Chapter 26: Cardiovascular Conditions in Children

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Welcome back to the Deep Dive.

Today we are opening up the engine room.

We are looking at the single most dynamic system in the human body and specifically what happens when that system faces challenges right out of the gate.

We are deep diving into chapter 26 of Lifer's introduction to maternity and pediatric nursing in Canada.

And this is a massive topic.

We are talking about the cardiovascular system in children.

It's dense.

It's complex.

And honestly, it's one of the most high stakes areas in pediatric nursing.

It is.

And I want to set the expectation for you, the listener, right now.

If you are a nursing student or you're working in PEDS or you're just fascinated by human physiology, this is your deep dive.

Absolutely.

We aren't just listing diseases today.

We are trying to understand the mechanics, the plumbing, and the pressure dynamics of the pediatric heart.

That's the goal because the textbook, Lifer, makes a really important distinction early on.

It's not just about memorizing a diagnosis like, say, Tetralogy of Fallot.

It's about the lens you use as a nurse.

It's about assessment.

It's about spotting the subtle clues, the safety alerts that tell you your child is in trouble long before the monitors start beeping.

Exactly.

We're going to act as detectives today.

We have a clear mission.

We're going to move chronologically through the chapter.

We'll start with how the heart forms, move into that dramatic transition at birth, break down the defects based on how blood flows, and finish with the acquired conditions like Kawasaki disease.

And because we were using the Canadian text, we're going to be very specific about Canadian screening protocols and the unique context of health care in this country.

Especially regarding indigenous health and rheumatic fever, which is a big topic later on.

A very big topic, yeah.

So let's go back to the very beginning.

Embryology.

When does this engine actually start running?

It is incredibly early.

I mean, it's almost hard to believe.

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

The first one.

Before the brain, before anything.

Before anything else is really organized.

We are talking between the third and eighth weeks of gestation.

That is such a tiny window.

Most people barely know they are pregnant at week three or four.

Exactly.

And that's why it's such a vulnerable period.

The heart starts as a simple tube, and then it has to twist and fold into a four chambered pump while it is already beating.

Wow.

So anything disrupts that process in those few weeks.

A virus, a medication,

a genetic error.

You end up with a congenital defect.

But the real engineering marvel isn't just the formation, it's the whole setup, right?

In the womb, the fetus isn't using its lungs.

The plumbing is completely different.

It is.

It's a parallel system.

The placenta is doing all the work of breathing.

So the fetal heart has these specialized bypass roads, we call them shunts,

that divert blood away from the lungs.

Because the lungs are just filled with fluid at that point, they're not doing anything.

They're not doing anything.

So you have the foreman oval, which is a hole between the two atria, and the ductus arteriosus, which is a vessel connecting pulmonary artery to the aorta.

Little highway bypasses.

Perfect analogy.

They just let the blood skip the lung exit entirely.

And then birth happens.

And it is, without a doubt, the most dangerous few minutes of life.

Really?

Think about it.

The cord is cut, the placenta is gone, the baby takes that first breath, the lungs expand with air for the first time, and the pressure in the chest just changes instantly.

It's a total reversal.

Total.

And those bypass roads, the foreman oval and the ductus arteriosus, they have to slam shut.

The blood has to stop bypassing the lungs and start flowing through them.

It's a complete reversal of flow dynamics in a matter of seconds.

And the text points out that for about 90 % of newborns, this miracle happened seamlessly.

It's perfect.

But we, as nurses, are there for the 10%.

The ones where the shunts don't close or the plumbing is hooked up wrong from the start and the whole transition just fails.

That's our focus.

And this leads us to a core concept in all of pediatrics.

Figure 26 .1 in the text puts it bluntly.

Children are not just small adults.

They absolutely are not.

And treating them like they are is a recipe for disaster.

Their heart muscle fibers are less developed, they're less organized.

So they can't pump his heart.

Not as efficiently, no.

And their heart is less compliant, which is a key term.

It means it can't stretch as well to handle extra fluid volume.

Okay, that's a big deal.

It's huge.

And there was a safety alert in the text regarding vital signs that really jumped out at me.

Oh yeah, this is non -negotiable for nurses, right?

Non -negotiable.

The definition of normal changes by the month, sometimes by the week.

A heart rate of 140 beats per minute.

If I had that right now, you should call an ambulance.

I would be very concerned.

For a newborn.

That is perfectly normal.

