Chapter 33: Concepts of Care for Patients With Vascular Problems

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Welcome to the Deep Dive.

We take dense clinical material like that big vascular chapter in Medsurg and, well, we boil it down.

Right, we find the absolute must -knows for you, whether it's for class, clinicals, or just getting a handle on it all.

Today we're hitting the big ones, perfusion and clotting.

And that crucial link connecting them, inflammation.

We're pulling this straight from the text, the key path of physiology, what to look for in assessment, and those priority nursing actions.

Yeah, we want to get past just listing facts.

We're focusing on why it matters clinically, and we'll start with the most common perfusion issue out there, hypertension.

Exactly.

So, systemic arterial blood pressure, BP, it seems simple, right?

Cardiac output times peripheral vascular resistance.

Deceptively simple.

Because the regulation, that's complex.

It really is.

You've got four major control systems keeping that BP in check.

But clinically, what's the failure point?

What usually goes wrong first in essential hypertension?

Okay, good question.

For essential or primary hypertension, the kind without one single cause, two systems are often key players in the breakdown.

First, those arterial barrel receptors.

They sense the pressure, right?

They should.

They should sense high pressure and trigger vasodilation to lower it.

But in hypertension, they just get less effective, less sensitive.

Okay, so that's one.

What's the second?

The other big one is often inappropriate activation, or maybe over -activation, of the renin -angiotensin -aldosterone system, you know, RAAS.

RAAS.

That one always seems to trip people up.

Can you just boil down its main job?

Is it basically turning up the volume on vasoconstriction?

That's a great way to put it.

The kidneys release renin.

That kicks off the cascade, leading to angiotensin the second, which is a very potent vasoconstrictor.

It really spikes BP.

And when that system stays overactive or the pressure stays high for too long?

Exactly.

That constant high pressure damages the vessel walls.

It leads to something called medial hyperplasia, basically.

The arterials thicken up.

That thickening, that damage, that's the start of long -term problems, organ damage.

Precisely.

And that's where inflammation really comes into play, too, driving that damage.

So essential hypertension is this chronic failure, inflammation, driven by risk like age, family history, smoking, obesity.

Right.

Whereas secondary hypertension, that has a specific cause.

You can often pinpoint maybe kidney disease, an adrenal gland issue, even certain meds, like some birth control pills.

Okay.

And we need to talk about the emergency situation, hypertensive crisis.

Yes.

Absolutely crucial.

Also called malignant hypertension.

This is BP soaring over 180, 120.

It's a true medical emergency.

What are the warning signs?

Think morning headaches, maybe severe ones, blurred vision, shortness of breath that comes on suddenly.

If you see that picture with that BP, you have to act fast.

Because the risk is?

Kidney failure, stroke.

Direct consequences if that pressure isn't brought down quickly and safely.

Got it.

Now, for assessment of just chronic hypertension,

most people don't have symptoms, right?

That's true.

Often asymptomatic.

If they do have symptoms, they might be subtle headache, maybe some facial flushing, dizziness, feeling faint sometimes.

And a key nursing priority?

Always get BP in both arms.

A significant difference could mean something else is going on, like arterial narrowing.

Okay.

Both arms.

And what about orthostatics?

Critical.

You have to check for orthostatic hypotension, measure the BP lying down, then sitting, then after they've been standing for about three minutes.

We're looking for that drop.

Yes, that specific drop.

20 millimeters of mercury systolic or 10 diastolic when they stand up.

It's so often missed, but it's a major safety check, especially when starting meds.

Right.

So management.

It always starts with lifestyle, doesn't it?

Always the foundation.

We're talking the DSH diet, lots of fruits, veggies, low -fat dairy, high in potassium, calcium, magnesium,

and cutting back sodium.

What's the ideal sodium goal?

Ideally less than 1500 milligrams a day, plus weight reduction if needed, regular physical activity.

And then if lifestyle isn't enough, we move to medications.

What are the first line classes?

Usually thiazide type diuretics, calcium channel blockers, CCBs, ACE inhibitors, or ARBs.

But with meds come safety alerts.

Okay, let's hit those.

Diuretics first.

Especially lup and thiazide diuretics, the big risk is hypokalemia, low potassium.

You absolutely have to monitor for it.

