Chapter 24: Antiinflammatory Drugs & Corticosteroids

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Welcome back to the Deep Dive.

Today we are, we're shifting gears a little bit.

Yeah, usually we take this big, you know, wide angle look at a topic, a cultural trend or something in tech.

But today,

today we're turning the studio into a study hall.

I like that.

A study hall.

We're doing something very specific and honestly pretty high stakes for a big chunk of our listeners.

It's a different kind of deep dive, isn't it?

We're narrowing the aperture.

Instead of a wide lens, we're pulling out the microscope.

Exactly.

We're looking at one specific chapter from one specific textbook.

Which is chapter 24, anti -inflammatories.

That's the one.

From the textbook Pharmacology, a patient -centered nursing process approach, the 12th edition.

We know we have a ton of nursing students out there listening, maybe some nurses who just want to, you know, a solid refresher.

So we're framing this as a last -minute lecture.

Oh, that's the perfect name for it, the last -minute lecture.

It's for that moment, right before the exam, when you've read everything, you've highlighted half the book, but you just need to hear it out loud to make it all click.

To make the connection stick, yeah.

And hey, even if you're not a nursing student, if you're just someone with a bottle of Advil in your cabinet wondering what it's actually doing in your body, you're going to get a lot out of this.

For sure.

But I want to set some ground rules.

Our goal today is fidelity.

We're sticking to the text.

We're going to translate chapter 24 into a conversation.

But we're not going off -script with, like, personal stories or random stuff from the internet.

Which is so important in pharmacology.

You can't mix internet myths with clinical science.

That's how people get hurt.

So we're going to stick to the concepts, the drug classes, the mechanisms exactly as they're laid out in the chapter.

So here's the roadmap for this deep dive.

We're following the chapter structure to a T.

We'll start with the physiology of inflammation, like what's actually happening when you sprain your ankle.

The why.

The why.

Then we'll get into the heavy hitters and SAI's.

And we're going to spend a lot of time there because there's so much to unpack, you know, the different generations, the side effects.

Oh yeah, it's a huge category.

We really have to break down the difference between something old school like aspirin and the newer drugs.

It's not just marketing, it's real biology.

Exactly.

Then we'll touch on corticosteroids.

We'll explore something called DMARDS, which are for rheumatoid arthritis.

And then we'll finish up with gout.

It's a packed agenda.

It is.

So let's just jump in.

Let's do it.

Okay, so let's set the stage.

You have a tissue injury.

Maybe you, you know, stub your toe, get a paper cut, whatever.

The text calls this the trigger.

But what is happening on a microscopic level right after that?

Well, the first thing the book does, and it's a critical distinction, is separate the idea of inflammation from infection.

Right, because we use those words interchangeably all the time.

Oh, that cut looks inflamed, it must be infected.

Exactly.

But they're not the same thing.

The text defines inflammation specifically as a response to tissue injury.

It's a reaction.

Infection, on the other hand, is caused by microorganisms, bacteria, viruses.

So an infection causes inflammation.

An infection causes inflammation, yes.

But here's the key point the book makes.

Not all inflammation is caused by infection.

So my stubbed toe is inflamed, but it's not infected unless I, what, broke the skin and bacteria got in?

Precisely.

Trauma,

a surgical incision, even extreme heat or cold, all of those cause inflammation without a single micro being involved.

The process itself is actually protective.

Your body's trying to neutralize whatever is harmful and get the site ready for repair.

It's funny because when my knee swells up, it feels like my body is punishing me, not trying to help me.

It's a defense mechanism, it's just a very blunt one.

And that's why we have the drugs.

But to get the drugs, you have to understand the chemical mediators, these are the molecules that get released the second that injury happens.

The text lists three main players, histamines, kinins, and prostaglandins.

It feels like a relay race.

It's a cascade.

Think of it like your body's emergency broadcast system.

The tissue gets damaged and it sends out an immediate alert.

The very first siren is histamine.

Histamine, the first responder.

Right.

And it does two things right away.

It causes dilation of the arterioles.

Which means the blood vessels get wider?

Yep, it opens up the highways to get more blood to the area.

And second, it increases capillary permeability.

Capillary permeability?

That always sounded so dry in the textbook.

What does that actually look like?