It's their baseline.

Yeah.

If you apply adult parameters to a neonate, you will either panic unnecessarily or, much worse, miss a sign of shock.

So you have to know your normals for every single age group.

You have to have those charts memorized or in your pocket.

Okay, so if the baseline is so different, what does trouble look like?

If I'm looking at, say, a six -month -old, what are the red flags that the heart is struggling?

You have to look for the signs of the heart working over time.

And the first one, the one that often brings them in,

is failure to thrive.

Which is essentially just poor weight gain.

They're not growing.

Right.

And you have to think about the calorie math.

If a baby's heart is working three times as hard as it should just to circulate blood,

they are burning a massive amount of energy just staring alive.

They can't eat enough to keep up with that demand.

They can't.

They're in a constant state of metabolic overdrive.

What about physical appearance?

What do you see?

You look for cyanosis, that blue or purplish tint to the skin or the mucous membranes.

You look for power, just being really pale.

And what about in the neck?

Yeah, you might see visually observed pulsations in the neck veins.

That means blood is backing up.

The pressure is high.

You'll see tachypnea fast breathing and dyspnea, which is difficulty breathing.

And there's a very specific symptom regarding feeding, right?

This one felt very clinical detective to me.

It is.

Fatigue

For an infant, nursing or taking a bottle is the most strenuous exercise they do all day.

It's their version of a sprint.

I never thought of it that way.

It's a huge workout.

And if a baby starts sweating specifically on the forehead or scalp while they are trying to eat, that is a classic classic sign of cardiac compromise.

Sweating on the forehead while eating.

That is such a vivid image.

Why there?

It's the sympathetic nervous system kicking into overdrive.

The body is in stress.

So they sweat, they get tired, they pull off the nipple, they can't finish the feed.

And that leads right back to the failure to thrive.

It's a vicious cycle.

And there are other signs too, like clubbing of the fingers in older kids, which is a sign of chronic low oxygen.

Right.

And there is a nursing tip in the text about heart rate that seemed almost counterintuitive.

In adults, we worry about tachycardia, the heart racing, but in kids with hypoxia.

It's the opposite.

It's a really important distinction.

A child's initial response to low oxygen is to speed up the heart, to compensate, but eventually the heart muscle just tires out.

It can't keep up and it slows down.

It slows down.

Bradycardia, a slow heart rate in a child who is hypoxic is an ominous dire warning sign.

It means cardiac arrest is imminent.

So you don't have time to think.

You don't have time to think.

You have to resuscitate.

You call a code.

It's that serious.

Okay.

That really puts the perspective.

So let's talk about congenital heart disease itself, CHD.

We know what happens early in pregnancy, but why is it just bad luck?

It's usually a mix.

We call it multifactorial, which accounts for about 85 % cases.

It's a combination of a genetic predisposition and some kind of environmental trigger.

What kind of triggers are we talking about?

It could be a number of things.

Maternal issues like alcohol use.

That's a big one.

Certain viral infections, like rubella, if the mother gets it during that critical window.

What about medications?

Yes, certain medications are known teratogens, like some anti -epileptics or the anticoagulant warfarin, but there's also a clear genetic slice.

About 8 % of cases are linked to specific chromosomal abnormalities or syndromes.

Like Down syndrome or Marfan syndrome.

Exactly.

Kids with those conditions have a much higher incidence of specific heart defects.

The text highlights a specific subgroup called CCHD critical congenital heart disease.

What makes it critical?

These are the babies who are in immediate danger of death or severe morbidity.

CCHD makes up about 25 % of all heart defects in Canada.

So one in four.

One in four.

And these are often what we call duct dependent.

Remember those fetal shunts?

Ductus arteriosus.

Right.

These babies have a defect where they literally rely on that fetal shunt staying open to get blood either to their body or to their lungs.

When that duct naturally starts to close in the timing is everything.

We absolutely have to catch these kids before they go home from the hospital.

Precisely.

And that is why Canada along with many other places has adopted routine pulse oximetry screening or POS.

This is figure 26 .2 in the book.

It's an algorithm.

Can you walk us through this?

Because this is a standard of care now in Canada.

It is.

The Canadian Pediatric Society recommends this for all term and late preterm newborns.

So anyone born at 34 weeks gestation or later.

And when do you do it?

You do it between 24 and 36 hours of life.

Why wait a full day?

