs like Lisbro or Aspart are preferred because their short duration minimizes the risk of prolonged hypoglycemia.

And then long -acting analogs like Glargine or Dedimir, they're used to mimic basal insulin secretion and are considered safe.

We should also describe the continuous subcutaneous insulin infusion systems, the pumps.

We should.

They use rapid -acting insulin delivered through a thin catheter, and they offer a precise basal rate plus on -demand boluses.

They can give superb glycemic control, but they require a highly motivated patient.

The reliance on technology means that complications like a pump failure or a site infection can lead to rapid hyperglycemia or DKA.

And finally, intense fetal surveillance is required.

Always.

This means frequent ultrasounds for growth monitoring.

And for patients with poor early control, fetal echocardiography is done between 20 and 22 weeks to screen for cardiac defects.

And then daily fetal movement counts or KIT counts start between 26 and 32 weeks with weekly nonstress tests or NSTs, usually starting around 36 weeks.

Or earlier if vascular complications are present.

Moving into labor and delivery, the intrapartum goal remains that tight control, 4 to 7 millimolar per hour.

Right, because hyperglycemia during birth directly risks neonatal hypoglycemia.

Management often involves hourly BG checks and a continuous intravenous insulin infusion.

Which is titrated minute by minute to the current BG level.

Continuous fetal monitoring is standard.

And while vaginal birth is the preference, macrosomia or other obstetrical concerns often mean a C -section is necessary.

The postpartum period is maybe the most exhilarating and terrifying shift for the nurse to manage.

It is.

The insulin requirements drop instantly.

It really is like flipping a switch because the placenta is gone.

Type 2 patients might not require any insulin at all at first, or they might revert to oral agents.

And we have to remember the counseling point.

Breastfeeding utilizes maternal glucose and keeps those insulin needs lower than pre -pregnancy levels.

Which is a powerful, non -pharmacological way to help manage the patient's diabetes long term.

And it promotes anti -diabetogenic effects for the child, which helps break that intergenerational cycle of risk.

And lastly, contraception.

Future pregnancy planning is critical.

Very.

Barrier methods, IUDs, and progestin -only options are favored.

Nurses need to counsel carefully on combined oral contraceptives, or OCs.

They're often controversial for diabetic patients, especially those with existing vascular complications because of that increased risk of thromboembolism.

All right, let's shift gears from metabolic demands to glandular and hemodynamic demands, starting with the thyroid.

Okay.

Hyperthyroidism, which is usually caused by Grave's disease, is tricky.

It's classic symptoms fatigue, increased heart rate, heat sensitivity.

They overlap perfectly with normal pregnancy symptoms.

So diagnosis really hinges on blood work.

Right.

Elevated T4 and T3 and a suppressed thyroid stimulating hormone, or TSH.

Untreated hyperthyroidism is dangerous.

It risks low birth weight, IUGR, stillbirth, and preeclampsia.

Which requires the same low dose aspirin prophylaxis, yes.

And then there's the risk of that terrifying complication, thyroid storm.

Management is medication only.

Radioactive iodine is an absolute contraindication.

It is.

Now, for the critical drug switch that nursing students must grasp,

propylethyuracil, or PTU, is the agent of choice during the first trimester.

Okay, why is that?

Because it poses a lower risk of teratogenicity during organogenesis than the other main drug, methamazole, or MM.

But PTU carries its own rare risk of severe liver damage.

It does, hepatotoxicity.

So once the first trimester is complete, the patient should switch to MM for the rest of the pregnancy.

This constant juggling act between medication safety and fetal development is really the essence of managing chronic disease in pregnancy.

And we have to highlight the nursing alert, thyroid storm.

You have to recognize it instantly.

It's triggered by severe stress or infection.

You're looking for a sudden dramatic spike in fever, profound tachycardia, hypotension, vomiting, and mental status changes like restlessness or stupor.

And treatment is rapid.

Immediate.

Four fluids, oxygen, high doses of PTU, and antipyretics.

Okay, moving to hypothyroidism.

Often Hashimoto's disease.

Again, the symptoms mimic pregnancy,

fatigue, weight gain, cold intolerance.

And the diagnosis is an elevated TSH, usually above 6MUL.

The fetal risk here is profound because early in gestation, the fetus is completely dependent on maternal T4 for its neurological development.

Right.

So untreated or poorly managed hypothyroidism risks preeclampsia, placental abruption, spontaneous loss, and most seriously, that impaired fetal neurological development.