Slumping.

Irregular pulse, muscle weakness,

and you need to teach patients to eat potassium -rich foods, bananas, potatoes, spinach.

And a specific warning for older adults with lup diuretics.

Yes, dehydration and fall risk.

That orthostatic drop can be more pronounced.

You need to be really cautious.

Got it.

What about ACE inhibitors, the mayaprules?

The most common side effect, the one patients complain about most, is that nagging, persistent, dry cough.

This doesn't sound serious.

But it's incredibly annoying.

So much so that patients might just stop taking a crucial medication without telling anyone.

If that cough develops, the drug usually needs to be changed.

Good point.

And another ACE inhibitor safety tip.

That first dose hypotension.

When starting any BP med, really, but especially ACE inhibitors, tell patients to get up slowly.

Sit on the edge of the bed first.

Avoid that sudden drop.

Okay, that makes sense.

So let's connect this back.

Chronic hypertension, inflammation, vessel damage.

That really sets the stage for atherosclerosis, doesn't it?

Leading us into arterial disease.

Perfectly connected.

Atherosclerosis is specifically about plaque buildup, which is the main driver of cardiovascular disease.

Atherosclerosis is more general hardening or thickening.

So what's the process for atherosclerosis?

How does that plaque form?

It starts with damage to the vessel wall, often from things like hypertension or smoking.

Then inflammation kicks in.

That leads to a fatty streak forming in the vessel lining.

It is fat.

Initially, yeah.

But then it develops into a more complex fibrous plaque.

Think scar tissue mixed with lipids and inflammatory cells.

And the real danger point is when that plaque becomes unstable.

Exactly.

An unstable plaque can rupture.

When it ruptures, the body sees it as an injury and forms a clot, a thrombus, right there.

Very quickly.

Which blocks the artery.

Instantly blocks blood flow.

And that causes acute ischemia downstream.

If it's in the heart, it's a myocardial infarction and MI.

If it's in the brain, it's a stroke.

So that chronic inflammation suddenly becomes an acute clotting event.

Wow.

Okay, how do we assess for this kind of arterial compromise?

Maybe in the legs or arms?

You're looking for differences.

Check skin temperature one leg cooler than the other.

Check capillary refill time.

It should be quick, less than three seconds usually.

Maybe up to five in older adults.

Longer than that suggests poor arterial flow.

And listening.

Yes.

Listen with your stethoscope over large arteries, carotid, femoral aorta.

If you hear a brute, that turbulent swishing sound, it suggests narrowing turbulence from plaque buildup.

And the absolute must do.

Check pulses.

Always.

Compare side to side.

A weak, diminished, or especially an absent pulse is a red flag for acute arterial occlusion.

That needs immediate reporting.

Critical rescue.

Okay, let's focus that down into peripheral arterial disease, or PAD.

That's atherosclerosis, specifically limiting flow to the extremities.

How is it classified?

We usually talk about inflow versus outflow disease.

Influbstructions are higher up aorta, iliac arteries, pain tends to be in the lower back, buttocks, thighs.

And outflow.

Outflow is lower down femoral popliteal tibial arteries.

Pain is more in the calves, ankles, feet, toes.

Outflow disease often causes more significant tissue damage because it's further down the line.

What's the classic symptom we need to recognize for PAD?

Intermittent claudication.

That's the hallmark.

It's muscle pain or cramping in the legs, usually the calf, that comes on reproducibly after walking a certain distance.

And it goes away with?

Rest.

Predictably relieved by rest, that's key.

And as PA gets worse?

Patients can develop rest pain.

This is different.

It's often a numb, burning or aching pain, usually in the toes or forefoot, that occurs even without activity, maybe waking them up at night.

How do they get relief?

Often by dangling the leg over the side of the bed.

Gravity helps pull a little more blood down.

How is PAD definitively diagnosed?

The standard is the ankle brachial index, the ADI.

It's simple.

You measure the systolic BP at the ankle and compare it to the systolic BP in the arm.

And the number we're looking for?

An ABI less than 0 .90 is diagnostic for PAD.

Okay, so management priorities for PA?

Exercise is actually really important, but it's specific.

We want them to build collateral circulation, new little blood vessels around the blockages.

How do they do that?