Because in those first few hours the pressures in the heart and lungs are still shifting and settling from the birth transition.

If you screen too early you get a lot of false positives which causes unnecessary anxiety and testing.

Okay that makes sense.

Let it stabilize.

And how is the test actually done?

It's not just putting a clip on one finger is it?

No it's very specific.

You have to

oxygen saturation in two locations.

The right hand and either foot.

Okay why the right hand specifically?

It all comes down to anatomy.

The arteries that supply the right arm branch off the aorta before the ductus arteriosus.

We call that pre -ductal blood.

So that's the blood that's going to the brain?

Exactly.

It's a good proxy for what the brain is seeing.

The foot on the other hand receives blood after the ductus arteriosus.

That's post -ductal.

By comparing the two you can detect if there's abnormal shunting or mixing happening.

That's brilliant.

Okay so we have two numbers.

One from the hand one from the foot.

What's a passing grade?

A clear pass is when both numbers are 95 % or higher.

Any the difference between the hand and the foot is 3 % or less.

And a fail.

What's an immediate fail?

Anything under 90 % in either the hand or the foot is an immediate fail.

You stop the screen and move to the next step.

But there's a tricky borderline zone right?

This is where it gets complicated.

It is.

If the saturation is between 90 -94 % or if the difference between the hand and foot is greater than 3 % you don't fail them yet.

You wait an hour and you repeat the entire screen.

And if it's still borderline an hour later?

You wait another hour and you do it a third time.

If it is still borderline after two repeats, so a total of three screens, then it's considered a fail.

So it's a really rigorous filter to avoid false alarms but still catch the real problems.

It is.

So if a baby fails the scream, what happens next?

The clock starts.

First they are not discharged home.

They need a full clinical assessment, a four limb blood pressure check, an ECG, a chest x -ray, and almost always an echo cardiogram.

The echo is the ultrasound of the heart that will actually visualize the structure.

That's the one that gives you the definitive diagnosis.

Speaking of visualization, let's get into the defects themselves.

The text organizes these by hemodynamics, which sounds intimidating.

It does.

But I feel like if you can understand the hemodynamics, you don't really need to memorize the long list of defects.

You could just derive the symptoms from the physics.

Okay, so what's the physics?

It's just two simple rules.

One, blood always flows from an area of high pressure to an area of low pressure.

Mark theta low.

Got it.

And two, blood will always take the path of

Okay, high to low least resistance.

So normally the left side of the heart, which pumps blood to the entire body, is a very high pressure system.

The right side of the heart, which only has to pump to the lungs right next door, is a low pressure system.

So if you punch a hole between them, the blood will naturally flow from the high pressure left side to the low pressure right side.

And that brings us to our first major category of defects.

Defects with increased pulmonary blood flow.

This is what we call a left to right shunt.

Exactly.

You have freshly oxygenated blood from the left side that, instead of going to the body, gets pushed back into the right side and sent to the lungs again.

So the lungs get flooded with too much blood.

They get flooded.

It's like turning the faucet on full blast.

The lungs become boggy and wet, and the right side of the heart has to work way, way too hard.

Now here's the key question.

Does the child look blue?

Are they cyanotic?

No.

That is the single most important takeaway for this category.

They are not cyanotic.

They are a cyanotic.

Why not?

Because the blood that is actually making it out to the body is fully oxygenated.

The problem isn't the quality of the oxygen.

It's the quantity of blood flooding the lungs.

Okay.

So let's hit the big three defects in this category.

First up is the atrial septal defect or ASD.

This is simply a hole between the two upper chambers, the left and right atria.

It's often pretty quiet.

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

So a lot of kids are asymptomatic.

Many are.

And it's often found by accident when a doctor hears a faint murmur on a routine exam.

Some small ones even close on their own.

If not, it's a relatively straightforward repair with a patch.

But the next one, the ventricular septal defect or VSD is not quiet at all.

Definitely not.

The ventricles are the powerhouses of the heart.

The pressure difference between the left and right is massive.

So when blood shoots through a VSD, it's like a fire hose.

And that creates a sound.

A very specific sound.

A loud harsh murmur.

And you can often feel it too.

If you put your hand on the chest, you can feel a vibration, which we call a systolic thrill.

Is it dangerous?

It can be if it's large.

But the good news is that VSD is the most common anomaly and many small ones close on their own in the first year of life.

If they need surgery, the prognosis is generally excellent.

Okay.

