Chapter 18: Endocrine Disorders in Children

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Okay, let us unpack this.

Today is not just another deep dive.

Strictly speaking, we are on a mission here.

We really are.

We are looking at a stack of pages that I know terrifies a lot of nursing students.

We are talking about the body's control center.

Right, the chemical wi -fi.

Exactly, the chemical wi -fi that runs everything from your height to your heartbeat.

It is a beast of a topic.

It really is a beast.

We are tackling chapter 18 endocrine disorders from the Davis Advantage for pediatric nursing third edition.

And our mission today is simple.

This is the last minute lecture.

I love that.

Imagine you have the big pediatric exam tomorrow morning.

You are completely drowning in hormones and feedback loops and lists of symptoms, and you need a high level summary that actually makes sense.

Right, because we are going to strip away that robotic textbook tone.

We are not just going to read a list of symptoms to you.

No, no, that does not help anyone.

We need to get down to the mechanism, the actual why.

So you actually understand what is happening in the body, because that is the only way to keep these kids safe.

And frankly, it is the only way you are going to pass the test.

Exactly.

So who is this for?

It is for the learner who needs to connect the dots.

We are not just listing tachycardia as a symptom.

We want you to know why the heart is racing.

Yes.

And the scope here is specifically the pediatric endocrine system.

Like I said, I like to think of it as that chemical wi -fi.

It is the silent messenger service.

And it controls so much growth, energy, fluid, balance, sexual development.

Everything.

And when the wi -fi goes down or the signal gets jammed and becomes too strong, things just get chaotic so fast.

Chaos is the right word.

Because unlike the nervous system, which is like a lightning fast electrical wire, you touch a hot stove, you pull your hand back instantly.

That is immediate.

But the endocrine system uses chemicals, hormones.

They have to travel through the bloodstream.

So it takes a little longer to deliver the message.

But the effects are profound and they are long lasting.

Definitely.

So here is our roadmap for this deep dive.

We are going to follow chapter 18 exactly section by section.

Keeping it organized.

We will start with an anatomy and physiology refresh, specifically focusing on the feedback loops because you have to know those.

You really do.

Then we move to assessment because in pediatrics growth is everything.

Then we're going to go gland by gland,

pituitary thyroid, parathyroid, adrenal, and finally the absolute giant of this chapter, which is the pancreas and diabetes.

Diabetes is massive.

We are going to spend a significant amount of time there because the safety alerts for insulin and DKA are critical components of nursing care.

Absolutely critical.

Let us jump right into section one, the A and P refresh, because you cannot fix it if you do not know how it works in the first place.

That is the truth.

The text uses a very specific analogy for how these hormones regulate themselves, the thermostat.

Right.

The feedback loop.

This is the foundational concept for the entire chapter.

I mean, if you do not get this, the rest is just rote memorization, which you will forget by tomorrow.

Yeah.

Memorization fails you under pressure.

Exactly.

Most of the endocrine system operates on a negative feedback loop.

So think of your heater at home.

Okay.

I am picturing it.

It is winter.

Right.

It is cold.

The thermostat is below that.

The thermostat senses the deficit.

It kicks the heater on.

So that is the positive action.

Yes.

The system activates to produce more heat.

Yeah.

But what happens once the temperature hits 70?

The heater shuts off.

Exactly.

The high temperature tells the system we have enough stop working.

That is negative feedback.

Got it.

In the body, let us look at the thyroid, for example.

The hypothalamus is the thermostat.

It sees that thyroid hormone levels are low.

So it sends a signal to the pituitary to basically scream at the thyroid gland to make more hormone.

So the thyroid ramps up its production.

Yes.

And once the hormone levels in the blood rise back to normal, the hypothalamus senses the heat, so to speak.

It stops signaling the pituitary.

Production stops.

Okay.

That makes sense.

And this is why when we look at labs for a hypothyroid patient,

someone whose thyroid factory is broken,

their TSH or thyroid stimulating hormone, is actually high.

Wait, let us pause right there because that always trips people up.

Right.

If the thyroid is low, why is the stimulating hormone high?

Because the thermostat is screaming for heat.

The hypothalamus and the pituitary are shouting, make more hormone.

But the thyroid factory is broken, so it cannot respond.

Oh, I see.

So you have high shouting, which is the TSH, but low product, which are the T3 and T4 hormones.

That makes perfect sense when you put it that way.

It is a supply chain issue.

Precisely a supply chain issue.

Now let us meet the cast of characters briefly before we break them down gland by gland.

Who are the big players here?

Well, it starts at the top of the hypothalamus.

It is the control center sitting right at the base of the brain.

It sends releasing or inhibitory hormones to the boss.

Your boss being the pituitary.

The master gland.

It hangs right beneath the hypothalamus.

And you have to know it has two lobes that do very different things.

Okay.

Let us start with the anterior.

The anterior lobe is the workhorse.

