Chapter 26: Cardiovascular Disorders in Children

Welcome to Last Minute Lecture.

This free chapter overview is designed to help students review and understand key concepts.

These summaries supplement, not replace the original textbook and may not be redistributed or resold.

For complete coverage, always consult the official text.

Hello everyone and welcome back to the studio.

You are listening to The Deep Dive and we are so glad you're here with us.

It's great to be here.

Today we are pointing our lens at something incredibly small, incredibly complex,

and frankly,

incredibly vital.

We're diving into chapter 26 of Introduction to Maternity and Pediatric Nursing.

Yeah.

And we're focusing on the child with a cardiovascular disorder.

It is, it is a heavy chapter, I won't lie to you.

Yeah.

It's one of those topics in pediatric nursing that, you know, it tends to make people nervous.

I can see why.

Because the stakes are just so high.

I mean, we were talking about the engine of life here, but in its most delicate developing form.

And I think for a lot of our listeners, the learners out there, the heart can feel like a plumbing diagram gone wrong.

Right.

You've got pikes, valves, pressures, electricity.

It's a lot to memorize.

It is.

But our mission today isn't just to list terms.

We wanna unpack the actual, you know, the mechanics of the young heart.

The why behind it all.

Yes, the why.

We need to understand how it differs from an adult heart, how to spot when things are going sideways and really how to keep these kids safe.

Right.

And to do that, we have to move beyond just memorizing definitions.

Yeah.

Like you said, we need to understand the why.

Why does a baby turn blue when they cry?

Why do we care so much about a sore throat in a five -year -old?

It all connects back to the anatomy and the physiology.

So let's set the stage.

I was reading through the source material and one thing jumped out at me immediately.

What was that?

The cardiovascular system is the very first system to function in intraterine life.

That's right.

Between the third and eighth week of gestation, that heart is already developing and working.

It's foundational.

So early.

But here is the hook and this is what makes neonatology so fascinating.

Okay.

The cardiovascular system undergoes the most dramatic operational shift of any system in the body, the exact moment a baby is born.

It's the ultimate go live moment.

It really is.

I mean, think about it.

In the womb, the fetus is essentially an aquatic creature.

The lungs are filled with fluid.

They aren't doing the gas exchange.

The mother is doing all the heavy lifting via the placenta.

Okay, so the whole system is built for that environment.

Exactly.

So the fetal circulation is designed to bypass the lungs but the second that cord is cut and the baby takes that first screaming breath,

the entire flow of traffic has to reroute.

Instantly.

Instantly.

And if that transition fumbles.

If it fumbles or if the construction work back in that third week of gestation didn't follow the blueprints, that's when we end up with congenital heart defects.

Right.

And the text is stark about this.

Congenital heart defects are the principal cause of death during the first year of life.

That is a sobering statistic.

It is.

It really highlights why the nurse is the front line.

I mean, you might be the one noticing that a baby is too tired to eat or that their color looks a little off under the fluorescent lights.

Early detection is everything.

It is absolutely everything.

So let's get into the mechanics of that transition.

Let's do it.

Because you're right, we can't understand the defects if we don't understand what normal looks like or rather how normal shifts.

And the chapter leans heavily on the concept of hemodynamics.

Okay, let's break that down for the listeners.

Hemo implies blood.

Dynamics implies change or motion.

Exactly.

It's the study of blood flow forces.

And if you take nothing else away from this deep dive, remember the golden rule of hemodynamics.

Okay, what is it?

Blood always flows from high pressure to low pressure and it always takes the path of least resistance.

High to low.

Path of least resistance, it sounds like.

Like basic physics.

It is just physics, it's that simple.

Now, apply that to the fetus.

Okay.

In the womb, the lungs are deflated and full of fluid.

Imagine trying to blow up a really stiff balloon.

It takes a lot of pressure.

A ton of pressure.

So the pulmonary vascular resistance is extremely high.

The pressure in the lungs is high.

So blood, following our rule, does not wanna go there.

It wants to avoid it at all costs.

It wants the path of least resistance.

So where does it go?

It uses shortcuts or shunts.

The fetal heart has two main bypass roads.

Two of them.

First, there's the foreman oval.

Think of it like a little trap door between the right and left atria.

The top two chambers?

Yep.

Blood comes into the right side, sees the high pressure of the lungs, and just slips right through that trap door to the left side.

Bypasses the whole thing.

And the second shortcut?

The ductus arteriosus.

This is a vessel that connects the pulmonary artery directly to the aorta.

Oh, okay.

So even if some blood gets into the pulmonary artery, it sees the high resistance of the lungs and takes the off -ramp, you know,

straight into the aorta to go to the rest of the body.

Okay, so that's the prenatal setup.

The shortcuts are open, the lungs are bypassed, then comes birth.