The third one in this group is the patent ductus arteriosus or PDA.

We mentioned this ductus earlier.

It's one of those fetal bypasses that's supposed to close.

Right.

If it stays open or patent after birth, you have a connection between the high pressure aorta and the low pressure pulmonary artery.

So blood from the aorta shoots back into the lungs.

Exactly.

It creates a very distinctive continuous murmur that sounds like a machine.

We literally call it a machinery type murmur.

You'll also feel a bounding pulse because the pressure in the arteries is fluctuating so widely.

And you see this a lot in premature babies, don't you?

Very common in preemies.

And in them, we can actually use medication to try and close it.

We give IV indomethacin or ibuprofen.

How does that work?

These drugs are prostaglandin inhibitors.

In the fetus, high levels of prostaglandins are what keep the duct open.

So if we block the prostaglandins, the duct often constricts and closes on its own.

It's chemistry solving a plumbing problem.

That's a perfect way to describe it.

Okay.

So now let's flip the physics.

What happens if there's a blockage instead of a hole?

This next category is defects restricting ventricular blood flow.

This is usually a stenosis, which just means a narrowing.

And the classic example of this is coarctation of the aorta.

Coarctation is a great word.

It basically means a cinch, right?

Like someone put a zip tie around the aorta.

That's exactly what it's like.

Think of a garden hose.

If you pinch it in the middle, what happens?

The pressure builds up behind the pinch and the pressure drops off to a trickle after the pinch.

Right.

The same thing happens in the body.

The coarctation is usually on the aortic arch right after the arteries that go to the head and arms branch off.

So the head and arms get really high pressure.

And the legs and lower body get very low pressure.

This leads to a massive safety alert for nurses regarding blood pressure.

This is a classic exam question, isn't it?

It is a classic exam question and a critical clinical skill.

Normally, the systolic blood pressure in your legs should be about 10 to 15 millimeters of mercury higher than in your arms.

Just because of gravity and vessel size?

Right.

But in a child with coarctation, it's the opposite.

The BP in the arms is high and the BP in the legs is significantly lower.

So if you have a child with bounding pulses in their neck and arms, but their feet are cold and you can barely feel a pulse in their groin.

You have to suspect coarctation of the aorta.

You need to do a four limb blood pressure to confirm it.

Older kids might even complain of leg pain after running because their muscles just aren't getting enough blood flow.

And the body tries to fix this on its own, doesn't it?

Something about the ribs.

It does.

It's amazing.

The body senses the blockage and starts to grow these little bypass arteries called collateral vessels to get around the pinch.

Over time, these vessels can get so large and engorged that they actually start to erode the underside of the ribs.

Wow.

And you can see this on a chest x -ray.

It's called rib notching.

And it's a classic sign of long standing coarctation.

Nature finds a way.

How do we actually fix it?

We can go in with a catheter and use a balloon to stretch the narrowed area open, sometimes placing a stent.

Or for more severe cases, surgeons can actually cut out the narrowed section and sew the ends back together.

OK, now we move to the category that everyone visualizes when they think of heart defects, the so -called blue baby.

These are the defects decreasing pulmonary blood flow.

This is a right to left shunt.

And this is dangerous.

This means there is something, a blockage, preventing blood from getting to the lungs to pick up oxygen.

So the unoxygenated blood gets frustrated, basically.

That's a good way to think of it.

It can't go forward to the lungs, so it takes an escape road.

It finds a hole, jumps across from the right side of the heart to the left side, and completely bypasses the lungs.

And since it never picked up any oxygen, it goes out to the body dark and deoxygenated, and the child looks blue.

Exactly.

This is central cyanosis.

And the poster child for this category of defects is the tetralogy of phallate.

The tet means four.

So there are four things going wrong at once.

It's a perfect storm of four anatomical problems.

One,

you have stenosis of the pulmonary artery.

That's the blockage that stops blood from getting to the lungs easily.

Two,

because the right ventricle has to push so hard against that blockage, the muscle gets huge and thick.

That's right ventricular hypertrophy.

Makes sense.

Three, there's a VSD, a hole between the ventricles.

That's the escape road.

And four, the aorta is shifted over to the right, or dextrepost.

So it's sitting right on top of that VSD.

So the path of least resistance for all that deoxygenated blood is to just go right through the hole and out the aorta, skipping the lungs entirely.

Precisely.

These kids are cyanotic.