Imagine your blood vessels are like a garden hose.

Permeability means that hose suddenly develops a bunch of tiny little holes.

Okay.

So fluid and protein and white blood cells start leaking out of the hose and into the surrounding tissue.

And that's the swelling.

It's just fluid physically leaking out of the pipes.

That's the swelling.

That's the edema we'll talk about.

The body is flooding the zone to wash away toxins and let the white blood cells get to the battlefield.

So histamine is the opener.

Who's next?

Next up are the kinins.

The book specifically points to bradykinin.

Bradykinin.

What's its job?

It also increases permeability,

but it adds a crucial new element.

It causes pain.

It causes pain.

Why would your body release a chemical specifically to make you hurt?

It's a signal.

It stimulates the nerve endings to tell your brain,

hey, stop.

Don't use this part of your body.

It's damaged.

Pain is a feature, not a bug.

A protective mechanism.

100%.

And then finally, we get to the stars of this chapter, prostaglandins.

The ones that all the drugs are targeting.

They're the main event in pharmacology.

They do a bit of everything, vasodilation, increasing permeability.

But crucially,

they sensitize the nerve cells to pain.

They basically turn up the volume on the pain signal that bradykinin started.

So you have this chemical soup swirling around the injury, which leads directly to what the text calls the cardinal signs of inflammation.

I feel like table 24 .1 is a classic exam question.

Oh, absolutely.

You have to know the five signs.

Erythema, edema, heat, pain, and loss of function.

But don't just memorize the list.

Connect them back to what we just talked about.

OK, let's walk through it.

Erythema.

That's redness.

Redness.

That's from the vasodilation we mentioned.

The arterioles are wider, so more blood is rushing to the area.

More blood, more redness.

Simple as that.

Next is edema, or swelling.

And that's our leaky hose.

The plasma leaking out into the tissue because of the increased permeability from histamine and kinins.

And then we have heat.

Heat comes from that rush of warm blood to the surface.

But the book also says it can come from pyrogens, which are fever -producing substances that mess with the thermostat in your hypothalamus.

And pain.

Pain is a double whammy.

It's the physical pressure from the swelling pushing on nerves, and it's the chemical irritation from the kinins and prostaglandins directly stimulating those nerves.

And all of that leads to the final sign.

Loss of function.

Right.

Which is just a consequence of the other four.

Your ankle is swollen and painful, so you can't walk on it.

You've lost the function.

So, before we get to the drugs that stop this, we have to talk about one specific enzyme.

This seems to be the absolute key.

COX cyclooxygenase.

This is it.

If you understand COX, you understand the entire chapter.

COX is the enzyme that converts a substance called arachidonic acid into those prostaglandins we just talked about.

Okay, so follow the logic.

Prostaglandins cause inflammation and pain, and COX is the enzyme that makes prostaglandins.

So if you can block the COX enzyme...

You block the prostaglandins, and if you block the prostaglandins, you block the inflammation and the pain.

That is the fundamental mechanism of action for NSAIDs.

But it's not quite that simple, is it?

Because the text makes a really big deal about there being two types of COX.

No, and this is probably the most important concept for understanding side effects in this entire deep dive.

There are two forms.

COX -1 and COX -2.

Let's do COX -1 first.

Think of Keoglass as the good housekeeper.

It's always on, working in the background.

It has protective functions.

Specifically, it protects the stomach lining by producing mucus, and it helps regulate blood platelets to promote clotting.

So COX -1 is keeping my stomach from digesting itself and making sure I can form a scab if I get a cut.

Sounds pretty important.

Very important.

Now COX -2.

Think of COX -2 as the bad trigger.

It's the one that gets induced at the site of an injury to cause inflammation and pain.

So in a perfect world, if I have a headache, I only want to block COX -2.

I want to stop the pain, but I want to keep my stomach protection and my blood clotting.

That's the dream.

You want to fire the troublemaker, but keep the housekeeper.

But as we're about to see, our classic first -generation drugs are non -selective.

They're like a shotgun.

They take out both.

And when you take out COX -1, you get the side effects.

That's where they come from.

You lose the stomach protection and you inhibit platelet aggregation.

Which is the perfect segue to our first major drug class,

NSAIDs, non -steroidal anti -inflammatory drugs.

Right.