The cord is cut, systemic resistance goes up, the baby takes a breath.

A huge breath.

A huge breath.

The lungs expand and fill with air,

and suddenly the resistance in the lungs, it drops to rock bottom.

So the stiff balloon becomes easy to inflate.

Exactly.

The pressure gradient completely flips.

So now the path of least resistance is the lungs.

Precisely.

Blood rushes there to get oxygen.

And those fetal shortcuts.

The form and ovals slams shut like a one -way valve because of that pressure change.

And the ductus arteriosus.

It detects the new high oxygen levels in the blood and starts to constrict.

It just closes down on its own.

That's the ideal scenario.

But when we talk about patent defects, what does patent mean?

Patent just means open.

Okay.

So if those doors don't close or if there are holes that shouldn't be there in the first place, blood will continue to flow from high pressure to low pressure.

But now that might mean flowing backward.

Or recirculating where it shouldn't.

And that right there is the basis of almost every single defect we're going to discuss.

Before we start categorizing the specific defects, you know, the holes in the kinks, I want to talk about the nurse's eye.

The clinical picture.

Exactly.

If I'm walking into a nursery looking at an infant, I'm not seeing the inside of the heart.

I'm seeing the external signs.

The text provides a general assessment guide.

What are the red flags?

You have to become an investigator.

You really do.

Because an infant cannot tell you, my chest hurts or I feel short of breath.

Right.

You have to observe function.

And the first, and I'd say biggest clue, is often failure to thrive.

We hear that term a lot in pediatrics, but connect it to the heart for me.

Why does a heart problem cause a baby not to gain weight?

Okay.

Think about the energy cost.

If the heart is inefficient, say it has a hole in it and it's leaking,

it has to pump the same blood two or three times just to get enough oxygen out to the tissues.

So it's working overtime.

It is working double time.

The baby is essentially running a marathon while lying in the crib.

Wow.

They are burning through their calories just trying to circulate blood.

So they literally run off their nutrition before they can even use it to grow?

Exactly.

And at the same time, they're too tired to take new nutrition in.

Which brings us to the classic sign.

Fatigue during feeding.

Right.

Feeding is the most strenuous exercise a newborn does.

I mean, it requires sucking, swallowing, and breathing all in perfect coordination.

So if you see a baby who latches on, sucks for just a minute, then stops, looks exhausted,

maybe gets a little glue around the mouth.

That is a massive, massive red flag.

They are what we call air hungry.

Air hungry.

They can't coordinate the breath with the swallow because they are breathless.

You mentioned getting blue around the mouth.

That's circumoral cyanosis.

But there's another sign that often accompanies the feeding fatigue.

Which is?

Sweating.

Specifically on the forehead, right.

The text was very clear on that.

Yes, dipheresis on the scalp or forehead.

Now ask yourself,

do healthy babies sweat?

Not really.

Rarely.

Almost never.

Their systems aren't mature enough for that.

So if a baby is sweating while they're eating or sleeping, that is the sympathetic nervous system, the fight or flight system kicking into overdrive.

So the body is stressed.

The body is stressed.

It's trying to compensate for poor cardiac output.

It's a huge sign.

That's a really specific, tangible detail for the listeners.

Sweaty forehead during feeding equals cardiac stress.

Absolutely.

What about breathing patterns?

What are we looking for?

Well, first you'll see tachypnea, just fast breathing.

And what's normal versus fast?

Normal for an infant is maybe 30 to 60 breaths per minute.

These kids might be running at 80, 90, even over 100.

Wow.

And you might see dyspnea difficulty breathing.

You'll see the chest muscles pulling in what we call retractions.

You can see the ribs.

Now there was a specific safety alert in the text regarding heart rate that I found.

Well, it was counterintuitive.

Let me guess about bradycardia.

Yes, bradycardia.

We usually think of distress as a racing heart,

tachycardia.

In adults, yes.

We worry about tachycardia.

But children are different.

Their heart rate is their main way of increasing cardiac output because they can't really increase the squeeze or the stroke volume very well.

So they just go faster.

They go faster.

Initially, they get tachycardic.

But if a child is hypoxic, starved of oxygen for too long, the heart muscle itself starts to fail, gets tired.

And then it slows down.

It slows down.

And if you have a distressed hypoxic child and you see their heart rate start to drop,

that is not them calming down.

Right, that's a bad sign.

That is a dire warning.

It means the heart is about to stop.

bradycardia in a distressed child is a sign of imminent cardiac arrest.

That is a terrifying but vital distinction.

It sounds like the moment to call the code.

Absolutely.

Do not wait.

Do not hesitate.

Okay, so we have the clinical picture.

The sweaty, tired, breathless baby.

Now we need to look under the hood.

The diagnostics.

The chapter lists the diagnostic toolkit.

We have the non -invasive stuff like the echocardiogram.