Instruct them to walk until the claudication pain starts, then stop and rest until it's gone, then walk just a little bit further, repeat.

It's structured, progressive exercise.

What about positioning?

This is crucial and counterintuitive for some.

They should avoid elevating their legs significantly above heart level.

Gravity helps arterial flow down to the feet.

Don't hinder it.

Makes sense.

And promoting vasodilation.

Keep the extremities warm, wear socks, avoid cold exposure, and the absolute non -negotiable.

Stop smoking and all tobacco use completely.

Why is smoking so bad here?

Massive vasoconstriction.

Just one cigarette can clamp down arteries for up to an hour, drastically reducing blood flow.

They have to quit.

If lifestyle and meds aren't enough, there are procedures.

Yes, things like percutaneous vascular intervention, maybe angioplasty, putting in a stent, or atherectomy to remove plaque.

Post -procedure priorities.

Monitor that puncture site closely for bleeding or hematoma.

And watch for signs of hypovolemic shock, low BP, high heart rate if there's significant bleeding.

And surgical option.

Arterial revascularization, usually bypass grafts, using a vein or synthetic tube to go around the blockage.

Post -op care for bypass is critical.

Extremely.

The biggest immediate risk is the graft clotting off.

So you're checking that limb constantly right after surgery,

temperature, capillary refill, and especially the pulse distal to the graft.

How often?

Every 15 minutes for the first hour, then hourly, then tapering down.

But frequent checks are key early on.

What's the sign of a graft occlusion?

Severe aching pain in the operative leg that wasn't there before, or is much worse than the expected post -op pain.

That's often the first sign.

It's a surgical emergency that graft needs to be saved immediately.

Okay.

Need to remember that severe ache.

Let's quickly touch on acute arterial events.

Acute arterial occlusion, sudden blockage.

What usually causes it?

Most often it's an embolus, a clot that traveled from somewhere else.

Maybe the heart during atrial fibrillation or after an MI.

And the signs?

Remember the six P's of ischemia.

Pain, severe, sudden.

Pallor, pale skin.

Pulselessness, no pulse below the blockage.

Parasthesia, numbness, tingling.

Paralysis, weakness, inability to move.

And pochylothermia, coolness.

The limb takes on ambient temperature.

Six P's.

Got it.

Treatment.

Immediate anticoagulation, usually IV heparin, is started right away to prevent the clot from getting bigger.

Then often thrombectomy, surgically removing the clot, or thrombolytics, clot busting drugs.

Time is tissue here.

Okay.

And briefly, aneurysms.

Aneurysms are a permanent localized dilation or ballooning of an artery wall, at least twice its normal diameter.

Most common site.

Abdominal aorta, right, triple A.

Correct.

Abdominal aortic aneurysm.

Assessment might reveal a pulsating mass in the upper abdomen, maybe slightly left of midline.

You might hear a brute over it.

And the crucial safety point if you suspect a triple A.

Do not palpate the mass.

Avoid pushing on it.

You could cause it to rupture, which is often fatal.

Just report your suspicion.

Okay, don't palpate.

And the most catastrophic event related to the aorta.

That would be aortic dissection.

This isn't just ballooning.

It's a tear in the inner layer, the intima, allowing blood to tunnel into the artery wall itself.

Life -threatening.

What's the classic symptom?

Sudden severe pain, often described as sharp, tearing, or ripping.

It might start in the chest and radiate to the back, neck, or abdomen.

The location might even feel like it's moving as the dissection progresses.

What's the immediate goal if dissection is suspected?

Urgently reduce blood pressure and the force of contraction.

The target systolic is often low, maybe 100 to 120 mm HD.

And pain relief is critical too, as pain can drive the pressure up.

It's about stopping that tear from extending.

Wow, okay, huge priorities there.

Let's switch gears now.

We've covered the arteries, perfusion, inflammation.

Let's look at the venous side in our other core concept.

Clotting, specifically venous thromboembolism, or VTE.

Right.

VTE covers both deep vein thrombosis, DVT, and pulmonary embolism, PE.

If inflammation and damage set the stage for arterial plaque, what sets up a DVT?

It comes down to virtuous triad, doesn't it?

Exactly.

The three contributing factors.

First, stasis of blood flow, blood pooling, not moving well.