The treatment is simple.

Leave a thyroxine replacement.

It's safe.

It's non -teratogenic.

It is.

However, as pregnancy progresses and T4 utilization increases, the dosage has to be aggressively increased, sometimes by as much as 50%, to keep the TSH within that normal, tight range that's required for gestation.

And here's a seemingly small but clinically massive nursing alert regarding medication absorption.

Yes, this is so important.

Leave a thyroxine must be taken four hours before or after taking iron supplements like ferrous sulfate or calcium.

Because they drastically inhibit the absorption of the thyroid hormone.

They do.

So if a patient is taking their prenatal vitamin at the same time as their leave a thyroxine, they're essentially taking nothing.

Now the heart.

This is where pregnancy imposes its most intense physiological challenge.

It really is.

Blood volume and cardiac output surge by 30 to 50%.

And that peaks early, between 20 and 26 weeks.

A heart that's already weakened by disease is just intensely challenged by the sudden demand.

The standard guide and the clinical language nurses have to use is the New York Heart Association Functional Classification, the NYHA.

Right.

The system classifies the patient's functional capacity from class one, which is no symptoms, no limitation, all the way up to class Thor, with symptoms at rest and an inability to perform any activity.

And the crucial point is that a patient might be class I before pregnancy and then rapidly deteriorate to class three during those peak cardiac output weeks.

Exactly.

And the text highlights the extreme risks in box 15 .2.

Patients in group three face maternal mortality rates of 25 to 50%.

That's staggering.

It is.

This group includes catastrophic conditions like pulmonary hypertension, Marfan syndrome with aortic involvement, and Eisenmenger syndrome.

For these patients, pregnancy carries such a high fatality risk that it's generally contraindicated.

Looking at specific conditions, mitral valve stenosis, often from rheumatic heart disease, is extremely problematic.

Yes.

The narrowing obstructs blood flow.

And that massive fluid increase during pregnancy can easily trigger pulmonary edema, atrial fibrillation, and heart failure, especially in class three or five outpatients.

So management focuses on reducing cardiac workload.

Mandatory rest, sodium restriction, diuretics, beta blockers.

And intrapartum, the primary goal is preventing tachycardia and hypotension.

An epidural is preferred.

And the second stage of labor is actively shortened using an assisted delivery, like forceps or vacuum, to minimize maternal pushing and cardiac strain.

We should also address patients with valve replacements.

They face a clinical paradox because of their anticoagulation needs.

They do.

Pregnancy is a hypercoagulable state, so they need anticoagulation to prevent valve thrombosis.

But the standard therapy, warfarin, carries teratogenic risks, especially during that first trimester organogenesis period.

So this forces a complicated clinical bridge.

Right.

Often, low molecular weight heparin, or lovinox, is used during that critical first trimester.

Then they might switch back to warfarin in the second and third, and then back to heparin near delivery.

It's a logistical nightmare that requires intensive patient education.

It is.

But crucially, warfarin is considered safe for breastfeeding.

And we can't overlook peripartum cardiomyopathy, or PPCM.

No.

Heart failure with an unknown cause, occurring late in pregnancy or up to six months postpartum.

Mortality is tragically high, 25 to 50 percent.

And if the heart remains enlarged six months after birth, the recurrence risk in a subsequent pregnancy is 30 to 50 percent.

Which leads to counseling that generally advises against future pregnancies.

It does.

So nursing care for the cardiac patient is all about vigilance and prevention.

It is.

Antipartum, the period of greatest stress, is 25 to 30 weeks.

The nurse has to relentlessly educate on avoiding stressors, infections, anemia, emotional stress, excessive weight gain.

And Box 15 .3 and the teaching guide are vital here for recognizing signs of cardiac decompensation.

They are.

Subjectively, the patient might complain of increasing fatigue, a feeling of being smothered, or frequent palpitations.

And objectively, the nurse is assessing for a pulse rate consistently over 100, a respiratory rate over 25, crackles at the base of the lungs, and any signs of cyanosis.

Promoting cardiac function means rest is mandatory.

10 hours of sleep nightly for Class 1 and 2 patients, and bed rest for those in Class 3 and 4.

And we also have to teach the importance of preventing the Valsalva maneuver straining during defecation or pushing during labor.

Yes, because that dramatically increases intratheorastic pressure and overloads a compromised heart.

And intrapartum care is about tight control.