The text defines them pretty simply as prostaglandin inhibitors.

And why non -steroidal?

It's to distinguish them from corticosteroids, like cortisone.

They have similar anti -inflammatory effects, but they're not chemically related at all.

They don't have that steroid structure.

Okay.

And the text lists four main properties for this class.

You got to know these four.

They are anti -inflammatory, so they reduce swelling,

they're analgesic, meaning they relieve pain, they're antipyretic, so they reduce fever, and they're anticoagulant, because they inhibit platelet aggregation.

Got it.

The book also notes that they're really best for things like swelling, joint stiffness, and pain, and maybe not the first choice for just a mild headache.

Right.

For a mild headache or fever, acetaminopin or aspirin are often preferred.

NSAIDs are really for when that inflammatory component is significant.

Now, the chapter divides NSAIDs into six groups, and it splits them into first generation and second generation.

The first -gen drugs are the shotguns.

They inhibit both Keo -X1 and Keo -X2.

That's most of them.

The second -gen drugs are the selective Keo -X2 inhibitors.

Okay, let's start with the grandfather of them all.

Group one, salicylates,

specifically aspirin.

Acetyl salicylic acid, or ASA, the oldest anti -inflammatory agent developed way back in 1899.

That's incredible.

It's still a prototype drug.

It is, and it's a prostaglandin inhibitor, but it has a really unique role because it's so effective as an anti -platelet drug.

It's used for cardiac and stroke prevention.

Because it thins the blood by stopping platelets from clumping.

Exactly, and that's why the text has a huge warning.

Do not take aspirin with other NSAIDs.

They can decrease the effectiveness, and you just pile on the side effects.

Let's talk about taking it.

The text mentions it causes a lot of GI distress.

Anorexia, nausea, vomiting, pain.

That's the Keo -X1 inhibition at work.

So the advice is always to take it with water, milk, or food to buffer the stomach.

Or use the enteric -coated tablets, the EC ones.

Right, and enteric coating is like a special wrapper on the pill that doesn't dissolve in the acid of the stomach.

It waits until it gets to the more alkaline, small intestine, so it spares the stomach lining that direct irritation.

Now aspirin has some really serious warnings.

Let's start with pregnancy.

This is a huge one.

Absolutely contraindicated in the last trimester of pregnancy.

Why?

What's the specific mechanism?

It can cause premature closure of the ductus arteriosus in the fetus.

That's the little blood vessel that allows blood in the fetus to bypass the lungs, which aren't being used yet.

If that closes too early, it's a major problem for fetal circulation.

That is terrifying.

Okay, and the other big one, the pediatric warning about Ray syndrome.

Ray syndrome.

This is non -negotiable.

You never, ever give aspirin to a child who has flu or virus symptoms.

It's a rare but potentially fatal condition that causes swelling in the liver and the brain.

So if a kid has a fever from a virus, what's the alternative?

Acetaminophen.

The text says it's usually prescribed for this exact reason.

You just don't take the risk with aspirin in kids.

What about toxicity in adults?

How do you know if you've taken too much?

The classic signs of what we call salicylism are tinnitus.

Ringing in the ears.

Ringing in the ears and vertigo, which is dizziness.

If a patient is on high -dose aspirin and they report ringing in their ears, that's a red flag.

It means their serum levels are too high.

And the nursing process section gives us those levels.

It does.

Therapeutic range is 15 to 30 milligrams per deciliter.

Mild toxicity is over 30 and severe is over 50.

As a nurse, you're monitoring for that and you're monitoring for signs of bleeding.

Like what?

Dark, tori stools, bleeding gums, petechiae, which are those little red dots on the skin, or ecchymosis, which is just excessive bruising.

Okay, I want to pause on a term here that always trips students up.

The text says aspirin is highly protein -bound.

Can you break that down for us?

Yes.

This is one of the most important concepts for understanding drug interactions.

Okay,

imagine your bloodstream is a bus.

Okay, I'm on the bus.

And on this bus, there are a limited number of seats.

Those seats are protein molecules, mostly albumin.

Got it.

When you take a highly protein -bound drug like aspirin, the drug molecules get on the bus and they immediately look for a seat.

They bind to the protein.

And while they're sitting in the seat, they're not active.

Bingo.

That is the key.

