Chapter 23: Cardiovascular Dysfunction in Children

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Welcome back to The Deep Dive.

Today we are taking a trip into what I think is rightfully considered one of the most intimidating units in all of pediatric nursing.

Oh, definitely.

We are metaphorically scrubbing in and cracking the chest to look at Chapter 23 from Wrong's Essentials of Pediatric Nursing.

The child with cardiovascular dysfunction?

Yeah.

It is, it's the beast of the textbook.

It really is.

I've got the source material here and just glancing at the diagrams, you know, hearts with plumbing that looks like it was installed backwards, lists of defects with acronyms like TGA, HLHS, VSD.

It feels overwhelming.

I think for a lot of nursing students and even experienced nurses who don't work in the PICU, this is the chapter that keeps them up at night.

It is the scary chapter and rightfully so.

We are talking about the engine of the body.

When the engine is broken or, you know, built wrong, the stakes are immediate and they are high.

Right.

But, and this is the big but for our dive today, the heart is also the most logical system in the body.

Logical.

That's a bold claim for a chapter that includes something called Tetralogy of Fallot.

That sounds like a spell from Harry Potter, not a medical condition.

It does, doesn't it?

But hear me out.

It is logical if you stop trying to memorize.

Okay.

If you try to memorize VSD means this and ASD means that in isolation, you will drown.

But if you understand the physics, the hydrodynamics of how liquid moves through pipes,

it all clicks.

Our mission today is to stop looking at these as medicalists and start looking at them as plumbing problems.

We want to decode the mechanics.

I love that approach.

We're going to be mechanics today.

So instead of robotic memorization, we want to get to a place where clinical decisions are intuitive.

You see a blue baby and you know why they are blue.

Exactly.

You see a sweaty baby and you know why they are sweating.

So to set the landscape,

the source material divides this huge topic into two main camps.

You have congenital heart disease or CHD and acquired heart disorders.

And the distinction is in the name.

Congenital means born with.

It's anatomical.

The plumbing was installed incorrectly at the factory and it's actually the most common birth defect occurring in about five to eight per one thousand live

births.

That means if you are working in PEDs, you will see this.

It is critical for safe practice and acquired is what happens to a normal heart later.

Exactly.

The heart was built perfectly fine, but something attacked it.

An infection, an autoimmune reaction, you know, environmental factors.

Before we get into the specific defects, the text makes a really crucial point about the consequences, regardless of which specific valve or vessel is broken.

The result usually lands in one of two buckets, two buckets.

If you take nothing else away from this deep dive, remember this heart failure or hypoxemia.

OK, every defect we discussed today ultimately causes one or both of these things.

Either the pump isn't strong enough to move the blood to meet the body's That's heart failure, right?

The pump fails or the blood isn't picking up enough oxygen to supply the tissues.

That's hypoxemia.

So if we get lost in the weeds of a complex defect, we just need to anchor ourselves and ask, is the pump failing or is the oxygen low?

Precisely.

It anchors you, brings you right back to what matters.

OK, let's put on our detective hats.

Section one of our dive is assessment.

The text emphasizes that the assessment starts way before you even touch the baby.

It starts with the history.

And specifically, the mother's pregnancy.

Why are we digging so far back?

Because the heart is the first major organ to develop.

It's forming between the third and eighth week of gestation.

Wow, that's early.

It is.

That is a window when most moms are just finding out they're pregnant.

So we look for teratogens, things that disrupt that early construction work.

What specifically are we looking for in that maternal history?

Well, chronic conditions are big.

Did mom have diabetes?

Uncontrolled diabetes creates a metabolic environment that can severely affect fetal heart formation.

Lupus is another one.

It's an autoimmune condition that can actually attack the fetal heart's conduction system, leading to congenital heart block.

The text also mentions exposures.

Alcohol or drug use, obviously, but also medications.

Finnytoin, or delantin, which is used for seizures, is a known teratogen.

And infections.

And infections like rubella.

If mom contracts rubella in that first trimester, the risk of cardiac defects is massive.

So you're building a risk profile before the baby is even in front of you.

What about the family tree?

Genetics plays a massive role.

If a parent or a sibling has a heart defect, the risk for the new baby jumps up significantly.