Second, endothelial injury damage to the vein lining.

And third, hypercoagulability, the blood itself being more prone to clotting.

DVT is the most frequent type of thrombophlebitis, which is just clot plus inflammation in a vein.

What are the classic signs we look for with a DVT?

Often, it's a sudden onset of swelling in just one leg.

Maybe calf or groin tenderness or pain.

The leg might feel warm, look a bit red.

And what about the Hohmann's sign, that old test?

Ah, yes, pain on dorsiflexing the foot.

The key takeaway now is do not check it.

It's unreliable, not sensitive or specific, and there's a theoretical risk of dislodging the clot, so it's not recommended practice anymore.

Okay, good clarification.

How do we diagnose DVT reliably then?

The preferred test is venous duplex ultrasonography.

It visualizes the vein and blood flow and can directly identify a clot.

What about the D -dimer blood test?

D -dimer is helpful mainly for its negative predictive value.

If the D -dimer is negative, it makes a DVT or PE very unlikely.

But if it's positive, it doesn't confirm a clot.

Lots of things like inflammation, infection, recent surgery can raise D -dimer, so a positive result needs imaging to confirm.

Got it, so management.

Prevention is key, right?

Especially for hospitalized patients.

Absolutely.

Leg exercises,

getting patients up and walking early, early ambulation, using graduated compression stockings, GCS or sequential compression devices, SEDs, staying well hydrated.

And if a DVT is confirmed, what's the immediate nursing action we must not do?

Do not massage the affected leg.

That could break off part of the clot, sending it towards the lungs as a PE.

What should we do?

Elevate the affected leg when the patient is in bed or sitting, use warm compresses for comfort if ordered, and monitor very closely for signs of PE.

That would be sudden chest pain, shortness of breath, maybe coughing, rapid heart rate.

That's an emergency.

Okay.

Anti -coagulation therapy is the mainstay of treatment.

This is a huge safety area.

Let's start with IV heparin, unfractionated heparin, UFH.

Right.

With UFH, we need frequent monitoring, usually with the APTT, activated partial thromboplastin time.

The goal is a therapeutic range, typically about 1 .5 to 2 .5 times the normal control value.

What if the APTT is too high, say over 70 seconds or whatever the lab's critical value is?

You need to notify the provider immediately.

The dose likely needs adjustment, and you need to know the antidote, which is protamine sulfate for heparin.

And another big risk with heparin.

Heparin -induced thrombocytopenia, or HIT.

It's an immune reaction where platelets drop significantly, usually below 150 ,000 or a 50 % drop from baseline.

Paradoxically, it causes more clotting.

You have to monitor platelet counts closely.

Okay, so that's IV heparin.

What about transitioning to oral warfarin?

Warfarin, Coumadin, is monitored with the INR, International Normalized Ratio.

For DVT treatment or prevention, the target INR is usually 2 .0 to 3 .0, though sometimes 1 .5 to 2 .0 for prevention.

And the key safety point about starting warfarin?

It takes several days, usually three to four, maybe even five, to reach a therapeutic INR.

And interestingly, in the first day or two, it can actually temporarily increase clotting risk by depleting certain natural anticoagulants faster than clotting factors.

Which is why you must overlap warfarin therapy with a faster -acting anticoagulant, like heparin or low -molecular -weight heparin, LMWH.

For usually about five days, and until the INR is therapeutic for at least 24 hours, that overlap is critical for safety.

Got it.

Antidote for warfarin?

Vitamin K.

And dietary considerations?

This is huge for patient teaching.

Warfarin works by interfering with vitamin K.

So patients need to maintain a consistent intake of vitamin K -rich foods, things like dark leafy greens, spinach, kale, broccoli.

Not avoid them completely?

No, not necessarily avoid, but keep the intake steady day to day.

Sudden increases or decreases in vitamin K intake will throw off their INR.

Consistency is key.

What about the newer oral anticoagulants, the DOACs?

The direct oral anticoagulants drugs like rivaroxaban, apixaban, davagantrin, they often have fixed dosing, less need for routine lab monitoring like INR or APTT, which is convenient.

But risks?

Bleeding is always a risk with any anticoagulant.

And a key point with DOACs is the danger of stopping them abruptly without medical advice.