It pumps out growth hormone, or GHTSH, for the thyroid ACTH, for the adrenals prolactin, and the reproductive hormones, FSH and LH.

That is a lot of acronyms.

And the posterior lobe.

It is a little quieter, but it is vital for fluid balance.

It basically stores and secretes ADH, which is antidiuretic hormone and oxytocin.

Okay.

So moving down the body, we have the thyroid and parathyroid in the neck.

Right.

They do metabolism and calcium regulation.

They are neighbors, but they do very completely different jobs.

And the adrenals sitting on top of the kidneys like little hats.

Right.

And they have two distinct parts.

The cortex, which is the outer shell, produces steroids like cortisol.

The medulla, which is the center, produces those fight or flight catecholamines like epinephrine.

And finally, the pancreas.

The sugar regulator.

Insulin and glucagon.

And of course, we cannot forget the gonads for sexual development.

Right.

But really for you as the nurse, knowing where they are is actually less important than knowing how to assess if they're working properly.

Which brings us nicely to section two, nursing assessment.

And the text makes a huge, huge point here.

Growth charts are not just paperwork.

No, they are crucial diagnostic tools.

In pediatrics, growth issues are often the very first sign of an endocrine disorder.

Before any other symptoms show up?

Exactly.

If a child falls off their growth curve or suddenly shoots way above it, that is a red flag waving right in your face.

But the measurement technique matters, right?

You cannot just eyeball it.

The text gets very specific about how to measure these kids.

Accuracy is everything here.

Think about it.

The difference between the 10th percentile and the third percentile might only be a centimeter or two.

If you measure wrong, you might completely miss a diagnosis.

So what are the rules?

The text specifies if the infant is under 24 months, you measure them supine, meaning lying down on a specific measuring board.

And you need two people for that, right?

You cannot do it alone.

Absolutely not.

One person holds the head firmly against the headboard to keep it straight.

The other person, usually the nurse, gently pushes the knees down to fully extend the legs and brings the footboard up to the heels.

Because if they've done their knees?

If you do not straighten the legs, you lose length.

The measurement is completely invalid.

And if they're older than 24 months?

Then they stand.

You use a statiometer.

That is that wall -mounted ruler with the headpiece that slides down.

Right.

We have all seen those.

Heels back against the wall, no shoes, head straight.

And here is a clinical tip.

If you have a kid with a ponytail or a bun, you have to take it down.

Oh yeah.

Because that adds fake height.

Exactly.

You need the true height from the very top of the skull.

Okay.

So we have the number.

Now we have to contextualize it.

The text introduces this calculation called the mid -parental height.

This helps us figure out if a child is short because of a disease or just because their parents are short.

Right.

It determines the child's genetic potential.

Walk us through the math on that.

Let us say we are assessing a boy.

Okay.

Grab a calculator.

You take mom's height in centimeters and dad's height in centimeters.

Add those two together.

Since it is a boy, you add 6 .5 centimeters to that total.

Then you divide that whole thing by two.

That gives you the target height.

And for a girl.

It is the exact same thing.

You add mom and dad, but you subtract 6 .5 centimeters before dividing by two.

Okay.

So if I calculate that a child's genetic potential is say 175 centimeters, but they are tracking on their growth curve to only be 150 centimeters.

Then we have a major problem.

That gap suggests it is not just genetics.

It is pathology.

And that triggers the next diagnostic step.

Which is the bone age X -ray.

This is such a fascinating test.

We take an X -ray of the left hand and wrist.

Always the left hand.

Yes.

It is standardized to the left hand.

And we are not looking for broken bones.

We are looking at the ossification centers.

We want to see how the cartilage is hardening into bone.

So we compare the picture of the child's bones to a standard atlas.

Exactly.

If the child is 10 years old, chronologically, according to their birthday, but their bones look like a seven -year -old's, we say they have a bone age delay.

A gap of more than two standard deviations is clinically significant.

And interestingly, a delay can sometimes actually be good news, right?

In a way, yes.

If the bone age is delayed, it means the epiphyseal plates,

the growth plates are still open.

They still have room to grow if we start treating them.

Okay.

What if it is the other way around?

If the bone age is advanced, say the 10 -year -old has 13 -year -old bones, that is bad.

It means the plates are closing early and they will stop growing way sooner than they should.

That is a crucial distinction to understand.

What else are we looking for in a general exam?

You are really looking for the physical effects of hormone excess or deficiency.

Look at their skin.

Is there strange pigmentation?

In Addison's disease, we look for bronze skin.

Check the neck too.

Yes.

Look at the neck.

Is there a goiter or swelling?

Look at the face.

Is the tongue protruding?

Are the eyes bulging?

And we absolutely have to mention tanner stages here.

Yes.

We will not force you to memorize every single stage right this second, but you need to know that tanner staging is the universal language for pubertal development.

It assesses breasts, genitals, and cubic hair.

Right.