And they develop these fascinating coping mechanisms over time.

You'll see clubbing of the fingers and toes.

What does that look like?

The tips of the fingers get round and bulbous and the nail bed gets soft.

It's a sign of chronic hypoxia, chronic low oxygen.

But the most distinct behavioral sign is squatting.

This really caught my attention in the reading.

A toddler who is old enough to walk will just suddenly drop into a squat in the middle of playing.

It's purely instinctive.

They don't know why they're doing it, but their body does.

Squatting kinks the big femoral arteries in the legs.

This dramatically increases the resistance in the body's systemic circulation.

By making it harder for blood to go down to the body, it creates back pressure that forces a little bit more blood to push through that narrow pulmonary stenosis and go to the lungs.

The kid is manipulating their own hemodynamics to breathe better.

It is absolutely amazing.

But sometimes, squatting isn't enough.

They can have what we call a tet spell.

Or a paroxysmal hypersynotic episode.

What happens then?

They suddenly become profoundly synotic.

Deep blue.

They start gasping for air.

They might go limp and they can lose consciousness.

It's terrifying.

It's a medical emergency.

What does the nurse do?

What's the immediate action?

You have to do the squatting for them.

Figure 26 .5 in the text shows the knee chest position.

You immediately grab the child, lay them down and jam their knees up to their chest.

So you're creating that same kink in the arteries.

You are.

You're increasing the systemic resistance to force blood to the lungs.

It can be life -saving.

It's the very first thing you do.

Knee chest position is the first line of defense.

Absolutely.

Followed by giving oxygen, maybe some morphine to calm them down and decrease air hunger.

Because crying and agitation make the spell worse.

Okay.

We have one more category of defects.

Mixed pathology.

And the big one here sounds absolutely devastating.

Hypoplastic left heart syndrome or HLHS.

It is one of the most severe and complex defects we see.

Hypoplastic just means underdeveloped.

In HLHS, the entire left side of the heart, the left ventricle, the aorta, is tiny and essentially non -functional.

So the main pump for the body doesn't work.

How does the baby even survive birth?

They only survive because of the ductus arteriosus.

For the first few hours or days of life, as long as that fetal shunt is open, the right side of the heart is doing double duty.

How?

It pumps blood to the lungs like it's supposed to.

Yeah.

And it pushes some of that blood through the open ductus into the aorta to supply the body.

But we know the ductus closes naturally after birth.

And when it does, the baby's circulation to the body is cut off.

They go into shock and they die.

Rapidly.

So this is a case where we desperately want to keep the abnormal fetal plumbing.

Correct.

As soon as this is diagnosed, we put the baby on a continuous 5e infusion of prostaglandin E1.

To do what?

We chemically force that ductus to stay open, to keep them alive until we can get them to surgery.

And the surgery is massive.

It's a series of three highly complex open heart surgeries staged over several years.

Or a heart transplant.

It's an incredibly difficult road for these families.

Let's shift gears a bit to the care.

We've diagnosed the plumbing issue.

We've maybe gone in and fixed it surgically.

Now we are nursing the patient post procedure.

You mentioned cardiac catheterization earlier, threading a tube into the heart.

It's invasive.

They usually go in through the femoral artery in the groin, which is a big artery.

So what is the nurse watching for when that kid comes back to the floor from the cath lab?

Your eyes are glued to that entry site.

You're watching for bleeding.

If it bleeds, it's an arterial bleed.

It will spurt with a heartbeat.

You apply pressure immediately.

But just as important, you have to check the limb distal to the site, the whole leg.

We use the six Ps of neurovascular checks to make sure a clot has informed.

Okay, the six Ps.

Let's go through them.

Pain, pallor, pulselessness.

Parasthesia, which is pins and needles.

Pressure, like a compartment syndrome.

And paralysis, inability to move the toes.

So if that leg is white, cold, and has no pulse.

You have an arterial clot blocking all blood flow.

That is a medical emergency.

You notify the provider immediately, or that child could lose their leg.

And what about after major open heart surgery?

These kids come back with chest tubes sticking out of them.

Yes, and figure 26 .6 details the drainage system.

The physics here is all about gravity.

You must, must, must keep the drainage system below the level of the child's chest.

Why?

If you lift it up higher than the chest, all that fluid that's drained out will just flow right back into the chest cavity, which could collapse the lung.

Okay, that's a critical rule.