Because they have shorter half -lives than warfarin, the anticoagulant effect wears off quickly, potentially leading to a rebound clotting risk.

Adherence is vital.

And specific antidotes are now available for some DOACs, which is important to know.

So regardless of the drug, always teach patients signs of bleeding?

Absolutely.

Any unusual bleeding or bruising, blood in the urine, hematuria or stool,

nosebleeds, petechiae, those little pinpoint red spots, they need to know what to watch for and report.

Okay, great safety points.

Let's wrap up the venous side with chronic issues.

Venous insufficiency, what's happening there?

This is basically the aftermath of prolonged venous hypertension, often due to previous DVTs damaging valves or just incompetent valves.

The veins get stretched out, the valves don't close properly, so blood pools and backs up in the lower legs.

Stasis again.

And this leads to?

Stima, obviously.

Swelling in the lower legs.

And characteristic skin changes called stasis dermatitis.

The skin gets thick, tough, and takes on a reddish -brown discoloration from chronic leakage of blood cells into the tissue.

And ulcers.

Yes, venous stasis ulcers.

These typically occur around the ankle area, especially the inner ankle, medial malleolus.

They tend to have irregular borders and are often quite weepy or exudative due to the edema, different from arterial ulcers, which are often more punched out and dry.

So interventions are focused on fighting that stasis.

Exactly.

Decreasing the edema and promoting venous return back to the heart.

The cornerstone is graduated compression stockings, GCSs.

How should they be used?

Worn daily, every day.

Put them on first thing in the morning before getting out of bed and letting the legs swell and take them off before bed.

Fit is crucial.

And elevation.

Yes.

Unlike PA, here elevation is key.

Elevate the legs above the level of the heart whenever possible, especially when sitting or lying down.

Encourage elevating them for maybe 20 minutes, four or five times a day.

Okay.

And just quickly, varicose veins.

Those are the distended, bulging, torturous, superficial veins.

Management often focuses on the three E's.

Which are?

Elastic compression hose, like GCSs.

Exercise,

like walking to help the calf muscle pump blood and elevation.

Same principles as venous insufficiency, really.

Okay, this has been a really thorough walkthrough.

We've had perfusion, clotting, inflammation, arteries, veins.

Let's try to recap the absolute top priorities you need to take away from this deep dive.

I'd say number one is really nailing the difference in symptoms between chronic arterial disease, think intermittent claudication, pain relieved by dependency versus chronic venous disease, think edema, stasis dermatitis, ulcers near the ankle, relief with elevation.

They present very differently.

Okay, arterial versus venous symptoms.

What's second?

Understanding that underlying thread of inflammation.

It's driving the damage in hypertension.

It's setting up the plaque and atherosclerosis.

It's often present with clots, too.

Managing inflammation is key long -term.

Right.

And third, it has to be anticoagulation safety.

Knowing the drugs heparin, warfarin, DOACs.

Knowing the monitoring APTT for heparin, INR for warfarin.

Knowing the antidotes protamine for heparin, vitamin K for warfarin.

And understanding the why behind the rules, like that critical warfarin -heparin overlap or why we don't do the Hohmann sign anymore.

Those details save lives.

Arterial versus venous signs, inflammation, anticoagulant safety.

Got it.

So let's think about the patient experience for a moment.

Consider the sheer dedication it takes for someone to manage these chronic vascular conditions day in, day out.

Right.

Lifelong compression stockings for venous insufficiency.

Years, decades maybe, of meticulous blood pressure control or diet for atherosclerosis.

It's a huge commitment.

It really is.

And the constant background risk, a clot forming, a plaque rupturing.

The adherence required is immense.

Which brings us to that final thought for you, the listener.

As nurses, the challenge isn't just knowing these facts.

The drugs, the symptoms, the pathophysiology.

The real challenge is translating that knowledge into practice, into patient adherence.

Yeah.

How do we help patients stick with these demanding regimens long term?

It really shifts the nursing role towards being that consistent health coach, that safety net, guiding them through the complexities day after day, year after year.

Something to definitely reflect on as you apply this knowledge.

Absolutely.

We really hope this deep dive helps you feel more confident tackling these crucial vascular concepts.

Thanks for joining us.