You need to know if a six -year -old is suddenly tanner stage two because that means puberty has started way too early and we need to intervene.

Okay.

Let us get into the specific disorders.

We are following the chapter structure, so we start with the pituitary disorders in section three, the master gland behaving badly.

First up, hypopituitarism, specifically growth hormone deficiency or GHD.

This one is exactly what it sounds like.

The anterior pituitary is simply not making enough growth hormone.

What does that kid look like when they walk into the clinic?

Are they just a short kid?

It is a very specific look.

The textbook describes it as cherubic.

Like a little angel?

Yeah, like a baby face.

They look much younger than their actual chronological age.

They might have a high -pitched voice because their vocal cords have not grown,

delayed dentition so their teeth come in late.

And their weight.

Interestingly, they have increased abdominal fat.

GH actually helps metabolize fat and build muscle so without it they get a little pot belly.

Now in a newborn, this can actually be dangerous, right?

It is not just about height at that age.

Correct.

This is a critical clinical judgment point.

In a newborn GH, deficiency might present as hypoglycemia, low blood sugar.

Why is that?

Because GH is a counter -regulatory hormone.

It helps keep blood sugar up.

Without it, the baby can crash.

You might also see prolonged jaundice and embolism of micro -penis.

That hypoglycemia can be fatal if the nurse misses it.

So we have to treat it.

We replace the missing hormone.

We use somatropin.

Somatropin.

It is a biosynthetic growth hormone.

But here is the kicker for the families.

It is a daily subcutaneous injection.

Daily?

Wow, that is a heavy burden for a family to take on.

It really is every single day.

Usually we teach them to give it at bedtime.

Why bedtime specifically?

Because that mimics the body's natural rhythm.

We release most of our natural growth hormone while we sleep.

We want to match nature as closely as possible.

And as a nurse, what are we teaching the parents about the injection process itself?

You have to teach them to rotate the sights, arms, legs, belly.

If you inject in the exact same spot every night, you get scar tissue and the medication will not absorb properly.

And we also act as advocates here.

Huge advocates.

It is very expensive.

So insurance fights are super common.

Nurses often act as case managers, helping families navigate the approvals.

And when does the treatment stop?

Do they take somatropin forever?

No.

We stop treatment when the growth plates, those epiphyseal plates, close.

We monitor that with the bone age x -ray.

Once those bones fuse, giving more GH will not make you taller.

It will just thicken your bones, which causes a whole host of other problems.

There is a really important psychosocial note in the text here that I want to highlight.

It is huge.

Treat the child according to their age, not their size.

If you have a 12 -year -old who physically looks like an 8 -year -old, you still treat them like a 12 -year -old.

Give them age -appropriate chores.

Dress them in cool clothes for a 12 -year -old.

Do not talk down to them.

Do not baby them.

Or you will stunt their emotional growth just as much as their physical growth is stunted.

Okay, let us flip the coin.

What if we have too much GH, hyperpituitarism?

There are two words you need to clearly distinguish for the exam.

Gigantism and acromegaly.

It all depends on those growth plates we just mentioned.

Okay, break that down for us.

If the excess GH happens before the plates close, so during childhood you get gigantism, the long bones just keep growing and growing.

These kids can be 7 or 8 feet tall.

It is incredibly hard on the heart and the joints.

And if it happens after the plates close?

Then the bones literally cannot get any longer so they get thicker instead.

That is acromegaly.

You see a thickening of the facial features?

The bribe protrudes.

The jaw gets very square and heavy.

The nose widens.

The hands and feet too, right?

Yes, the hands and feet get massive.

It is a slow change over time, but it's very disfiguring.

Got it.

Before plates close equals gigantism.

After plates close equals acromegaly.

Now let us move to the posterior pituitary.

This is the fluid balance center.

We have two conditions here that are total opposites, diabetes insipidus or DI and SIADH.

I love teaching this comparison because it is a perfect seesaw.

It is all about EDH, antidiuretic hormone.

Let us start with the name.

Diabetes insipidus.

This confuses everyone.

Is it sugar diabetes?

No.

The word diabetes just means siphon or passing through.

Mollitus means sweet like sugar.

But insipidus means tasteless like water.

So DI has absolutely nothing to do with insulin or sugar.

It is purely a water problem.

And DI, what is the ADH doing?

It is missing.

You have low ADH.

Think of ADH as the no pee hormone.

It tells your kidneys to hold on to water.

If you do not have the no pee hormone.

You give me pee a lot.

Massive amounts.

Polyuria.

The urine is incredibly dilute.

It is clear like water straight from a tap.

And because you are losing all that water, what happens to the blood?

It gets concentrated.

The sodium level shoots way up.

This gives us our classic nursing demonic high and dry.

High and dry.

Break that down so we can remember it.

The patient is dry dehydrated because they are peeing everything out.

But their serum sodium is high.

Hypernatremia.