While they're bound, they're just in reserve.

Only the free drug, the molecule standing in the aisle, are actually active and having an effect.

So the dose is calculated knowing that only a small percentage will be free and working.

Exactly.

But here's where it gets dangerous.

What happens if you take another drug that's also highly protein -bound, like the blood -thinner warfarin?

They have to fight for the seat.

They fight for the seats.

And aspirin is a bully.

It has a higher affinity for the protein.

So it gets on the bus and it shoves warfarin out of its seat.

So now you have way more free warfarin floating around in the aisle.

You have a lot more free active warfarin than you're supposed to.

You've essentially just created an overdose of the blood -thinner, not by taking more of it, but by adding another drug.

And that leads to a massive bleeding risk.

A massive bleeding risk.

That's why that interaction is so critical.

And it's also why you have to stop aspirin about seven days before surgery.

You need to give the body time to make new platelets that aren't affected.

Wow.

Okay, that makes so much more sense.

Let's move to group two.

Parachlorobenzoic acid.

The prototype is Indomethacin.

Indomethacin.

This one is a very potent prostaglandin inhibitor.

It's used for RA, gout, that sort of thing.

But it is very, very irritating to the stomach.

The text is clear.

It must be taken with food.

No exceptions.

And it's also highly protein -bound.

Ninety -nine percent.

So that same displacement risk applies.

The text also mentions a couple of derivatives, Cilindac and Etodinolac, that are a little less harsh, but you still have to watch for fluid retention.

Okay, group three.

This is the big one.

Propionic acid derivatives.

This is ibuprofen.

This is what most people have at home.

The book calls them the newer aspirin -like drugs.

Stronger effects, less GI irritation than aspirin.

This group includes ibuprofen, niproxen, ketoprofen.

And ibuprofen is the most common.

Let's look at its prototype drug chart.

The interactions list is long.

It is.

It increases the effects of warfarin.

There's that protein -binding issue again.

It can also increase levels of phenytoin, a seizure med.

But interestingly, it decreases the effect of aspirin.

If you're taking low -dose aspirin for heart protection, taking ibuprofen can actually get in the way and block the aspirin from binding to the platelets.

It can interfere with that cardioprotective effect.

That is huge.

I had no idea.

It's a big deal.

The chart also mentions a hypoglycemia risk.

Yes.

If you take it with insulin or other oral diabetes meds, it can potentiate their effect and drop your blood sugar too low.

And there's a specific herbal alert.

Right.

Dongkuai, feverfew, garlic, ginger, and ginkgo.

Remember the Gs.

They all have anticoagulant properties.

So when you combine them with an NSAA, you're really increasing that bleeding risk.

You have to ask patients about supplements.

So for the nursing process with ibuprofen, what are the key teaching points?

Always take it with meals.

Avoid alcohol.

That just adds to the gastric irritation.

And let your dentist or surgeon know you're taking it.

Oh, and for women, the book notes to avoid it for a day or two before menstruation as it can cause heavier flow.

And watch for swollen ankles.

Yep.

Peripheral edema.

NSAA's can make you retain sodium and water.

Okay.

Quick hits on the next two groups.

Group four, phenamates.

These are potent NSAI's for arthritis.

The big takeaway here is the warning.

If you have a history of teptic ulcers, you should avoid this class entirely.

And group five, oxicams, peroxocam, and myloxocam.

Their main advantage is a long half -life.

That means you can take them just once a day, which is great for patient compliance.

But you have to tell patients it can take one to two weeks to feel the full effect.

They have to stick with it.

So that covers the five groups of first -generation NSAI's.

The common theme is they all block KeoX1 and KeoX2.

And so the common side effects are gastric irritation and bleeding risk.

Which brings us to the supposed solution.

Group six, second -generation NSAI's.

The selective COX2 inhibitors.

The pharmacological breakthrough.

The idea here is selective inhibition.

These drugs were designed to only block KeoX2, the bad enzyme that causes pain, and leave KeoX1, the good housekeeper, alone.

So in theory, no more stomach ulcers.

Exactly.

The main drug here is Celecoxib.

The big benefit is you get the pain relief without the gastric bleeding.

It sounded like a miracle drug.

But there's always a but in pharmacology, isn't there?

There is always a trade -off.