But you're also looking for the ghosts in the family history.

Sudden death in young adults.

A history of Cisides, sudden infant death syndrome, that maybe wasn't actually Cisides, but an undiagnosed arrhythmia.

Oh, interesting.

Or a history of frequent fetal loss.

Those can be the quiet signs of hereditary heart disease that no one diagnosed.

OK, so we've gathered the clues from the chart.

Now we're looking at the infant.

And the source material paints a picture here that is quite specific.

It's not always the dramatic movie scene of a clutching chest.

In an infant, it's much more subtle.

It is so subtle.

In an infant, cardiac dysfunction primarily looks like failure to thrive.

Failure to thrive?

Think about the energy cost.

The heart is a muscle.

If your heart has to beat 180 times a minute just to keep you alive because it's inefficient,

you are running a marathon 247.

Right.

You are burning calories so fast you can't grow.

So these babies are tiny.

They fall off the growth chart.

And the parents might report poor feeding.

But that doesn't just mean the baby isn't hungry.

No, it means the baby is too tired to eat.

Eating is the hardest workout a newborn does.

It requires sucking, swallowing, and breathing simultaneously.

If they have heart failure, they get exhausted.

So they just give up.

They do.

A classic sign is a baby who gets sweaty on the scalp while drinking a bottle.

Sweating on the scalp while eating.

That is such a specific visceral detail.

It is.

It's the equivalent of an adult breaking a sweat walking up a flight of stairs.

It's diaphoresis due to exertion.

Visual inspection also mentions chest deformities.

Yeah.

Baby skeletons are soft.

They're mostly cartilage.

If the heart gets massively enlarged because it's overworked, it doesn't just push against the ribs.

It actually warps the chest wall.

You might see a visible bulge on the left side of the sternum.

You might also see unusual pulsations in the neck veins, which indicates fluid is backing up.

And then we have color.

We all know cyanosis, the blue tint.

But the text warns us about pallor, too.

Yeah, and this is so important.

Cyanosis gets all the attention because it's dramatic.

But pallor is scary.

Pallor, or mottled skin, means poor perfusion.

The pump is so weak it can't push blood to the skin capillaries.

So a pale baby is actually a bigger emergency sometimes.

A pale grayish baby is often in more immediate danger of shock than a penguin.

Let's talk about touching the patient palpation.

The text mentions feeling the liver.

That seemed odd to me initially.

Why are we palpating the belly for a heart problem?

It's all connected plumbing.

If the right side of the heart fails, it can't accept the blood coming back from the body.

That blood has to go somewhere.

It backs up.

It backs up into the venous system.

The first major reservoir it hits is the liver.

So hepatomegaly, an enlarged liver, is essentially a storage tank for blood that the heart can't handle.

OK, that makes sense.

If you feel a liver edge three centimeters below the ribs, that's fluid overload.

That makes perfect sense.

It's a traffic jam backing up.

And what about checking pulses?

You are checking for quality and symmetry.

Are the pulses regular?

Are they strong?

And crucially, are they the same in the arms and the legs?

Oh, symmetry.

A huge diagnostic clue for coarctation of the aorta, which we'll get to, is booming pulses in the arms, but weak, thready pulses in the feet.

And for listening auscultation, we're hunting for murmurs.

But the text also mentions the heart rate itself.

Tachycardia is the body's first compensation mechanism.

If the heart isn't pumping enough volume per beat stroke volume, it tries to make up for it by beating faster.

Just to keep up.

Right.

If you have a sleeping infant who should be calm with a pulse over 160, that is a warning siren.

Moving into the diagnostics.

We have the standard ECG and chest X -ray.

Those give us electrical data and heart size.

But the text calls echocardiography the gold standard.

The echo is the game changer.

It uses ultra -high frequency sound waves.

It's non -invasive, no radiation.

And it lets us see the movie, not just the photo.

The movie.

I like that.

We can see the valves opening and closing.

We can see the blood flowing.

We can measure the pressure gradients.

It's incredible.

The challenge though, according to the nursing notes, is the patient cooperation.

Have you ever tried to tell a two -year -old to hold their breath and not move for 45 minutes?

No, sounds impossible.

It is.