Strict IV fluid management, preventing both maternal tachycardia, a pulse over 110, and hypotension.

And the nursing alert here is clear.

A pulse over 100, or a respiratory rate over 25 with dyspnea, is a huge red flag for impending ventricular failure.

Strategies include favoring the sideline position to maximize cardiac output and oxygenation.

And an epidural is strongly encouraged because it shortens labor and reduces oxygen consumption, but the nurse has to be vigilant to prevent the hypotensive side effect that's so common with epidurals.

And in terms of medication, we avoid beta -adrenergic agents like tributylene because of the tachycardia risk.

We do.

And postpartum, for hemorrhage control, ergot products like methadrine are contraindicated.

They can cause severe hypertension and bronchospasm, which is just detrimental to a patient with fluid -sensitive lungs.

The postpartum period is often called the most hazardous time, the first 24 to 72 hours.

Why is that?

Because after the uterus contracts and the placental circulation is gone, all that extravascular fluid rapidly remobilizes back into the vascular system.

The sudden fluid shift can overwhelm a diseased heart.

Which might require aggressive diuretic therapy and intensive monitoring.

Absolutely.

And assistance with newborn care is crucial to conserve the mother's energy.

Okay, moving now into a variety of other high -risk conditions that demand specialized nursing expertise, and we'll start with a rapidly growing demographic challenge.

Obesity.

Right.

Obesity is classified using BMI.

Overweight is 25 or more, obese is 30 or more, and severely obese is 40 or more.

The physiological effects of pregnancy are just amplified in these patients.

That large amount of adipose tissue,

it proportionally increases blood volume and cardiac output.

So it's increasing the underlying cardiac workload.

It is.

Plus, the sheer size of the abdomen increases the risk of aortic oval compression.

And during surgery or labor, delayed gastric emptying and decreased cardiac sphincter tone create a much higher risk for regurgitation and aspiration.

The risks across the board are just higher.

spontaneous abortions, stillbirth.

Which is nearly three times higher if the BMI is over 35 after 28 weeks.

Plus, GDM and hypertensive disorders, which is why low -dose aspirin is recommended as a prophylaxis again.

And from a practical nursing standpoint, the need for specialized care and equipment is non -negotiable.

It is.

Bariatric appropriate equipment, large BP cuffs, reinforced beds, lifts, or R tables, they have to be available.

And nurses must adhere strictly to work safe procedures, using mechanical assistance for all patient movement, never manual lifting.

And assessing fetal anatomy via ultrasound is often significantly impaired.

Yes, requiring repeated specialized imaging.

Okay, let's talk about anemia, the most common medical disorder of pregnancy.

It is.

It's defined as a hemoglobin, or Hb, less than 110 GO.

The risk is that the reduced oxygen carrying capacity forces the heart to compensate by increasing cardiac output, which adds massive stress.

And severe anemia and Hb less than 60 risks poor fetal outcomes.

Right.

The vast majority, 75%, is iron deficiency anemia.

Prevention is a prenatal vitamin with 30 mg a day of iron.

Treatment often requires higher doses, 60 to 120 mg a day, or even IV iron if oral iron isn't tolerated.

And this leads us to the critical distinction of sickle cell disease, or SCD.

Yes.

SCD patients are not iron deficient, and the nurse has to make sure they avoid routine iron supplementation, including most standard prenatals, because of the high risk of iron overload.

SCD, with its characteristic sickling of red cells, makes patients prone to vaso -occlusion.

Resulting in painful crises?

Yeah, often triggered by dehydration, hypoxia, or acidosis.

Pregnancy risks include IUGR, preeclampsia, and postpartum infection.

So management during a crisis is focused on analgesia, oxygen, and hydration.

Right.

Intrapartum, the patient should be side -lying, get supplemental oxygen, and regional anesthesia is preferred.

And critically, oral contraceptives are contraindicated postpartum for SCD patients, because they compound the already high risk of thromboembolism.

Let's discuss pulmonary issues.

Asthma is the most common pulmonary disease in pregnancy.

It is.

And the goal is simple, but vital.

Maintain adequate fetal oxygenation by preventing maternal hypoxia.

So medication compliance is key.

It is.

Current guidelines stress that the risk of an acute asthma exacerbation causing fetal hypoxia far outweighs the risks of continuing standard therapy, like inhaled corticosteroids.

So intrapartum, they continue their meds, and if they're on chronic oral corticosteroids, they need stress doses.