And this one is a big one.

It's the contraindication that defines this class.

Go on.

Because you are leaving KeoX1 alone, you are not inhibiting platelet aggregation.

The blood is not getting thinned.

Okay, so if you're a healthy person with arthritis, that sounds great.

You get pain relief and your stomach is safe.

Correct.

But what if you're a patient with heart disease who is taking aspirin or ibuprofen?

You were getting a secondary benefit from that KeoX1 inhibition.

The anti -clotting effect was protecting you from a heart attack or stroke.

I see it now.

If you switch that patient to Celecoxib...

You take away that protection.

You've fixed their stomach.

But you might have just increased their risk of a fatal blood clot.

So you're trading ulcer risk for clot risk.

You are.

And the text is explicit.

Patients at risk for stroke or heart attack who need aspirin for its anti -platelet effect will not benefit from CeoX2 inhibitors.

It's a critical piece of clinical judgment.

The book also mentions a fascinating cancer connection.

Yeah, it's a theory that because CeoX2 is involved in cell growth, blocking it might help prevent certain cancers like colon cancer.

And it notes the things that fruits and vegetables are natural CeoX2 inhibitors, which is pretty cool.

Before we leave NSAIDs, there's a section on older adults.

A very vulnerable group.

The text says GI distress is four times more common in seniors.

You have to evaluate the renal function, make sure they're hydrated.

The general rule is to start with a lower dose.

Start low and go slow.

That's the mantra.

OK, let's move on to the next major category in the chapter, corticosteroids.

The scaroids.

We're talking about drugs like prednisone, prednisolone, dexamethasone.

How do these work?

They are incredibly powerful anti -inflammatories.

They suppress multiple components of the inflammatory process right at the site.

If an NSAID is a garden hose, a corticosteroid is a fire hydrant.

But the text says they aren't the first choice for chronic arthritis.

Right, because of the side effects.

Long -term use can cause fluid retention,

immune suppression, mood changes, thinning skin, all sorts of problems.

So they're usually used for acute flare -ups to get the inflammation under control quickly.

And there's a huge warning about stopping them.

Tapering.

Tapering is non -negotiable.

If a patient has been on long -term steroid therapy, you must taper the dose down slowly over five to 10 days.

You never ever stop abruptly.

And why is that?

It can cause an adrenal crisis.

When you take steroid pills, your body's own adrenal glands stop making their natural cortisol.

They go to sleep.

If you suddenly stop the pills, your glands are still asleep, and your body has zero cortisol, which is a life -threatening emergency.

Tapering gives the glands a chance to wake back up.

Got it.

OK, so what happens when NSAIDs aren't enough for something like rheumatoid arthritis?

That's where DMARDS come in.

DMARDS.

Disease Modifying Anti -Urematic Drugs.

As the name implies, they don't just treat the symptoms like NSAIDs do.

They actually try to modify or slow down the disease process itself.

The book says they're more toxic, though.

They are.

They are a step up in intensity.

The chapter breaks them into three types.

Immunosuppressives, immunomodulators, and anti -malarials.

Let's start with immunosuppressives.

The drugs listed are azathioprine, cyclophosphamide, methotrexate.

The book says these are primarily cancer drugs.

They are.

They're chemotherapy agents.

But in much lower doses, they're used for what's called refractory RA.

That's rheumatoid arthritis that isn't responding to anything else.

They work by suppressing the overactive immune system that's attacking the joints.

OK, then we have immunomodulators.

The text calls them cytokine blockers.

This sounds very high tech.

It is.

This is biologic therapy.

It targets specific proteins in the immune system.

The text mentions two types.

First, IL -1 receptor antagonists like anakinra.

IL -1 is a cytokine that destroys cartilage.

And this drug basically blocks the keyhole so IL -1 can't get in.

And the other type.

TNF blockers.

TNF stands for tumor decrosis factor, another inflammatory protein.

Drugs like etanercept, infliximab, and nadalimab work by grabbing onto TNF and neutralizing it.

There's a prototype chart for infliximab.

It looks like there's a lot to monitor here.

There is.

It's given by IV infusion.

And because you're suppressing the immune system, the big risk is severe infections.

We're talking tuberculosis, fungal infections.

So screening is critical before you even start.

Absolutely.