And if they are crying, the image is garbage.

So the nursing intervention here is sedation or distraction.

This is where you pull out the iPad, the videos, the toys.

You have to keep them calm.

Let's spend a moment on cardiac catheterization.

This feels like the bridge between diagnosis and surgery.

It is.

This is invasive.

We are threading a catheter, usually through the femoral vein or artery in the groin, all the way up into the heart.

We can use it to measure pressures, which is diagnostic.

Or we can actually fix things, like popping open a stiff valve with a balloon or plugging a hole with a device.

The outline highlights some very specific nursing priorities here that I wanna drill down on.

Pre -procedure.

Marking the pulses.

Seems like such a small detail, but the text bolds it.

It's critical, absolutely critical.

You need to find the pedal pulses on top of the feet and draw an X over them with a marker before the child goes to the lab.

Why is that so important?

Because after the procedure,

that leg is going to be the site of trauma.

The artery might spasm, there might be a clot.

If you can't find the pulse post -op, you need to know, was it weak before or did I just lose it?

Right, you need a baseline.

If you marked it and now it's gone and the foot is cold and pale, you have an emergency.

You've lost blood flow to the limb.

That is a great practical tip.

Don't guess mark it.

Also the text mentions checking the diaper area pre -procedure.

Yes, if the baby has a severe diaper rash, you might have to cancel the procedure.

Remember, you're sticking a catheter through the groin area into the central circulation.

So infection risk.

Massive infection risk.

If there is a rash with yeast or bacteria right there, you're risking introducing that infection directly into the heart that could cause endocarditis.

And post procedure, the big scary risk is hemorrhage.

It's a high pressure artery.

If that plug comes loose, an infant can bleed out in minutes.

If you see bleeding at the dressing site, this is not the time to run to the nursing station to page the doctor.

You act immediately.

And the text specifies you push above the skin puncture.

Right, think about the anatomy.

The catheter enters the skin at one spot, but it threads up and enters the vessel about an inch higher.

You need to compress the vessel puncture, not just the skin hole.

Oh, that makes sense.

So you apply direct continuous pressure about an inch above the skin site and you keep the patient flat.

And that leg needs to stay straight.

For four to six hours.

That is the nursing challenge.

Keeping a toddler's leg straight for six hours.

It requires creativity, parents holding them, cartoons,

whatever works to prevent that hip from flexing and popping the clot.

Okay, let's get into the mechanics.

Section two, the logic of hemodynamics.

You promised that physics could replace memorization.

I stand by that.

To understand every defect we're about to discuss, you only need two rules.

Rule one, blood flows from high pressure to low pressure, always.

High to low, got it.

Rule two,

blood follows the path of least resistance.

Okay, high to low, path of least resistance.

Now picture the normal heart.

The left side is the body pump.

It has to push blood to your toes and your brain against gravity and systemic resistance.

It is high pressure.

The right side just has to push blood next door to the lungs.

Pulmonary resistance is low.

So the right side is low pressure.

Left is high, right is low.

Correct.

So imagine I punch a hole in the wall between the left and right side.

Following rule one, which way does the blood go?

It goes from the high left to the low right.

Bingo.

That is a left to right shunt.

Oxygenated blood that should have gone to the body decides to take the easy path back to the right side and go to the lungs again.

So the body loses that blood and the lungs get double the volume.

Exactly.

The lungs get flooded.

We call this wet lungs.

This leads to heart failure because the heart is pumping the same blood over and over again uselessly and the lungs are congested.

Okay, now flip the script.

What if there is a blockage on the right side, like a kink in the pulmonary artery that makes the pressure there skyrocket?

Now the right side is high pressure.

If there's a hole, the blood goes from high right to low left.

Right to left shunt.

And what kind of blood is on the right side?

Blue, deoxygenated blood.

So now blue blood skips the lungs and goes straight to the body.

And the baby looks blue.

Cyanosis, hypoxemia.

So that's your cheat code.

Left to right shunt equals wet lungs and heart failure.

Right to left shunt equals blue body and cyanosis.

That is brilliantly simple.

Let's apply it to the actual defects.

Section three covers defects with increased pulmonary blood flow.

Based on our logic, these are the left to right shunts.