And what about their thirst?

Polydipsia.

It is insatiable.

The text mentions even infants will scream for water.

If you give them formula or breast milk, they spit it out.

They are desperate to drink plain water to replace what they are losing.

How do we diagnose it definitively?

The text mentions a water deprivation test.

This is a high risk test.

Basically, we confirm the diagnosis by withholding all fluids.

We want to see if the kidneys can concentrate the urine when the body is dry.

So what happens normally?

In a normal person, if I take away your water, your pee gets very dark and concentrated.

But in DI, it stays completely clear and dilute.

But wait, if they are peeing liters an hour and you take away their water.

Exactly.

They can go into hypovolemic shock very fast.

As a nurse, you cannot leave the bedside during this test.

You are monitoring daily weights and blood pressure constantly.

If the BP drops or the heart rate spikes, you stop the test immediately.

And the treatment for DI?

We replace the missing hormone.

We give Desmopressin or DDAVP.

It is usually administered as a nasal spray.

There is a great clinical tip from the text about that spray.

Clear the nose first.

If the nose is stuffed up with boogers or mucus, the medication will not absorb into the mucosa and the child will go right back into massive polyuria.

Okay, now let us look at the other side of the seesaw.

SIADH, syndrome of inappropriate

antidiuretic hormone.

Inappropriate here means too much.

The body is completely flooded with an OP hormone.

So the kidneys just stop making urine.

Right.

They hold onto every single drop of water.

The child stops peeing.

Fluid retention builds up rapidly.

So the mnemonic for this one is?

Low and wet.

The body is wet, meaning fluid overloaded.

You might hear crackles in the lungs.

You will definitely see weight gain.

But here is the trick.

Usually you do not see massive dependent edema like you would in heart failure because the water is pooled inside the blood vessels.

And the low part?

Low sodium.

Because you are holding onto so much water, you are severely diluting your blood.

The sodium concentration drops.

Hypnotremia.

And this is the danger zone.

Why is low sodium so scary in pediatrics?

Cerebral edema.

When sodium drops, especially when it gets below 125 fluid shifts from the blood right into the brain cells, the brain swells.

Which leads to?

This causes irritability, confusion, and eventually massive seizures.

So safety is the absolute priority.

Seizure precautions are a must.

Pad at the side rails of the bed.

Have suction and oxygen ready at the bedside at all times.

And what is the nursing intervention?

Fluid restriction.

You have to stop the water intake.

It sounds cruel, but you might have to limit a child to very small amounts of fluid per day.

Strict intake and output monitoring is completely non -negotiable.

So to recap that seesaw, DI is high and dry.

High sodium dehydrated.

SIADH is low and wet.

Low sodium overloaded.

Perfect summary.

If you remember that you will get those questions right.

Let us move to section 4, precocious puberty.

Kids growing up too fast.

Specifically, this means sexual development before age 8 in girls and age 9 in boys.

That seems incredibly young.

It is.

We look for tanner stage 2 or greater.

Breast buds in girls, testicular enlargement in boys.

And usually when we do that bone age x -ray it is advanced.

The hormones are maturing the bones way too fast.

Why is that a medical problem though?

Aside from the obvious social awkwardness of being a developed 7 year old.

Short stature.

It sounds contradictory because these kids are actually often the tallest in their class right now.

They shoot up fast.

But because the sex hormones close the growth plates early, they stop growing way too soon.

They end up being very short adults.

So we have to treat it.

We basically hit the pause button.

We do.

With a drug called Luprolide or Lupron.

How does Lupron work?

It is a GnRH agonist.

It basically overstimulates the pituitary gland.

At first it stimulates but then the pituitary gets exhausted and desensitized.

It shuts down the production of LH and FSH entirely.

So it literally pauses puberty in its tracks.

Yes.

It brings the sex hormones back down to pre -puberty levels.

But compliance is key here.

It is usually a monthly injection.

If you miss a dose, the pause button releases and puberty resumes immediately.

And the text gives a really great tip for parents regarding dressing these kids.

Right.

Safety is a huge concern.

If you have a 6 year old girl with breast development,

she does not understand the attention she might get.

You need to teach parents to dress her according to her chronological age.

Do not dress her to look older.

Exactly.

Avoid tight or revealing clothing that might invite unwanted attention from adults who simply do not realize she is a small child.

Section 5.

The thyroid.

The engine of the body.

Let us start with it running too slow.

Hypothyroidism.

In kids, we categorize this as either congenital, meaning they are born with it, or acquired.

Congenital seems really scary because the text says it can cause severe cognitive impairment.

It is the number one cause of preventable intellectual disability.

Thyroid hormone is absolutely essential for brain development in those first few years of life.

If a baby does not have it, the brain does not develop correctly.

That is why we screen every newborn, right?

That is exactly why it is on the mandatory newborn screen in the hospital.

What are the clinical signs if the screening somehow gets missed?