Which is the gold standard for initial diagnosis.

It's just ultrasound.

Like the ones used in pregnancy.

Exactly.

It uses sound waves to visualize the structure and the flow.

It's painless.

There's no radiation.

And it tells us if there are holes or bad valves.

It's an amazing tool.

But sometimes we need to get closer.

The text talks about cardiac catheterization.

This sounds much more intense.

It is invasive.

This is serious business.

We're not just looking from the outside anymore.

What actually happens?

We pass a tiny radiopaque catheter through a blood vessel, usually the femoral artery in the leg,

and thread it all the way up into the heart chambers.

Wow.

What does that give us that the ultrasound doesn't?

Direct pressure measurements.

We can measure the exact pressure inside the ventricle or the pulmonary artery.

We can also draw blood samples directly from the chambers to check the oxygen saturation.

It gives us the precise hemodynamics.

And what about angiocardiography?

Is that different?

That's usually part of the same cath procedure.

We inject a contrast dye that shows up on x -ray.

It lights up the bloodstream so we can see the roadmap.

I see.

We can watch the dye flow and see exactly where the traffic jam, where the leak is.

Since this is invasive, there must be significant nursing care post -procedure.

Definitely.

You've just poked a hole in a major artery of a tiny baby.

Yeah.

The biggest risk is hemorrhage.

Right.

The nurse has to monitor that insertion site in the groin like a hawk.

You're looking for a hematoma, a collection of blood under the skin, and you have to keep checking the pulses distal to the site.

Distal meaning further away from the heart.

Right.

So if you went in through the right leg, you check the pulse in the right foot.

And what are you looking for?

You're checking to make sure it's there.

If the foot is cool or pale or you can't find the pulse, you might have a clot that's formed and is now blocking flow to the leg.

It's a medical emergency.

Okay, that makes sense.

Let's move to the defects themselves.

The text categorizes these in a really helpful way based on those hemodynamics we talked about.

It does.

The first group is defects that increase pulmonary blood flow.

Or as nurses often call them, the pink defects.

Pink because the baby generally isn't blue.

Correct.

Let's go back to our pressure rule.

The left side of the heart, which pumps to the body, is high pressure.

Okay.

The right side, which pumps to the lungs, is low pressure.

So if you have a hole connecting them, which way does the blood flow?

High to low, so left to right.

Exactly.

This is a left to right shunt.

You are taking beautiful oxygenated red blood from the left side and pushing it back into the right side.

Where it then goes back to the lungs.

Right.

It just did a trip to the lungs, picked up oxygen, came back, and now you're sending it back to the lungs again.

So the body still gets oxygenated blood, hence the baby stays pink.

Right.

But the lungs, the lungs are getting flooded.

They're overworked.

They're getting the normal blood from the body, plus this extra leak.

It overworks the pulmonary system and can lead to heart failure.

Let's walk through the big three in this category.

First up, atrial septal defect, ASD.

Okay, simple anatomy here.

It's a hole in the septum, the wall between the two atria.

The upper chambers?

The upper chambers.

So oxygenated blood leaks from the left atrium back to the right.

Is this one obvious right away?

Actually, no.

It's often the silent defect.

The pressure difference between the atria isn't huge, so the flow isn't violent.

So the baby might seem fine.

Often these kids are completely asymptomatic.

You might just hear a soft murmur during a preschool checkup years later.

And the treatment for an ASD.

Many of them actually close spontaneously as the child grows.

Oh, that's good news.

It is.

If not, we can patch it surgically or even do it through a cardiac cath.

The text mentions a specific protocol I think is important.

What's that?

They get low dose aspirin for six months after the repair.

And why is that?

We wanna prevent clots from forming on that new synthetic patch while the heart's own tissue grows over it.

Makes sense.

Okay, moving on the heart structure.

Ventricular septal defect, VSD.

The text says this is the most common anomaly.

It is, by far.

Now we are talking about a hole between the ventricles, the powerhouses of the heart.

Or lower chambers.

Right.

And the pressure difference here is massive because the left ventricle is the main pump for the entire body.

So the blood shoots through that hole with a lot of force.

Like a fire hose.

Yeah.

And this creates a very distinct sound.

The classic sign of a VSD is a loud, harsh murmur accompanied by a systolic thrill.

A thrill?

What's a thrill?

It's a vibration.

You can actually feel it with your hand on the child's chest wall.

The turbulence is that intense.

It's like feeling a cat purr, but much stronger.

Interestingly, I've heard that sometimes the smaller holes can make louder noises.

Is that true?

That's absolutely true.

It's the physics of a whistle.

A tiny hole creates a high -velocity jet of blood, a loud scream.

A huge hole is more like an open door.

Lots of blood flows through.

But it's less turbulent, so less noise.

So a loud murmur isn't always worse than a quiet one?