Correct, the wet defects.

We have ASD, VSE and PDA.

Let's start with the ASD atrial septal defect.

This is a hole between the atria.

The pressure difference between the left and right atria is small, so the flow is gentle.

Patients are often asymptomatic.

So you might not even know.

You might not know they have it until they're older and they start getting dysrhythmias because the right atrium is stretched out from the extra volume.

Now, contrast that with the VSD ventricular septal defect.

The text says this is the most common defect.

It is.

It's a hole between the ventricles.

Remember, ventricles are the powerhouses.

The pressure difference between the left ventricle and right ventricle is huge.

Oh, right.

So when you have a hole there, the blood blasts through from left to right.

So you get a loud murmur.

Very loud.

A harsh systolic murmur.

And because so much blood is being dumped back into the lungs, these babies often show signs of heart failure early.

The silver lining is that many small VSDs close on their own in the first year of life as the heart muscle grows and covers the hole.

And the third one, the PDA, patent ductus arteriosus.

This involves fetal circulation, right?

Yes.

This is a fascinating evolutionary workaround.

In the womb, a fetus doesn't breathe air.

The lungs are filled with fluid.

They're a high resistance zone.

So the fetus has a special pipe the ductus arteriosus, that connects the pulmonary artery directly to the aorta.

It lets blood bypass the lungs completely.

It's a detour.

A necessary detour.

But within hours of birth, that ductus is supposed to close.

If it stays open, if it remains patent, now you have a problem.

The pressure in the aorta is high.

The pressure in the pulmonary artery is low.

Blood flows backwards from the aorta into the lungs.

Machinery murmur is the keyword the text uses here.

Yeah, it sounds like a washing machine.

A continuous murmur.

And again, you're flooding the lungs.

But here's the cool part.

We can treat this with chemistry.

We give endomethacin.

Endomethacin.

The prostaglandin inhibitor.

Prostaglandins keep the duct open.

Endomethacin blocks them and signals the duct to zip shut.

Just with medication, that's incredible.

It works in premature infants especially well.

In older kids, we might need surgery or a catheter plug.

There's one more in this wet group, the AV canal defect.

The source material links this strongly to a specific genetic syndrome.

Gound syndrome.

If you have a patient with trisomy 21, you are actively looking for this.

It's a severe defect.

So what is it exactly?

Instead of separate mitral and tricuspid valves, there's just one giant leaking central valve and a big hole in the middle of the heart involving both the atrial and ventricular septums.

So everything mixes.

It's a free -for -all.

Blood flows left to right.

But because of the valve issues, you get massive volume overload.

These babies almost always have moderate to severe heart failure and mild cyanosis.

They need surgery early.

Okay, moving to section four.

Obstructive defects.

You call these the kink in the hose.

That's the physics.

We aren't shunting blood here.

We are blocking it.

We're dealing with stenosis, which means narrowing.

When you kink a garden hose, what happens?

Pressure builds up behind it.

Pressure builds up behind the kink and the water merely trickles out after the kink.

The big example here is coarctation of the aorta.

Coarctation just means narrowing.

The aorta is pinched, usually right near where that ductus arteriosus was.

So walk me through the clinical picture.

The pinch is in the aorta after the heart, but before the lower body.

Think about the anatomy.

The aorta comes out of the heart, gives branches to the head and arms, and then goes down to the legs.

The pinch is usually after the head and arm branches.

Ah, I see where this is going.

So the blood can get to the arms easily, but get stuck trying to go to the legs?

Worse.

It doesn't just get to the arms easily.

It gets forced there under high pressure because it can't go down.

I see.

So you check the baby.

The arms have high blood pressure and bounding pulses.

The legs, low blood pressure, weak or absent pulses, and cool feet.

That disparity is the diagnostic key.

It is.

And it's dangerous.

That high pressure hitting the brain can cause strokes.

High pressure in the aorta can cause it to rupture.

It needs to be fixed.

Then we have the stenosis sisters, aortic stenosis and pulmonic stenosis.

If you have aortic stenosis, the door out of the left centricle, the aortic valve, is tight.

The left vertical has to pump like a bodybuilder to push the door open.

The muscle gets thick hypertrophy.