The text says a patient must have a negative TB test before starting.

If they have latent TB, a drug like this could allow it to become active and fulminant.

And during the infusion, you're watching for a reaction.

Yep, you're watching for chest pain, fever, chills, shortness of breath.

If any of that happens, you stop the infusion.

Patients also need to be taught to avoid live vaccines while they're on these drugs.

Okay, and the third type of DMARD is antimalarials.

Yeah, this one's interesting.

The mechanism isn't totally clear, but drugs used for malaria have been found to suppress the symptoms of RA.

It takes a long time to work, 4 to 12 weeks.

So they're usually used with an NSAA.

All right, we are in the home stretch.

The final section of Chapter 24 is on anti -gout drugs.

Gout.

A very specific and very painful type of inflammatory arthritis.

Usually hits the big toe.

And the cause is a defect in purine metabolism.

Right.

It leads to hyperuricemia, which is just too much uric acid in the blood.

When there's too much, it can't stay dissolved, so it crystallizes out.

It forms sharp needle -like crystals in the joints.

Exactly.

And that's what causes the intense inflammation and pain.

Sometimes you can even see them form bumps under the skin called TOFI.

Before we get to the drugs, the text emphasizes diet and fluids.

Hugely important.

Drinking a lot of fluid helps flush out the uric acid.

And patients need to avoid high purine foods because purines are what break down into uric acid.

What's on the avoid list?

Things like organ meats, sardines, salmon, gravy, liver,

and alcohol, especially beer, is a major trigger.

And for pain, the book specifically says not to use aspirin.

Right.

Which seems counterintuitive.

But salicylic acid actually causes uric acid retention, making the problem worse.

Acetaminophen is the better choice for pain relief during a gout attack.

Okay, so let's hit the three types of gout drugs.

First up, colchicine.

Colchicine is purely an anti -inflammatory gout drug.

It works by stopping white blood cells from rushing to the side of the crystals.

It calms the inflammation down.

But it doesn't actually lower the uric acid levels.

Correct.

That's its limitation.

It's for treating the acute attack, the fire.

It doesn't deal with the underlying fuel.

And it has a lot of GI side effects.

Nausea and diarrhea are very common.

Okay, so to deal with the fuel, we have the xanthine oxidase inhibitors like allopurinol.

Now we're getting at the cause.

These drugs inhibit the production of uric acid by blocking the enzyme that makes it.

So allopurinol isn't an anti -inflammatory.

It's a preventative drug.

And what are the nursing considerations for it?

The book notes that patients need yearly eye exams, as it can cause visual changes.

And again, increase fluid intake to prevent the uric acid from forming kidney stones.

And finally, we have the uricocerics, like probenicid.

This is the third mechanism.

Uricocerics work by increasing the excretion of uric acid.

They block its reabsorption in the kidney, so you just pee more of it out.

And the big interaction warning.

Don't take it with aspirin.

Aspirin negates the effect of probenicid.

Wow.

Okay, that's the physiology.

Six groups of NSAIDs, corticosteroids, three types of DMRs, and the three -pronged approach to gout.

It's a dense chapter, but you can see the logic, right?

It's all about interrupting that inflammatory cascade at different points.

It is.

The chapter ends with a case study of a 72 -year -old patient who was taking a lot of aspirin for arthritis and developed a peptic ulcer.

And that brings it all full circle.

Why did she get the ulcer?

Because the aspirin is non -selective.

It blocked COX -1.

It turned off the good housekeeper.

It took away her stomach's natural protection while it was treating her pain.

And the question the book asks is, how could that have been prevented?

Well, based on what we've talked about, maybe a different drug choice, like a COX -2 inhibitor, if her cardiac risk was low.

Or using an enterocoded tablet.

Right, or just better teaching about taking it with food and monitoring for those early signs of GI distress.

It really highlights the nurse's role as that safety net.

It's a constant balancing act.

Balancing pain relief with organ protection, stomach, kidneys, heart.

It's about knowing the mechanism so you can anticipate the risk.

Well, that was our deep dive into chapter 24.

A huge thank you to all the students and nurses out there listening.

We know you're doing the hard work.

Absolutely.

Keep studying and keep making those connections.

This has been the Last Minute Lecture Team signing off.

Good luck on the exam.