Not at all.

A very quiet murmur could mean the hole is massive and the pressures are equalizing, which is a very bad sign.

That's a great nugget for the listeners.

What's the outlook for a VSD?

Surprisingly good.

Many of the small ones close on their own in the first year of life.

And if they don't?

If not, surgery to ligate, which means tie off or patch the hole, has an excellent prognosis.

The main thing is we want to prevent that high -pressure blood from hammering the lungs year after year.

Because that can cause permanent lung damage.

Exactly, pulmonary hypertension.

Okay, the third pink defect is the patent ductus arteriosus, PDA.

We touched on this in the intro, the fetal shortcut that forgets to close.

Right, the ductus connects the aorta and the pulmonary artery.

Yeah.

And the fetus, it shuns blood away from the lungs.

After birth, if it stays open, the pressure flips.

Now you have high -pressure aortic blood flowing back into the low -pressure pulmonary artery.

Again, flooding the lungs.

The classic signs here are really distinct.

First, the murmur.

It sounds like a machine humming.

A machine.

The continuous machinery -type murmur.

Yeah.

It doesn't stop.

And second, you have to check the pulses.

The text describes the radial pulse as full and bounding.

What does that feel like?

Think about why it happens.

The heart pumps blood into the aorta so you feel a strong pulse.

Right.

But then some of that blood immediately leaks away through the PDA into the pulmonary arteries so the pressure in the aorta drops quickly.

So it hits hard and then disappears.

Exactly.

So you get what's called a wide pulse pressure.

A big gap between the systolic and diastolic numbers.

The pulse hits hard and then it just collapses.

It feels like a water hammer.

How do we fix a PDA?

There is a fascinating pharmacological intervention mentioned for preemies.

This is one of the coolest things in neonatology.

In premature infants, we can sometimes close the PDA using medication.

Endomethacin or ibuprofen.

Wait, like Advil, simple ibuprofen.

Yes, intravenous ibuprofen.

Remember, there are chemicals in the body called prostaglandins that keep the ductus open during fetal life.

Okay.

Well, ibuprofen is a prostaglandin inhibitor.

You block the chemical and the vessel constricts and closes.

It's like a chemical surgery.

That is incredible.

But if the child is older or full term, that doesn't work.

Usually not.

By then the vessel has changed so we have to physically close it, either with surgery or by placing a coil or a plug into it through a cardiac catheter.

Okay, so those are the pink defects.

ASD, VSD, PDA, too much blood to the lungs but the body is getting oxygen.

Right.

Now let's look at the second category.

Defects that restrict blood flow.

These are obstructive.

The big player here is coarctation of the aorta.

Coarctation, what does that mean?

It's a fancy word for tightening or narrowing.

Just imagine a garden hose with a big kink in it.

And the aorta is the main hose feeding the entire body.

Exactly.

And usually this narrowing happens right after the arch of the aorta, just after the vessels that branch off to the arms and head have already left.

So mechanically, what does that do to the blood flow?

Think about the traffic jam before the kink.

You get a huge backup.

So high pressure.

High pressure builds up in the head, the neck and the arms but after the kink, it's just a trickle of flow to the lower body, the kidneys and the legs.

This leads to the major diagnostic clue, doesn't it?

This was a massive safety alert in the text.

This is a classic exam question and a critical clinical finding.

If you measure blood pressure in the arm and then in the leg.

Which you should be doing.

You should.

Normally the leg pressure should be slightly higher, about 10, 15 millimeter HG higher, but in coarctation, it's completely reversed.

So you get to.

You get high blood pressure in the arms and low blood pressure in the legs.

That is such a clear definitive sign.

If a nurse sees a significant difference between upper and lower extremity BP, bells should be going off.

Absolutely.

And look at the patient.

Listen to them.

They might complain of headaches or nosebleeds.

That's from the high pressure in the head.

Right.

But then they'll say their legs hurt after running or playing.

That's from the low flow to the legs.

They get claudication.

There was also a note about rib notching on x -rays.

What's that about?

That's the body being amazing and trying to fix itself.

When the main highway is blocked.

It builds detour roads.

Exactly.

The body grows collateral vessels to get around the blockage.

These vessels get so big and engorged with high pressure blood that they actually rode little grooves into the bottom of the ribs over time.

That's incredible.

So treatment involves opening that kink balloon angioplasty or surgery, but there was a specific post -op nursing priority mentioned, GI bleeding and hypertension.

Why the gut?

Okay, think about the physiology.

For years, maybe, the abdominal organs have been adapting to low pressure, like a slow trickle from a faucet.

Suddenly, you fix the aorta and you blast them with a fire hose of normal pressure.

It can shock the mesenteric arteries, causing abdominal pain, nausea, and even bleeding.

You have to monitor the gut very closely after that surgery.