And the clinical sign here is chest pain with exercise.

Right.

Because when the kid runs, the heart needs to pump more blood.

Ah.

But the valve is stuck.

It can't increase the output.

The heart muscle starts starving for oxygen and the kid gets chest pain and faintness.

And pulmonic stenosis is the same story, but on the right side going to the lungs.

Right, ventricular hypertrophy.

If it's really tight, the right side pressure gets huge.

So huge it might actually pop open the foreman oval, that little flap between atria.

Oh wow.

And force blue blood across to the left side.

So severe pulmonic stenosis is one of the few obstructive defects that can actually make you blue.

Which brings us perfectly to section five, defects with decreased pulmonary blood flow.

The ble babies.

Now we are in the cyanotic territory.

This happens when you have an obstruction to the lungs plus a hole, like a VSD.

The obstruction makes the pressure high on the right.

The hole gives the blood an escape route to the left.

That classic most famous one here, tetralogy of phallate.

The tet.

It's named tetralogy because there are four components.

But you don't need to memorize the list if you understand the story.

Tell the story.

The story starts with pulmonic stenosis.

The way to the lungs is blocked.

Okay.

Because it's blocked, the right ventricle has to push harder and gets huge and muscular.

Right.

That's the ventricular hypertrophy.

That's two.

Right.

Because the pressure is high, blood looks for a way out.

It finds a VSD, the hole.

That's three.

And finally, the aorta is shifted over.

It sits right on top of that hole,

sucking up blood from both the right and left sides.

That's the overriding aorta.

That's four.

The result is purple, unoxygenated blood going to the body.

Right.

But the scariest part of tetralogy is the tat spell, or hypercyanotic spell.

The text describes this as happening when the baby cries, feeds, or strains.

Think about the anatomy again.

The area right below the pulmonary valve is muscle, the infundibium.

When the baby gets upset, releases adrenaline, cries,

that muscle goes into a spasm, it clamps down.

It clamps down.

It completely shuts off blood flow to the lungs.

So suddenly, zero blood is going to the lungs.

Almost zero.

All the blood shunts to the body.

The baby turns profoundly blue, gray, limp.

It is a hypoxic crisis.

Brain damage or death can happen if it lasts.

And the nursing intervention is squatting.

The knee chest position.

It looks primitive, but it is pure physics.

How does folding a baby's legs up help their heart?

When you kink the leg squat, you are compressing the femoral arteries.

You're increasing the resistance in the systemic circulation.

You are making it harder for the heart to pump to the body.

You're raising the pressure on the left side.

Exactly.

By raising the pressure on the left side, the body, you reverse the pressure gradient.

You force the blood to stop shunting out to the body and push it back toward the lungs.

You are mechanically forcing blood into the pulmonary artery.

That is incredible.

A physical maneuver that changes internal hemodynamics.

It works instantly.

You do that, give 100 % oxygen, which dilates the lung vessels, and give morphine to relax that spasming muscle.

But knee chest is the first move.

The other defect in this group is tricuspid atresia.

Atresia means missing.

The tricuspid valve, the door from right atrium to right ventricle, is just a wall of tissue.

So the blood hits a dead end.

Complete dead end.

No flow to the RV.

The only way this baby survives is if there are holes, an ASD and a VSD, to let the blood mix and eventually find its way to the lungs.

It's a plumbing nightmare requiring complex stage surgeries.

That leads us to the most complex plumbing of all.

Section six, mixed defects.

Mixed means survival depends entirely on mixing the red and blue blood because the circuits are just messed up.

Transposition of the great arteries, PGA.

The text calls this incompatible with life initially.

It's a wiring error.

Pulmonary artery is attached to the left ventricle.

The aorta is attached to the right ventricle.

They are swapped.

So the left side gets red blood from the lungs and pumps it back to the lungs.

Yes.

Red blood loops,

lungs, left heart, lungs and blue blood loops.

Body, right heart, body, two parallel circles that never touch.

The brain gets zero oxygen.

Right.

That sounds fatal immediately upon birth.

It is, unless there is a connection.

We need the PDA, that fetal ductus or a hole in the septum, to stay open so some blood can swap circles.

So for these babies, we actually intervene to stop the body's natural healing.