And there's an emergency protocol involving clamps.

There is.

If the drainage unit breaks, say it gets knocked over and cracks, or the tubing disconnects, you've broken the airtight seal.

Air will rush into the chest and cause a pneumothorax, a collapsed lung.

So what do you do?

You are supposed to always keep two padded Kelly clamps at the bedside.

In an emergency, you clamp the tube close to the child's chest immediately, seal it off from the outside air.

That's a check your pockets at the start of your shift kind of tip.

Make sure the clamps are there.

Always.

Let's talk about the parents for a minute.

This has to be incredibly traumatic.

The text brings up the concept of overprotection.

It's a completely natural reaction.

Your child just had their chest cracked open.

You're terrified to let them cry, to let them run, to let them be a kid.

But that can be a problem.

It can.

We have to work with the family to encourage normalcy.

If we wrap these kids in bubble wrap, they don't develop socially or physically.

We have to find that balance.

There is also a surprising point about dental care.

Why is that so important?

It is absolutely crucial.

Kids with structural heart defects, especially those with patches or artificial valves, are at a high risk for a serious infection called infective endocarditis.

An infection of the heart lining.

Exactly.

If they have cavities or gum disease, simple bacteria from their mouth can enter the bloodstream during chewing or brushing.

That bacteria loves to stick to any abnormal surfaces inside the heart.

So good teeth literally equals a healthy heart for these kids.

It does.

And they need prophylactic antibiotics before any dental work, even a routine cleaning, to prevent it.

Okay, let's move to the second big bucket in the chapter.

Acquired heart disease.

And the first topic is heart failure.

Right.

And heart failure, or HF, isn't a disease itself.

It's the end result of many of the congenital defects we just talked about.

The heart has been working so hard for so long that it just can't pump enough blood to meet the body's needs anymore.

In adults, we always hear about left -sided versus right -sided failure.

We do.

Left -sided failure backs up into the lungs, causing respiratory distress.

Right -sided failure backs up into the body, causing edema in the legs and abdomen.

Is it the same in kids?

Not really.

The reality check is that in children, because their hearts are smaller and the chambers are so interdependent, it's rare to see pure left or right failure.

Usually both sides fail together.

We talked about the early symptoms, the sweaty forehead, the fatigue with feeding.

So what are the nursing goals when a child is in heart failure?

It's all about conservation of energy.

You want to reduce the work of the heart in every way possible.

How do you do that?

Small, frequent feeds so they don't get so tired.

Using a higher calorie formula so they get more bang for their buck with every milliliter they drink, keeping them calm, preventing infection.

And medications are a huge part of this.

Table 26 .2 lists the big ones.

Let's start with Degoxin.

Degoxin is the gold standard.

It's an amazing drug.

It does two things.

What?

It slows the heart rate down and it makes each beat stronger.

It makes the pump more efficient.

But it's dangerous.

It has a very, very narrow therapeutic window.

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

So there's a major safety alert for giving it.

Absolutely.

Two nurses must independently check the dose before it's given.

Always.

And you must, must check the patient's apical pulse for one full minute before you give the dose.

Not 15 seconds times four.

A full minute.

A full minute listening with a stethoscope.

Because the rhythm can be irregular.

And what's the cutoff?

When do you hold the dose?

The rule is, for an infant, you hold the drug if the pulse is under 100 beats per minute.

For an older child, the cutoff is usually under 70.

And what if they vomit after getting the dose?

Vomiting is the classic sign of Degoxin toxicity.

If a baby on Degoxin vomits, you do not, if it's just spit up, you hold the next dose and you call the provider.

We also use diuretics like Lasix or furosemide.

To get rid of all that extra fluid that's causing the edema and congesting the lungs.

But the problem with Lasix is that it washes out potassium along with the water.

So you have to watch for hypokalemia, low potassium.

Yes.

Signs like muscle weakness, cramping, or arrhythmias.

We might need to give them potassium supplements or encourage foods like bananas and oranges in older kids.

Okay, let's talk about rheumatic fever.

This feels like such an old -fashioned disease, something out of a history book.

It should be.

It absolutely should be.

But in the Canadian context, it is a glaring signal of health inequity.

What is it exactly?

Rheumatic fever is a systemic autoimmune reaction that happens after an untreated group A strep infection.

So strep throat.

If you don't treat the strep with antibiotics, the body creates antibodies that a few weeks later get confused and start attacking the heart valves.