Okay, moving on.

We've done pink defects.

We've done obstructive defects.

Now we enter what feels like the danger zone.

Defects that decrease pulmonary blood flow.

The blue defects.

Because these are the ones that cause cyanosis.

Right, in these cases, something is blocking blood from getting to the lungs.

So the unoxygenated blue blood gets frustrated.

It finds a hole, like a VSD, and crosses from the right side directly to the left side without picking up any oxygen.

This is a right to left shunt.

Exactly, you have unoxygenated blood getting pumped out to the body.

And the baby looks blue.

The most famous one here is tetralogy of phallate.

Tetralogy, tetra means four.

Right.

So this isn't just one problem.

It's a package deal of four specific defects all working together to create a perfect storm.

Let's list them out clearly for everyone.

Okay, number one, pulmonary artery stenosis.

The exit door to the lungs is narrow and stiff.

Okay, that's the obstruction.

Number two, hypertrophy of the right ventricle.

Because that door is narrow, the right ventricular muscle gets huge and thick trying to force the door open.

It's like a bodybuilder's arm.

Makes sense.

What's number three?

Dextral position of the aorta.

The aorta is shifted out of place.

It's supposed to sit over the left ventricle, but instead it's sitting right over the middle, over the septum.

Ready to catch blood from both sides.

Exactly.

And number four is the VSD, a hole between the ventricles.

That is a lot of mechanics.

So how does it all play out in terms of blood flow?

The blue blood enters the right ventricle.

It tries to go to the lungs, but the door is stuck because of the stenosis.

Path of most resistance.

Right, so it looks around, it sees the VSD.

It sees the aorta sitting right there wide open.

So it takes the path of least resistance through the VSD, into the aorta, and out to the body.

And it just skips the lungs entirely.

It skips the lungs, hence the cyanosis.

And the text mentions a boot -shaped heart on x -ray.

Why a boot shape?

But it's caused by that huge hypertrophied right ventricle.

It's so muscular, it lifts the apex of the heart up, making it look like the toe of a boot.

No, we have to talk about tet spells.

The text calls them paroxysmal hypercyanotic episodes.

Tet spells are terrifying for parents to witness.

They usually happen in the first two years of life.

What triggers them?

Anything that increases the body's demand for oxygen.

Crying, feeding, straining its stool, even just waking up, the heart clamps down, the spasm worsens the pulmonary stenosis.

So even less blood can get to the lungs.

Right, and suddenly the child turns a deep, dark blue, gasps for air, and can go limp.

What is the immediate nursing action?

This is one of those know -it -cold moments, isn't it?

This is it, knee -chest position.

You take the infant, and you push their knees up tight against their chest.

Why does that work?

It seems so mechanical.

It is mechanical, and it's brilliant physics.

By scrunching the legs up like that, you are kinking the femoral arteries in the groin.

This dramatically increases systemic vascular resistance.

You're making it harder for blood to flow down to the legs.

So you're increasing the pressure on the left side of the body.

Exactly, and remember our rule.

High pressure to low.

By raising the pressure on the left, or systemic side, you force the blood to reconsider.

It says, whoa, it's too hard to go to the legs now.

So more blood is forced back through the VSD and into the pulmonary artery, and finally to the lungs.

You are physically reversing the shunt with the baby's legs.

That's exactly what you're doing.

That is amazing.

And the text says older kids figure this out on their own.

They do, it's incredible to see.

You'll have a toddler on the playground running around, they get winded, and they will just stop and squat down.

They look like they're just resting.

But they aren't just resting.

They are instinctively doing a tet squat to oxygenate themselves.

They're doing the same thing as the knee -chest position.

The body is incredibly smart.

There's another side effect of this chronic low oxygen mentioned in the chapter called polycythemia.

Right, the kidneys detect low oxygen levels in the blood.

So they release a hormone called erythropoietin.

And that hormone tells the bone marrow.

Emergency, make more red blood cells.

We need more trucks to carry oxygen.

But more isn't always better here, is it?

No, if you have too many cars on the highway, you get a traffic jam.

Polycythemia makes the blood thick and viscous like sludge.

And that's dangerous.

It's very dangerous.

It increases the risk of clots, specifically cerebral thrombosis strokes, which is why the nurse has to be vigilant about keeping these kids hydrated.

Dehydration makes that sludge even thicker.

Okay, before we leave the defects, we have one mixed pathology to cover.

This one sounds really serious.

Hypoplastic left heart syndrome, HLHS.

This is arguably the most severe congenital heart defect that is compatible with life, even for a short time.

What does hypoplastic mean?

It means underdeveloped.

Essentially, the entire left side of the heart, the left ventricle, the aorta, it's nonfunctional or barely there.

It's a tiny, useless chamber.

The main pump for the body is just missing.

How does a baby survive this, even for a minute?