A baby with low thyroid is a quiet baby.

Parents might say, oh, he is such a good baby.

He never cries.

He sleeps all the time.

But clinically, that is a warning sign.

Yes.

Clinically, we see hypotonia.

They are floppy.

They have a horse cry.

They have prolonged jaundice that just does not go away.

They might have a large protruding tongue.

If we catch it, we treat it immediately.

With levothyroxine, thyroid hormone replacement.

And we monitor their labs closely to ensure the dose keeps up with their rapid growth.

And later in life, we have acquired hypothyroidism, often Hashimoto's.

This looks like everything is just slowing down.

The engine is idling.

Fatigue, cold, intolerance.

They were wearing sweaters in the middle of summer.

Weight gain.

Weight gain, despite having a very poor appetite, constipation.

They might develop a goiter, an enlarged thyroid gland, because the gland is trying so incredibly hard to work that it physically gets bigger.

Let us talk about levothyroxine administration.

The text is very specific here, and nurses need to nail this patient education.

It is a Goldilocks drug.

Absorption is very finicky.

You give it in the morning on an empty stomach.

You have to wait 30 minutes before they eat.

And for infants, they cannot swallow pills.

You crush the pill and mix it with a very small amount of water or breast milk.

Just a spoonful.

You have to make sure they get the entire dose.

But there is one thing you never, ever mix it with.

Soy formula.

Soy protein directly interferes with the absorption of the medication.

If the baby is on soy formula,

ideally you switch them.

And if they cannot switch.

If you absolutely cannot switch, you have to separate the medication from the feeding by long time, or the doctor will have to increase the dose significantly to overcome the soy effect.

What if the engine is running too fast?

Hyperthyroidism?

Graves' disease?

Everything speeds up.

The metabolic rate skyrockets.

Tachycardia.

Fast heart rate even when they are resting.

Heat intolerance.

They are sweating profusely when everyone else is cold.

Weight loss despite eating like a horse.

And what happens to the eyes?

Exophelmos.

The bulging eyes.

It is caused by swelling and inflammation in the tissue right behind the eye.

And behaviorally, how do they act?

They are jittery.

Nervous emotional ability is huge.

They literally cannot sit still.

School performance often drops drastically because they cannot focus on anything.

What are our treatment options?

We try to block the hormone synthesis with medications like methamazole or PTU.

If that does not work,

we might have to destroy the gland with radioactive iodine or cut it out entirely with a thyroidectomy.

But there is a life threatening emergency here we need to flag.

Thyroid storm.

This is critical.

If a child with Graves gets an infection or misses their medications or has surgery, they can go into a storm.

The body is suddenly flooded with a massive surge of thyroid hormone.

What does that look like on the floor?

Severe tachycardia heart rate hitting 1 ,8200.

Very high fever.

Agitation confusion.

Even full blown psychosis.

It looks like they are burning up from the inside.

What do we do as nurses?

It is an ICU situation.

Immediate cooling blankets.

Beta blockers like propranolol to slow the heart down and protect it.

Anti -thyroid meds.

If you do not treat it fast, they can die from heart failure.

Section six.

Parathyroid.

These are the four tiny little glands sitting on the back of the thyroid.

Small but mighty.

They have one single job.

Calcium regulation.

So hypoparathyroidism means low calcium.

And low calcium means tetany.

Muscle spasms.

Calcium calms the nerves.

Without enough of it, the nerves fire uncontrollably.

The text mentions a specific assessment sign we check for.

Schwastek sign.

This is a classic nursing exam question.

You tap the facial nerve just in front of the ear, right on the cheek.

If the facial muscles twitch or the lip spasms, that is a positive Schwastek sign.

And that means?

It means their calcium is critically low and they are on the verge of a full body seizure or a laryngeal spasm, which can close off their airway.

And we treat that with calcium and vitamin D.

And we implement seizure precautions again, right?

Yes, absolutely.

Low calcium causes seizures just like low sodium does.

Section seven, adrenal disorders.

These are heavy hitters.

Let us start with Cushing's disease.

Cushing's is excess cortisol.

Think of what happens when a patient is on high -dose steroids for a really long time.

The physical changes are very distinct.

The moon phase.

Very round, full cheeks.

The buffalo hump, which is a fat pad on the back of the neck.

A pendulous heavy abdomen with red or purple striae stretch marks.

And their arms and legs are often surprisingly thin due to muscle wasting.

And they have poor wound healing.

Right.

Cortisol suppresses the immune system.

So they get sick easily and simple cuts just do not heal.

This is usually caused by a tumor or prolonged steroid use?

If it's a from medical steroid use, the key nursing safety point is you must taper the meds, never stop steroids cold turkey.

Why not?

If you do the adrenal glands, which have basically been asleep because the medication was doing their job, will not wake up in time and you will crash into adrenal insufficiency.

Which leads us perfectly into the opposite problem, adrenal insufficiency.