And the text makes a powerful point that indigenous communities in Canada are disproportionately affected.

It's staggering.

The rates in some indigenous populations are 50 to 75 times higher than in the general Canadian population.

And this is not biology.

This is a direct result of the social determinants of health.

Things like overcrowded housing, lack of access to clean running water for hygiene, and barriers to accessing primary care to get that strep throat diagnosed and treated.

Exactly.

So as a nurse, prevent rheumatic fever isn't just about handing out pills.

It's about advocacy for better loving conditions and health care access.

How do we diagnose it?

The book mentions the Jones criteria.

Right.

To get a diagnosis, you need evidence of a recent strep infection plus either two major criteria or one major and two minor criteria.

What are the major ones?

The biggest, most dangerous one is carditis inflammation of the heart muscle and valves.

But you also see polyarthritis, which is joint pain that characteristically migrates from one large joint to another, like from the knees to the elbows.

And there's a really strange neurological one, right?

Sydenham Crea.

Yes, but we used to call it St.

Vitus's Dance.

The child develops these involuntary, purposeless, jerky movements.

They seem clumsy.

They might be dropping things, making facial grimaces.

It looks neurological, but it's a manifestation of rheumatic fever.

So treatment is antibiotics.

First, a big 10 -day course of penicillin to kill any lingering strep bacteria.

And then, crucially, long -term chemoprophylaxis.

These kids will often stay on a low dose of antibiotics for years, sometimes until they're 21, to prevent it from ever coming back.

Because every time it comes back, it damages the heart valves more.

Exactly.

And eventually, they need valve replacement surgery.

Finally, let's touch on Kawasaki disease.

This is now the leading cause of acquired heart disease in children in developed countries.

It's a really scary disease because it comes on abruptly in previously healthy kids, usually toddlers.

It's a widespread inflammation of the blood vessels.

A vasculitis.

And the main danger is to the heart.

Yes.

The inflammation can cause aneurysms weak, ballooning spots to form in the coronary arteries.

And those can clot off or rupture later in life, causing a heart attack.

The symptoms are very visual and very distinct.

They are.

You have this abrupt high fever that lasts for more than five days and doesn't respond to Tylenol or Advil.

And then you get the strawberry tongue.

It's bright red, bumpy, and swollen.

You also get peeling skin on the palms of the hands and the soles of the feet.

The treatment is unique because it seems to break a major pediatric rule.

It does.

The standard treatment is a high dose of IV Tintravenous immune globulin to calm down the immune system and aspirin.

We are always, always told never give aspirin to children because of the risk of ray syndrome.

This is the one major exception to that rule.

In Kawasaki disease, the risk of the coronary arteries clotting off is so high that the antiplatelet benefit of aspirin is thought to outweigh the small risk of rays.

And a final nursing note on the IV.

This seems important.

Very important.

IV is a blood product full of antibodies.

It can interfere with the body's ability to respond to live vaccines.

So you have to delay them.

Yes.

If a child gets IV, you have to wait 11 months before giving any live vaccines like the measles, mumps, rubella, MMR, or the varicella vaccine.

If you give them too soon, they won't work and the child won't be protected.

That is a classic board exam question.

It is for sure.

Wow.

We have covered a massive amount of ground today.

From that first breath at birth to the blue spells of tetralogy all the way to the strawberry tongue of Kawasaki.

It is a huge journey.

And for you, the listener, whether you are a student or a seasoned pro, the real takeaway here is vigilance.

The anatomy is complex.

The surgeries are miraculous.

But the day -to -day care is all about noticing the details.

It's noticing that little bit of sweat on the forehead during a feed.

It's insisting on checking the blood pressure in all four limbs.

It's listening to that apical pulse for the full minute.

Exactly.

And it's about empowering the parents so they aren't paralyzed by fear.

A child with a significant heart defect can live a vibrant, amazing life.

But they need a nurse who really knows what to look for.

Here's a final thought to chew on as we close.

We started by saying the heart is the very first system to function.

It beats rhythmically and purposefully before the brain even knows it exists.

There is a deep, fundamental biological resilience built into that muscle.

Our job as nurses is just to clear the obstacles, the plumbing issues, the infections, the inflammation, so that that incredible resilience can take over and do its job.

Beautifully said.

Thank you so much for diving deep with us.

A big thank you from the Last Minute Lecture team.

We will see you on the next one.

Take care.