They survive only because of those fetal shunts we talked about at the very beginning.

The foramen oval and the ductus arteriosus.

Yes,

they allow the right side of the heart to do double duty.

It pumps blood to both the lungs and to the body through those mixed pathways.

So in this specific case, we actually wanna keep those shunts open.

Exactly.

It's the complete opposite of the PDA treatment.

If the ductus arteriosus closes in a baby with HLHS, they lose all blood flow to their body and they die.

So what do we do?

We immediately start a continuous infusion of prostaglandin E1.

It's the very chemical that keeps the ductus open in the womb.

We give it as a medicine to keep that vessel wide open.

That is such a delicate life -sustaining balance and the long -term treatment.

It's a very difficult road.

It requires a series of three major open -heart surgeries, the Norwood, the Glenn, and the Fonten stage over the first few years of life to completely replumb the heart or a heart transplant.

Let's shift gears to the nursing care that applies to all these surgeries.

The text goes into detail about chest tubes.

After open -heart surgery, the chest cavity has air and fluid in it.

We need to drain that.

Right.

We need to reestablish the negative pressure in the pleural space so the lungs can fully expand.

What are the cardinal rules for managing a chest tube system?

The things a nurse can never, ever forget.

Okay, rule number one is gravity.

The drainage unit is a water seal system.

It must always, always, always stay below the level of the chest.

What happens if you lift it up?

If you lift it up to move the patient in bed,

all that drain fluid can flow right back into the chest.

Okay, so keep it low.

What's rule two?

It has to be airtight.

No leaks in the tubing or connections.

And rule number three is emergency prep.

The text says you must have two padded Kelly clamps at the bedside at all times.

What are the clamps for?

If the system breaks, say the tube accidentally disconnects or the collection box smashes on the floor air, will rush into the chest and collapse the lung.

That's a pneumothorax.

A huge emergency.

A huge emergency.

You have to clamp the tube near the chest immediately to seal the patient off on the outside world while you get a new system.

Another general care point was dental health.

This seems disconnected.

Why are we talking about teeth in a cardiac episode?

It's surprisingly and critically connected.

The mouth is full of bacteria.

Right.

If a child with a heart defect, especially one with a patch or an artificial valve, has poor dental hygiene,

that bacteria can enter the bloodstream during chewing or brushing.

And that's called bacteremia.

Right.

And that bacteria loves to set up shop on damaged or artificial heart valves.

It colonizes them, causing bacterial endocarditis.

Which is a life -threatening infection of the heart lining.

Exactly.

So these kids need prophylactic antibiotics before any dental procedure, even a cleaning.

It's a lifelong precaution.

Moving to section seven, acquired heart disease, specifically congestive heart failure, CHF.

This isn't a defect itself, but a result of a defect, right?

Yes.

CHF is the state where the heart just can't pump enough blood to meet the body's metabolic needs.

It can be a result of that VSD, the coarctation, or the tetralogy.

The pump is just failing.

The text differentiates right -sided versus left -sided failure.

Can you explain that?

I can.

In theory, you can separate them.

Okay.

Right -sided failure.

The right ventricle fails to pump blood to the lungs effectively.

So blood backs up into the body.

And you see?

You see systemic edema, a big swollen liver, swollen ankles,

puffiness.

And left -sided?

Left -sided failure.

The left ventricle fails to pump to the body, so blood backs up into the lungs.

And that causes respiratory distress.

Exactly.

Pulmonary edema, you'll hear crackles in the lungs.

The baby will be short of breath.

But the reality in infants, because their hearts are so small and the chambers are so dependent on each other, is that eventually both sides usually fail.

We've discussed the signs, the sweating, the feeding fatigue.

Let's talk about management.

How do we treat CHF in a baby?

We have two main goals.

One, reduce the workload of the heart.

And two, improve the pump's efficiency.

How do you reduce the workload?

We organize care to minimize disturbance.

You cluster your care.

Don't wake them up every 10 minutes for vitals.

Let them sleep, let them conserve energy.

And feeding techniques.

The text mentions something specific about the bottle nipple.

Yes.

Small, frequent feedings so they don't get too tired.

And use a soft nipple with a large hole.

Why a large hole?

So the milk flows easily.

You wanna reduce the suck work.

If the baby has to suck really hard, that's a cardio workout.

We want them to get the calories without the exercise.

Now medication.

The big gun here is degoxin, or Lenoxin.

Degoxin is a serious, serious drug.

It's what we call a cardiac glycoside.

And what do they do?

It have two main effects.

It slows the heart rate down, which is a negative chronotropic effect.

And it strengthens the force of the contraction, a positive inotropic effect.

So it makes each beat slower, but deeper, and more efficient.

More bang for your buck with each beat.

But it has a narrow therapeutic window.

It's easy to overdose.

Very easy.