We want to keep that ductus open.

Yes.

We start a continuous IV infusion of prostaglandin E1.

It keeps the ductus arteriosus wide open.

It buys us time.

Then the surgeons go in and do the arterial switch.

They literally unplug the vessels and plug them into the correct ventricles.

Just incredible.

It's a miracle of modern surgery.

And finally, hypoplastic left heart syndrome,

HLHS.

This is the most heartbreaking one.

The left side of the heart, the main pump never developed.

The left ventricle is a tiny useless sac.

The aortic valve is atretic.

So the body has no pump.

The right ventricle has to do double duty.

It pumps to the lungs and to the body through the PDA, but it can't sustain that.

Without intervention, these babies pass away within days.

The text mentions a staged repair.

It's not a cure.

We can't grow a new ventricle.

We essentially replumb the circulation over three surgeries.

The Norwood, the Glenn, the Fonten, spanning the first few years of life.

And the goal.

The goal is to make the right ventricle pump to the body and let blood flow passively to the lungs.

It's palliative.

It allows survival, but it's a long hard road for these families.

It's heavy stuff, but understanding the mechanism helps us know what to watch for.

Now let's talk about managing the fallout.

Section seven covers heart failure management.

HF in kids looks different.

Tachycardia, sweating, fatigue, sudden weight gain from fluid.

We mentioned digoxin earlier.

It's the old school drug that's still the MVP.

Digoxin makes the heart squeeze harder, so better contractility, and it slows the heart rate down.

It makes the pump more efficient.

But the nursing responsibility here is huge because the therapeutic window is tiny.

The difference between a helpful dose and a toxic dose is microscopic.

The text has a safety alert.

Check apical pulse for one minute.

Not 15 seconds times four.

A full minute, you need to be sure.

And you have strict hold parameters.

If an infant's heart rate is below 90 or 110, depending on hospital policy, you do not give that drug.

You hold it and call the provider.

And toxicity signs.

It's vomiting.

If a baby on digoxin vomits, don't assume it's just spit up.

Assume the toxicity until proven otherwise.

Also bradycardia, a slow heart rate.

We also use diuretics like Lasix to pull fluid off the wet lungs.

Right, but Lasix is a potassium -wasting diuretic.

You pee out potassium.

Here's the dangerous interaction.

Low in potassium, hypokalemia makes digoxin toxicity more likely.

It's a vicious cycle.

So you have to monitor those potassium levels religiously.

Let's talk about decreasing demand.

We talked about feeding being a workout.

How do we help?

We cluster care.

Don't go in at 8 .0 to check vitals, 8 .15 to change a diaper, 8 .30 to give meds.

Do it all at once.

Let the baby sleep.

Let them rest.

And keep them warm.

Cold stress makes the body burn oxygen to stay warm.

We can't afford that spend.

And the text has a specific rule about feeding duration.

The 30 -minute rule.

If a baby hasn't finished their bottle in 30 minutes, stop.

Beyond 30 minutes, they're burning more calories sucking than they are getting from the milk.

It's a net loss.

So what do we do?

Stir them.

No, no.

We gavage feed.

We drop an NG tube and pour the rest in.

We want them to get the calories without the cardio workout.

That makes sense.

We also fortify the formula.

Add MCT oil or extra powder to make it

27 calories per ounce instead of the standard 20.

Make every drop count.

Moving briefly to the long -term effects of hypoxemia.

If a child is chronically blue, the body tries to adapt.

The body says, I'm not getting enough oxygen, so I need more trucks to carry it.

It produces way too many red blood cells.

This is polysaphing.

Not bad.

It makes the blood thick, like sludge or milkshake.

Thick blood clots easily.

So these kids are at high risk for strokes.

Hydration is key to keeping that blood flowing.

You also see clubbing the thickening of the fingertips.

That's a sign of long -term oxygen deprivation.

We're in the homestretch.

Section 8.

Acquired cardiovascular disorders.

Things that attack the heart.

Infective endocarditis.

Bacterial infection of the valves.

Often happens in kids who already have heart defects or artificial valves.

The bacteria usually enter the bloodstream from the mouth.

The dentist.

Dental procedures or just bad oral hygiene.