Or the congenital version, CAH congenital adrenal hyperplasia.

We need to spend a solid minute here because CAH is complex and always tested.

CAH is a genetic error.

Think of the adrenal gland as a manufacturing factory.

It's supposed to take raw cholesterol and turn it into cortisol and aldosterone.

But in CAH, one of the specific machines in the factory is broken usually the 21 hydroxylase enzyme.

So the factory cannot make the final product.

Right.

It cannot make cortisol.

But the brain, the hypothalamus, does not know the machine is broken.

It just looks at the blood and sees low cortisol.

So it screams at the factory to work harder, make more, make more.

So the factory gets huge hyperplasia.

Exactly.

But since it cannot make cortisol,

all that raw material gets diverted down a side pathway.

It gets turned into androgens instead, testosterone.

So you have zero cortisol but massive amounts of testosterone.

What does that do to a baby girl?

This is the Hallmark presentation.

Ambiguous genitalia.

The internal organs are fully female ovaries, uterus, but the external genitals look masculinized.

The clitoris is heavily enlarged, maybe looking like a penis.

The labia might be fused.

It can be very distressing and confusing for the parents at birth.

But the bigger medical risk is not the genitalia.

It is the salt -wasting right.

Yes.

Remember, the broken factory also cannot make aldosterone.

Aldosterone's only job is to hold on to salt and water in the kidneys.

Without it, the baby pees out all their sodium.

They dehydrate incredibly fast.

This is the salt -wasting crisis.

What are the signs of that?

Recurrent vomiting,

severe weight loss, profound dehydration metabolic acidosis.

If it is not caught, they go into shock and they die.

So the treatment is lifelong.

We have to replace what is permanently missing.

Glucocorticoids, which is the cortisol, and mineralocorticoids, which is the aldosterone usually given as fluorineph.

And this connects to Addison's disease, which is acquired adrenal insufficiency.

Symptoms are severe weakness,

dizziness, salt cravings, because they're losing salt constantly, and this very specific bronze skin pigmentation.

Like a tan?

Like a deep unnatural tan in weird places, creases of the hands, the gums, the elbows.

Now for both CAH and Addison's, the teaching regarding stress dosing is literally life or death.

This is the most important takeaway for adrenal disorders.

Listen carefully.

Cortisol is our body's primary stress hormone.

In normal person, if you get the flu or you break your leg, your body naturally pumps out huge amounts of extra cortisol to keep your blood pressure up and manage the stress.

But these kids cannot do that.

Right.

Their factory is completely broken.

So if they get sick, even just a fever, they have absolutely no internal defense.

Their blood pressure will bottom out and it will go into fatal shock.

So what do the parents have to do?

They have to act as the adrenal gland.

They must triple the daily steroid dose, triple it usually for 24 to 48 hours while the child is acutely sick.

And what if the kid is vomiting and cannot keep the pills down?

That is a 911 emergency situation.

The parents must have an emergency injection kit at home, solo cortisone, which is hydro cortisone.

They inject it deep into the muscle immediately and then go straight to the ER.

Because if they wait?

If they wait, the child goes into an adisone crisis shock, profound hypoglycemia, and death.

That is intense.

Nurses really need to empower parents with that education.

Absolutely.

Medical alert bracelets are non -negotiable here.

Every teacher, every coach needs to know exactly what to do.

One last adrenal tumor mentioned in the text, pheochromocytoma.

A very rare tumor on the adrenal medulla.

It pumps out catecholamines, adrenaline, and noradrenaline.

So the symptoms are basically high octane fight or flight.

And fitters fate, severe episodic hypertension palpitations, profound sweating, terrible headache.

It comes in these wave -like attacks.

But here's the massive safety alert for the nurse.

Do not palpate the abdomen.

Why?

I mean, nurses are always trained to palpate abdomens during an assessment.

Not here.

If you push on that tumor, you can physically squeeze out a massive bolus of epinephrine into the bloodstream.

You can cause a hypertensive crisis so severe it causes an immediate stroke.

So if you even suspect a pheo, you put a big sign right above the bed.

Do not palpate abdomen.

Hands off.

Hands off.

Got it.

Section 8.

The biggest topic in the entire chapter,

diabetes mellitus.

We need to be very clear here about the pathophysiological difference between type 1 and type 2.

Type 1 is an autoimmune disease.

The body's immune system aggressively attacks and destroys its own beta cells in the pancreas.

The result is absolute insulin deficiency.

The body makes zero insulin.

Type 2 is entirely different.

Type 2 is insulin resistance.

The pancreas is working,

it is often working overtime pumping out insulin, but the body's cells are completely ignoring it.

It is like the key is stuck in the lock and will not turn.

Let us focus heavily on type 1 as it is the predominant pediatric concern.

What is the classic initial presentation?

The three P's, polyuria peeing a lot, polydipsia drinking a lot, and polyphagia eating a lot.