The difference between a therapeutic dose and a toxic dose is tiny.

That's why the pulse rule is so critical.

Okay, lay it out for us.

Before giving degoxin, the nurse must count the apical pulse listening right at the apex of the heart with a stethoscope for a full 60 seconds.

No shortcuts.

And what are the cutoffs?

When do you hold the dose?

If it's an infant,

you withhold the dose.

If the heart rate is less than 100 beats per minute.

And for an older child.

You withhold it if it's less than 70 beats per minute.

Below 100 for an infant seems high to an adult nurse.

But we have to remember, infant hearts normally run 120, 160.

Exactly.

If an infant's heart rate is already at 90, and you give a drug that slows the heart even further,

you could stop the heart.

What are the signs of degoxin toxicity we should be watching for?

The big one is vomiting.

Just vomiting?

Yes.

If a baby on degoxin vomits, you do not give a second dose, you hold it, assume it might be toxicity, and you call the provider.

Also watch for anorexia, which is refusal to eat, and any irregular heart rhythms.

And because the doses are microscopic, we're talking measured in micrograms, two nurses must check the calculation and the dose every single time.

We also use diuretics like Lasix or furosemide to pull off that extra fluid from the lungs and body.

Right, get rid of the edema.

What's the main thing to watch for with Lasix?

The catch with Lasix is that it's not potassium sparing.

It makes you pee out a lot of potassium.

And low potassium hypokalemia is a problem.

It's a huge problem, because it actually makes the heart more sensitive to degoxin, which makes degoxin toxicity worse.

Wow, they're interconnected.

Very.

So we have to monitor electrolytes and maybe encourage foods high in potassium like bananas or oranges in older kids who can eat them.

Let's transition to a disease that feels like a ghost from the past, but is still a real threat, rheumatic fever.

Yes, this is an autoimmune tragedy.

It's what happens about one to six weeks after a group of beta hemolytic streptococcus infection.

So untreated strep throat.

Untreated or inadequately treated strep throat.

So a simple sore throat can destroy your heart valves.

How does that happen?

That is the chain of events.

The body mounts a defense to fight the strep bacteria, but the antibodies it creates get confused.

It's a process called molecular mimicry.

They can't tell the difference between the bacteria and the body.

Exactly.

The antibodies start attacking the body's own connective tissue, specifically in the joints, the skin, the brain, and most tragically, the heart valves.

Diagnosing this relies on the Jones criteria.

Right.

You need a certain number of major or minor symptoms to make the diagnosis.

The major ones are fascinatingly distinct.

Let's go through them.

First and most serious is carditis.

Inflammation of the heart muscle and the valves, usually the mitral valve.

This is the part that can kill you or cause permanent disability.

Okay.

What else?

Migratory polyarthritis.

Breaking that down?

Yeah.

Multiple joints inflamed and moving around.

Exactly.

The joint pain migrates.

Today, the left knee is swollen, red and hot.

Tomorrow, the knees is fine, but it's the right elbow.

The next day, the wrist.

But notably, it doesn't permanently damage the joints.

It just moves.

Then there's the skin stuff.

Arithema marginatum.

It's a very specific rash with red circles and wavy lines on the trunk and limbs.

Looks like map borders.

You can get subcutaneous nodules, which are these little non -tender lumps under the skin over bony spots like the elbows or spine.

And the most unusual one involving the brain.

Correa, or Sydenham's correa.

Historically, it was called St.

Vitus dance.

What does that look like?

It causes involuntary, purposeless, jerky movements.

The child might grimace, they might drop things, stumble around.

Their handwriting can get really bad.

It can be mistaken for behavioral problems, but it's actually inflammation in the brain.

It does resolve, but it's very distressing for the child and family.

So the treatment has to focus on killing the strep and saving the heart.

That's it.

A long course of penicillin to wipe out any lingering bacteria.

Anti -inflammatories like aspirin for the joint pain and inflammation.

And this is key bed rest.

Why is bed rest so important?

We have to unload the heart.

If the heart muscle is inflamed with carditis, we cannot have that child running around the playground.

Any extra physical activity could cause permanent, irreversible cardiac damage.

Okay, moving to section nine.

Systemic hypertension, high blood pressure in kids.

It's becoming more and more common, unfortunately, divided into primary and secondary.

What's the difference?

In young kids, it's usually secondary.

That means it's caused by another disease, like a kidney problem or that coarctation of the aorta we just discussed.

If you fix the underlying problem,

the BP goes back to normal.

And primary.

In adolescents, we are seeing much more primary or essential hypertension.

This is the kind that's related to heredity, obesity, stress, and poor diet.

The text highlights a really important technical pitfall with measuring BP in kids, cuff size.

This is crucial and it's a common mistake.

If you use a blood pressure cuff that is too small for the child's arm, you will get a falsely high reading.