Bleeding gums allow strep viridans to enter the blood and colonize the heart valves.

So the prevention is?

Prophylactic antibiotics one hour before dental work for high -risk kids until the parents brush their teeth.

Good oral hygiene is actually a cardiac intervention.

Then there's rheumatic fever.

This feels like something from a Charles Dickens novel, but it's still around.

It is.

It's an autoimmune reaction to group A strep throat.

If you don't treat strep throat completely two to six weeks later, the antibodies attack the heart valves.

Usually the mitral valve.

We'll use the Jones criteria to diagnose it.

Yeah.

It affects the joints, polyarthritis, which is this migrating pain, the skin, a specific rash called erythema marginatum, and the brain.

The brain.

Correa, which is this jerky, involuntary, dance -like movement, and of course, carditis inflammation of the heart muscle and valves.

And the treatment involves aspirin?

High -dose aspirin for the inflammation and penicillin to kill the remaining strep.

And then these kids often need monthly penicillin shots for years, sometimes until adulthood, to prevent it from coming back.

Speaking of aspirin, that brings us to Kawasaki disease.

This is a mysterious one.

It's scary because it comes out of nowhere.

Acute systemic vasculitis.

Inflammation of the blood vessels.

We don't know the cause.

What does it look like?

It looks like a miserable child.

High fever over 102 for at least five days, and Tylenol or Mutrin doesn't touch it.

Plus the symptoms.

Strawberry tongue, which is bright red and bumpy, cracked lips, red eyes, but with no goop or drainage,

swollen hands and feet that eventually peel, and a rash.

And the risk isn't just that they feel terrible.

The risk is the heart.

The inflammation attacks the coronary arteries.

It can cause aneurysms, like ballooning, of the vessels that feed the heart.

This can lead to clots and heart attacks in a two -year -old.

A heart attack in a toddler.

Yeah.

So we treat it aggressively.

With what?

Yes.

IV intravenous immunoglobulin to reset the immune system.

And high -dose aspirin.

Wait, I thought we never give aspirin to kids because of Ray's syndrome.

That is the golden rule, usually.

Kawasaki is the exception.

The risk of the heart attack outweighs the risk of Ray's.

We give it for the antiplatelet effect to prevent clots and those aneurysms.

Nursing note here.

If we give IV, we have to delay live vaccines, like MMR, right?

Yes, for 11 months, usually.

The antibodies in the IV will just eat up the vaccine before it works.

Finally, let's touch on shock.

In pediatrics, shock is tricky because kids are great compensators.

Kids are deceiving.

They have compensated shock.

Their blood pressure will stay normal for a long time because they clamp down their vessels so hard, they sacrifice their toes to save their brain.

So the BP is alive.

It is.

So you see cool, pale hands and feet, and a racing heart,

but a normal BP.

If you wait for the BP to drop.

It's too late.

Hypotension in a child is a pre -terminal sign.

It means they have fallen off the cliff.

You have seconds to act before cardiac arrest.

So treat the tachycardia and perfusion.

Don't trust the BP cuff.

Exactly.

Give oxygen, give fluids, isoconic crystalloids, like normal saline rapidly, a 20 milliliter per kilo green bolus.

Don't be afraid to give fluid to a shocky kid.

Wow.

We have covered a massive amount of ground.

From the plumbing logic of shunts to the strawberry tongue of Kawasaki.

It is a dense chapter.

But if listeners take one thing away, I hope it's the hemodynamics model.

Don't memorize the DSEC name.

Look at the plumbing.

Ask yourself, is blood going left to right?

That's wet lungs.

Is going right to left?

That's a blue body.

Is there an obstruction?

That's a pressure load.

And remember, the nursing role isn't just watching monitors.

It's feeding strategies.

It's checking pulses before the cath.

It's knowing when to fold a crying baby into a knee chest position.

Pediatric cardiac nursing is about seeing the whole child growth development family anxiety, not just the hole in the heart.

Thank you for guiding us through the plumbing maze.

To our listeners, seriously, open chapter 23.

Put your finger on the diagram and trace the blood flow.

Use the logic we talked about.

It will stick.

It really will.

That's it for this deep dive.

Thanks for listening and go save some tiny hearts.

Take care.