Exactly.

And nurses have to remember the critical contraindication postpartum.

For hemorrhage, we must avoid carboprost or hemabate and ergonovine.

They're known to cause severe bronchospasm in susceptible patients.

Okay, what about cystic fibrosis, or CF?

That's an autosomal recessive disorder that poses unique challenges.

Pregnancy is only really well tolerated if the patient enters conception with excellent nutritional status and mild lung disease.

The high risks include chronic hypoxia, pulmonary infections, GDM, IUGR, and preterm births.

So the nursing focus starts early, with pre -contemption weight optimization.

Right, aiming for 90 % of ideal body weight.

Because of pancreatic insufficiency, nutritional support is paramount during pregnancy, often requiring high -calorie tube feeding at night.

Infection prevention and aggressive management of pulmonary function are just continuous priorities.

Let's touch on integumentary issues quickly.

The crucial nursing alert here concerns the medication isotretinoin, or accutane.

Yes, used for severe acne.

It is intensely teratogenic.

It causes defects like hydrocephaly and cardiac anomalies, and it must be avoided both pre -conception and during pregnancy.

We also have intrahepatic colostasis of pregnancy, or ICP.

The most common liver disease, usually presenting in the third trimester, with generalized, intense parietus, especially on the palms and soles.

There are no lesions, but the bile acid levels are dangerously high.

And the major risks here are fetal.

They are stillbirth, asphyxia, and preterm birth.

Treatment is ursodeoxycholic acid.

Fetal surveillance is frequent, often twice -weekly, NSTs until delivery, and the symptoms resolve completely after birth.

Okay, moving to epilepsy, the most common neurological disorder.

This presents a massive clinical dilemma.

It does.

The goal is seizure control.

Because uncontrolled tonic -clonic seizures carry a greater risk of fetal hypoxia and maternal trauma than the medication itself.

We aim for the lowest effective dose, preferably monotherapy.

But the nurse has to be acutely aware of the risks.

While newer agents like lamatrigine and leviterum have lower malformation rates, the major safety alert involves valproic acid, or epivol.

Right.

It carries the highest congenital anomaly risk, and must be strictly avoided during the first trimester.

It requires really careful management if a patient has to take it later in pregnancy.

And we also counsel on sudden unexpected death in epilepsy, or SOYIDI.

Yeah, which can be linked to uncontrolled seizures, apnea, and cardiac rhythm issues.

The best prevention strategy involves strict medication adherence and ensuring adequate sleep, as sleep deprivation can be a major seizure trigger.

A unique muscular challenge is myasthenia gravis, or MG.

An autoimmune disease causing muscle weakness.

Flares are most common in the first trimester and postpartum.

Critically, the nursing alert here is absolute.

Magnesium sulfate must not be administered.

Why that?

Magnesium inhibits acetylcholine release, which is already compromised in MG, and it can rapidly trigger a life -threatening myasthenic crisis.

So vaginal birth is generally preferred for MG patients?

It is, although assistance like vacuum or forceps may be needed as the mother's pushing strength wanes.

We also note that 10 -20 % of infants born to mothers with MG will experience a transient neonatal myasthenia.

Pregnancy in a patient with a spinal cord injury presents a unique set of management problems, and none more urgent than autonomic dysreflexia, or AD.

AD is a dangerous, acute, and uncontrolled hypertensive crisis.

It happens when a painful or noxious stimulus below the level of the injury -like uterine contractions of full bladder or constipation.

It triggers this massive runaway sympathetic nervous system response that the brain can't regulate.

The risk is highest for patients with lesions above T6.

So the nursing strategy is all about prevention and immediate recognition?

It is.

Vaginal birth is preferred.

Induction might be considered if the patient has a high -level injury and can't perceive contractions, meaning they might present late in labor.

And regional anesthesia and epidural is vital?

It's vital because it blocks the sensory input below the injury, and that prevents AD entirely.

Postpartum, bladder management is paramount to prevent urinary retention, another major AD trigger.

And what about breastfeeding?

Nurses need to counsel patients with high -level SCI, T6 and above, that they may lack the innervation for the milk letdown reflex and can risk triggering AD during the act of breastfeeding.

The deep dive into HIV management in pregnancy is genuinely one of the most successful public health triumphs of our generation.

It really is.

Perinatal transmission risk in Canada has been reduced so dramatically to less than 2 % entirely because of the sophisticated use of antiretroviral treatment, or ART.