And if it's too big.

You'll get a falsely low reading.

The bladder of the cuff needs to cover 80, 100 % of the arm circumference.

You literally have to measure the arm and choose the right cuff.

You can't just eyeball it.

Treatment involves lifestyle changes, like the DAH diet.

Yes, the dietary approach is to stop hypertension.

It's high in fruits, veggies, whole grains, low -fat dairy.

An exercise of recommendation is 60 minutes a day for kids and limiting screen time to less than two hours.

Speaking of diet, section 10 touches on hyperlipidemia, high cholesterol in children.

The main takeaway here is about screening.

The guidelines recommend universal screening for all kids at ages 9, 11, and then again at 17, 21.

Right, but there is a hugely important dietary note for the tiny ones in the text.

This is so important.

Which is.

Do not restrict fat in children under two years old.

Even if there is a strong family history of high cholesterol.

Even then, infants and toddlers need fat, especially dietary fats for brain development.

The process of myelination coating the nerves in the brain requires fat.

If you put a one -year -old on skim milk, you are risking their neurological development.

That's a vital piece of information.

Finally, let's talk about a real mystery illness, Kawasaki disease.

Kawasaki is now the leading cause of acquired cardiovascular disease in the United States.

And the scary part is, we still don't know the exact cause.

What do we think it is?

It's likely an immune response to some kind of trigger, maybe a virus.

Well, whatever the trigger, it causes widespread vasculitis, a dangerous inflammation of the blood vessels, particularly the arteries.

It presents very dramatically.

What does the nurse see?

The hallmark sign is a high fever.

We're talking over 104 degrees serif that lasts for more than five days.

And this is key.

It does not respond to antipyretics like Tylenol or ibuprofen.

It's a stubborn, persistent fever.

And then there are other signs.

Yes, you have to look at the mucous membranes.

You get strawberry tongue, a bright red bumpy tongue.

You get conjunctivitis, which is very red eyes, but with no discharge, no pus.

And the skin.

You get a rash.

And then a bit later in the illness, you see peeling skin desquamation of the palms and soles.

The skin on the fingertips and toes literally peels off in sheets.

It's very distinctive.

The danger here isn't the fever itself, it's what that inflammation does to the heart vessels.

Specifically the coronary arteries.

The inflammation weakens the vessel walls.

They can balloon out, forming aneurysms.

And aneurysms are dangerous.

Extremely.

Blood flows poorly and swirls in aneurysms, which leads to clots and potentially the heart attacks.

We're talking about heart attacks in toddlers and young children.

So treatment needs to be aggressive and immediate.

Absolutely.

We use IVG intravenous immune clobulin.

What is that?

It's basically a concentrated soup of donor antibodies that seems to calm the whole immune system down.

If we give it early in the illness, it can prevent that coronary artery damage from happening.

And here is the exception to a major rule in pediatrics.

We give high doses of aspirin.

Yes.

We are always, always told never to give aspirin to kids because of the risk of Ray's syndrome.

Right.

Correct.

Ray's syndrome is a real risk.

But in Kawasaki, the risk of a child having a heart attack from a clot is greater.

We use the aspirin for its anti -inflammatory and its anti -platelet effect to thin the blood and prevent clots from forming in those aneurysms.

One final nursing note on the IVG, it affects vaccinations, right?

Yes.

IVG is an antibody overload.

It interferes with how the body responds to certain vaccines.

So a child who gets IVG cannot receive live vaccines like MMR or varicella for 11 months after the treatment.

Because they won't work.

They won't mount a proper immune response.

You have to wait.

That is a massive amount of information we've just unpacked.

My goodness.

We've gone from the first breath of the newborn to the physics of shunts, the subtle signs of heart failure, and finally, these complex acquired conditions.

It is a lot.

But if you step back from it all, the theme is clear.

The heart is resilient, but it is also communicative.

It tells us when it's struggling.

Whether it's a baby squatting on a playground or a pulse that feels too bounding or that fever that just won't break.

Exactly.

The signs are there.

The why is there in the hemodynamics.

For the nurse, knowing these signs isn't just about passing the NCLEX.

It's about being the person who notices the pattern and saves a life.

Here's a provocative thought to leave you with.

We treat these as childhood conditions, but think about the long game.

A child who has a repaired tetralogy of phallate or a child who had rheumatic fever scarring, they don't just get cured, they become adults with cardiac histories.

Pediatric prevention is actually lifelong cardiac care.

The roots of adult hypertension start in childhood.

The cholesterol streaks in the arteries start in childhood.

We are literally building the foundation of adult health in these early years.

A powerful perspective.

Thank you for joining us on this deep dive.

This has been the Last Minute Lecture Team helping you keep the pulse on pediatric nursing.

Stay curious and keep listening to those hearts.

See you next time.