Why the polyphagia?

If their blood sugar is so high, why are they starving?

Because the cells themselves are starving.

The sugar is trapped in the blood.

But without insulin acting as the key, it cannot get inside the cell.

So the cell sends desperate hunger signals to the brain.

But they lose weight anyway.

Despite eating constantly, the child loses weight rapidly because the body starts burning stored fat and muscle for energy just to survive.

Diagnosis is based on specific glucose levels.

A fasting glucose greater than 126.

Or a random draw over 200 with those classic symptoms.

Or an A1C over 6 .5%.

Let's talk management insulin.

The text has a massive table, table 18 -3.

We really need to break down the types because the timing is where nurses make all their medication errors.

It is all about the peak.

The peak is when the insulin is working its hardest to drop the sugar.

That is when the child is the absolute highest risk for a hypoglycemic crash.

Start with the rapid acting ones.

Lispro Humalog or Aspartan Ovalog.

Onset is fast 15 minutes.

This is the meal time insulin you give this with food.

Do not inject this and then let the kid go play in the hallway.

The food tray must be sitting right in front of them.

If they do not eat, they will crash immediately.

Then short acting.

Regular insulin.

Onset is 30 -60 minutes.

It peaks in 2 -4 hours.

Important exam note.

Regular insulin is the only one we can ever give IV.

If a kid is in the ICU, in DKA,

this is what goes in the IV drip.

Intermediate acting.

NPH.

The cloudy one.

It peaks in 4 -10 hours.

So think about the schedule.

If you give it at 8am, when is the danger zone?

Lunchtime or mid -afternoon.

Exactly.

So if that kid has gym class at 2pm, they are stacking the insulin peak directly on top of exercise, which also naturally lowers blood sugar.

That is a recipe for a severe low.

They must have a snack before gym.

And finally, long acting.

Glargine Lantus.

No peak at all.

It is a steady, continuous release over 24 hours.

This is the basal insulin.

It keeps the baseline steady.

And safety rule, you never mix this one in a syringe with any other insulin.

It precipitates and crystallizes.

Administration tips from the text.

Subcutaneous injection.

Rotate sites, religiously armed legs, belly to prevent lipal hypertrophy.

That is where the subcutaneous tissue gets lumpy and hard.

If you inject into a lumpy spot, the insulin just sits there and does not absorb predictably.

And double checks.

Always.

Insulin is a high alert medication.

Two RNs must independently verify the drawn dose before you give it.

Technology is really changing this landscape, right?

Insulin pumps.

Pumps are fantastic for kids.

They deliver a tiny continuous rate of rapid insulin acting as the basal.

And then the kid presses a button to bolus for meals.

It perfectly mimics a real pancreas.

But there is a risk.

It requires intense education.

Because if the pump fails or the tube kinks, they have absolutely no long -acting insulin on board as a backup.

They can go into DKA very, very fast.

Let us talk about the two major emergencies.

The lows and the highs.

Hypoglycemia first.

Low blood sugar, less than 70.

The classic mnemonic is cold and clammy, needs some candy.

What are the physical signs a nurse or teacher should look for?

They are shaky, sweaty, irritable, very pale, dizzy.

Tachycardia.

In a classroom, a teacher might just think the kid is acting out or throwing a tantrum or not paying attention.

But it is a medical crisis.

The treatment is the rule of 15.

Give 15 grams of fast -acting carbs.

That is four ounces of apple juice or three to four glucose tabs.

Can I give them a candy bar?

Avoid chocolate or milk initially.

Because the fat in those actually slows down the absorption of the sugar.

And you need it fast.

Then what?

Wait 15 minutes.

Recheck the finger stick sugar.

If it is still below 70, give another 15 grams of fast carbs.

Once it is safely above 70, you must give a complex carb and protein snack like cheese and crackers to keep it stable so they do not crash again.

What if you walk in and they are completely unconscious?

Never, ever put food or liquid in an unconscious patient's mouth.

They will aspirate and choke.

You give glucagon IM an injection or dextrose the firth if you already have a line.

Turn them on their side immediately because glucagon almost always causes violent vomiting.

Now the other extreme.

The absolute monster.

DKA, diabetic ketoacidosis.

This is a top tier medical emergency in the pediatric ICU.

Pathophysiology time.

The body has absolutely no insulin.

It cannot use sugar at all.

So it switches to plan B, burning stored fat for energy.

And burning fat creates dangerous race products.

Ketones.

Ketones are highly acidic.

So the blood turns acidic causing a severe metabolic acidosis.

And the sugar is still sitting high in the blood.

Sky high.

And the high sugar pulls water out of the cells via osmotic diuresis.

So the kid pees out massive amounts of fluids or crucial electrolytes.

So the triad is they are acidotic hyperglycemic and dehydrated.

Profoundly dehydrated.

What are the signs of DKA?

Fruity breath.