Pre -conception counseling for these patients is critical to ensure they're on a stable triple -RT regime throughout the pregnancy.

It is.

And the mode of birth decision is entirely dictated by the most recent plasma viral load.

The clinical cutoff is clear.

If the plasma viral load is confirmed to be less than 1 ,000 -copy -as -ml,

a vaginal birth is possible.

Right.

The risk of transmission is considered minimal at that point.

However, if the viral load is greater than 1 ,000 copies, or the status is unknown,

then an elective C -section is recommended to reduce fetal exposure to maternal blood and genital secretions.

Box 15 .4 outlines other key risk factors.

Avoiding fetal scout monitoring and ensuring minimal duration of ruptured membranes.

And postpartum, the infant receives oral zetavidine, or ZDV, for up to six weeks.

Yes.

And while breastfeeding is encouraged in low -resource settings, in developed countries like Canada, we advise against it.

The transmission risk through milk remains and safe formula alternatives are accessible.

We conclude with substance use, recognizing it as a major public health and social concern.

It is.

And while the safest pregnancy is drug -free for opioid addiction, the current standard of care is not forced abstinence.

It's opioid agonist therapy, or OAT, using methadone or buprenorphine to stabilize the patient and reduce harm.

This is such a complex area, and nurses often encounter huge barriers to care.

Intense stigma, overwhelming guilt, and the very real fear of losing custody of their child.

Right.

So the nurse's primary task is to create a safe space.

And we have to adopt a non -judgmental, trauma -informed, and person -centered approach.

Strictly.

That is the core of the harm reduction philosophy.

The goal is to build trust and connect the patient with accessible community resources.

Without trust, communication fails, and the risks just increase for both mother and child.

So harm reduction means stabilization and reducing risk, even if abstinence isn't immediately achieved.

Exactly.

And counseling has to be comprehensive, covering substances like cannabis, where abstinence during lactation is advised, or at least avoiding breastfeeding within one hour of inhaled use to minimize infant exposure.

The nursing priority immediately postpartum is promoting mother -infant attachment, emphasizing skin -to -skin contact.

Yes.

And breastfeeding is encouraged for mothers who are stable on OAT, given its benefits.

But the care doesn't end at discharge.

Extensive discharge planning, addressing housing, food security, long -term social supports, is absolutely critical for the mother's ability to maintain stability and care for the newborn successfully.

This chapter is a monumental testament to the complexity of maternal child nursing when chronic disease is involved.

It really is.

We have navigated the incredible metabolic demands of diabetes, the fluid dynamics of cardiac disease, and the acute crises of neurological disorders.

And the major theme that connects all these diverse conditions is the need for an integrated, interprofessional approach that's focused on meticulous control and strict adherence to clinical protocols.

The nurse serves as the ultimate coordinator and educator in this high -stakes environment.

Let's crystallize those essential nursing takeaways.

Always remember the dynamic nature of insulin, that critical need to reduce the ghost postpartum, and the life -threateningly low DKA threshold of 11 millimol during pregnancy.

Crucially, recall the NYHA classification.

It's the nurse's compass for assessing cardiac risk.

And know that the first 24 to 72 hours postpartum are the most hazardous time for cardiac decompensation.

Right.

Also, remember that clinical conflict, the importance of patient adherence, whether it's to anticonvulsants because seizure control often outweighs the fetal medication risk or strict adherence to art to prevent HIV transmission.

And finally, never forget the foundational philosophy required for complex socio -medical care.

Always, always employ a trauma -informed harm reduction approach when caring for patients struggling with substance use.

Your non -judgmental stance is often the first step towards successful stabilization.

Which brings us to a final provocative thought.

Considering the incredible accelerating pace of targeted therapies, I mean, think of the new gene -editing techniques for genetic disorders like cystic fibrosis or the next generation of disease -modifying agents for neurological conditions like MS.

Will we reach a point where these chronic conditions can be so effectively managed or mitigated preconception that the majority of fetal risk is eliminated entirely?

That concept moves the focus from managing a high -risk pregnancy to ensuring a low -risk conception.

A fascinating clinical future to ponder.

Thank you for joining us for this deep dive into pregnancy at risk.

We hope this comprehensive breakdown has given you the confidence to apply these critical nursing concepts in your clinical practice.

Thank you, The Learner, for sending in this chapter.

And thank you for tuning in to The Deep Dive.