That is the acetone blowing off.

Cousmal respirations.

Deep, very rapid labored breathing.

They're trying to blow off CO2 to fix the acid in their blood.

Altered mental status confusion.

Management.

It is a very specific step by step sequence.

First priority is always fluids.

Isotonic fluids, normal saline.

You have to fill the vascular space first because they're in hypovolemic shock.

Then you give the insulin.

Yes, an IV regular insulin drip.

But you have to lower the sugar slowly.

If you drop the blood glucose too fast, water violently rushes back into the brain and causes fatal cerebral edema.

And here is the critical nursing point that kills patients if it is missed potassium.

The biggest trap in endocrine nursing.

Insulin drives sugar into the cell, but it also powerfully drives potassium into the cell.

So the serum potassium in the blood drops.

It crashes.

Even if their potassium looks totally normal on the lab report when they first come into the ER, as soon as you start that insulin drip, the potassium will bottom out.

Hypokalemia causes lethal heart arrhythmias.

So what do we do before starting insulin?

You must physically ensure the patient has peed, meaning their kidneys actually work.

And then you must start potassium replacement early, often adding it right to the IV fluids while the insulin is running.

Never start insulin if the potassium is already critically low.

Briefly touching on type 2 diabetes.

It is rising rapidly in kids due to the obesity epidemic.

It really is.

We look for a specific skin marker.

Acampus isnigricans.

That velvety dark thickened skin on the back of the neck and in the armpits.

That is the physical skin marker for severe insulin resistance.

Treatment for type 2.

Lifestyle changes are first line diet and exercise.

Then we use metformin.

Metformin helps the body use its own insulin better and decreases glucose production by the liver.

The main side effect parents need to know about is GI upset diarrhea is very common when starting it.

Sick day rules.

This applies to type 1 mainly.

When a diabetic kid gets the stomach flu, do they stop taking their insulin because they are throwing up and not eating?

No.

No, no, no.

This is the single most common and dangerous mistake parents make.

They think he is not eating, so no insulin.

Dead wrong.

Why is that wrong?

Because illness is a severe physical stress.

Stress naturally releases cortisol.

Cortisol violently raises blood sugar.

Even if they are not eating a single bite, their sugar can skyrocket just from the infection.

So they need it.

They desperately need the basal insulin to prevent slipping into DKA.

You might adjust the rapid doses based on what they eat, but you never completely stop it.

Check keycones, force fluids, monitor the sugar every three hours around the clock.

Section 9, safety and case study.

The text touches briefly on childhood obesity.

It emphasizes building healthy long -term habits, not just putting kids on restrictive weight loss diets.

60 minutes of activity a day.

It clearly links childhood obesity to type 2 diabetes and early heart disease.

It is a sensitive conversation for a nurse to have, but it is absolutely vital.

And finally, the case study at the end of the chapter, Mallory.

She is a 15 -year -old.

She has Graves' disease, hyperthyroidism.

And she ends up in a full -blown thyroid storm in the ER.

Why?

Well, scenario says she was too busy with school and friends and forgot her meds.

Classic adolescents.

She is 15.

Compliance is the absolute biggest hurdle in pediatric nursing for this age group.

Adolescents have a developmental sense of invincibility.

They do not want to be different from their peers.

Taking daily pills constantly reminds them that they are sick.

And the result of skipping them was a racing heart, severe diarrhea, high fever, the storm.

It beautifully highlights that treating the endocrine disorder is also about treating the whole developmental child.

You have to negotiate with a teenager.

You cannot just order them to take a pill.

You have to help them take ownership of their own health.

So we have covered a massive amount of material today, from the thermostat in the brain to the sugar in the blood.

What is the big overarching takeaway for the student?

The takeaway is balance.

The endocrine system is the body's master regulator.

When it is off there,

the symptoms are very predictable if you truly know the underlying physiology.

Too much hormone things speed up or grow too big.

Too little things slow down or stop growing entirely.

And for the nurse at the bedside?

It is about extreme vigilance.

Watching the growth chart carefully.

Catching the subtle signs of hypoglycemia before a seizure hits.

Teaching the parents relentlessly about stress dosing.

You are the safety net for these kids.

You are the one who ensures that a simple childhood fever does not turn into a funeral for a kid with Addison's disease.

It is incredibly high stakes, but you now have the tools to manage it safely.

I want to leave you with a final thought to mull over.

We've focused so much on the medical management, but think about the lifelong impact.

Think about the psychological burden on a young child whose entire existence suddenly revolves around numbers injections and strict schedules.

Think about the incredible resilience they have to build and the overwhelming support the entire family needs to manage chronic conditions like diabetes or CAH every single day.

It changes their whole world.

It really does.

And that wraps up our deep dive into Chapter 18.

Good luck with the exam tomorrow.

You have totally got this.

Thanks for listening to this deep dive from the Last Minute Lecture Team.

Go crush it.