❤️ New Lesson 13

Cardiovascular Basics

Perfusion, heart failure, chest pain, shock, rhythms, blood pressure, and core cardiac meds.

Overview

Perfusion first: ask whether blood is moving forward

Cardiovascular questions are usually really asking one thing: is the brain, heart, kidneys, and skin getting enough oxygen-rich blood? If perfusion drops, the patient gets cool, clammy, restless, hypotensive, weak, and confused.

Core Idea	What to Remember	Common NCLEX Clue
Cardiac Output	CO = HR × SV	Low CO = low BP, weak pulses, decreased urine output
Preload	How much volume stretches the heart before it squeezes	Fluid overload, JVD, edema, crackles
Afterload	How hard the heart has to push against resistance	Hypertension makes the heart work harder
Perfusion	Blood getting where it needs to go	Mental-status change is an early red flag

Left-Sided Heart Failure	Right-Sided Heart Failure
BACKS UP into the LUNGS	BACKS UP into the BODY
Crackles, dyspnea, orthopnea, pink frothy sputum	JVD, edema, hepatomegaly, weight gain, ascites
Think: trouble breathing	Think: swelling everywhere

✅

Chest pain rule: pain not relieved by rest, nitro, or time is never something to ignore. Get vitals, oxygen if hypoxic, ECG, and rapid help.

⚠️

Digoxin rule: hold and reassess if apical pulse is below 60 unless the prescriber specifically says otherwise.

🚨

Shock clue: cold/clammy + confused + low urine output = perfusion emergency until proven otherwise.

Must-Know Disorders

Condition	Classic Clues	Priority Nursing Focus
Hypertension	Often silent, may cause headache or blurred vision when severe	Trend BP, assess headache/neuro changes, teach long-term control
Stable Angina	Pain with activity, better with rest or nitro	Stop activity, assess pain, nitro if ordered, evaluate pattern
Myocardial Infarction	Crushing/pressure pain, diaphoresis, nausea, not relieved by rest	Rapid ECG, cardiac enzymes, aspirin if ordered, oxygen if low sat
Heart Failure	Crackles or edema, weight gain, fatigue, shortness of breath	Daily weights, I&O, lung sounds, med response, low-sodium teaching
Atrial Fibrillation	Irregularly irregular pulse, may throw clots	Rate control, anticoagulation safety, stroke assessment
Cardiogenic Shock	Bad pump + low BP + cool skin + weak pulses	Stay with patient, support oxygenation, monitor perfusion closely

🫀 Chest Pain Priorities

Assess • ECG • IV access • meds per orders • trend perfusion

Nitroglycerin can drop blood pressure. Always look at BP first. Oxygen is helpful when the patient is actually hypoxic or in obvious respiratory distress.

When heart failure worsens

Look for sudden weight gain, crackles, new shortness of breath, trouble lying flat, and edema. These clues usually matter more than a single isolated vital sign.

When rhythms become dangerous

Any rhythm issue with low BP, chest pain, altered mental status, or severe shortness of breath is not just a tracing problem — it is a perfusion problem.

Exam shortcut: left heart failure = lung symptoms, right heart failure = body swelling. If the question keeps talking about crackles and orthopnea, think left-sided failure first.

Cardiac Med Links

Medication classes make cardio easier

Students often try to memorize random drug names. A better strategy is to memorize the pattern of the class, then attach each drug to the same nursing checks.

❤️ Cardiac Glycoside

Digoxin

Used for heart failure and some atrial fibrillation situations.

Check apical pulse for 1 full minute
Low potassium makes toxicity more likely
Toxicity clues: nausea, vomiting, visual halos, bradycardia

Open Drug ToxicitiesOpen Pharm by Class

🧱 Rate Control

Beta Blockers

Usually end in -olol and slow the heart down.

Check HR and BP before giving
Can cause bradycardia and hypotension
Use caution in asthma/COPD because some can worsen bronchospasm

Respiratory crossoverPriority crossover

🩺 BP / HF

ACE Inhibitors & ARBs

Common for hypertension, heart failure, and kidney protection.

Watch for hypotension after first doses
ACE inhibitors can cause dry cough
Monitor potassium and kidney function

See Lab ValuesLinked notes

💧 Fluid Off-loader

Loop Diuretics

Classic drug class for pulmonary edema and fluid overload.

Daily weights beat guessing
Watch potassium, blood pressure, urine output
Improvement should reduce crackles and edema

Pulmonary edema linkAcid-base link

🫧 Vasodilator

Nitrates

Used for angina and sometimes acute chest-pain relief.

Check BP first
Headache is common
Teach patients to sit before taking because dizziness can happen fast

Unstable chest painClass notes

🩸 Clot Prevention

Antiplatelets & Anticoagulants

Used after MI, with atrial fibrillation, and for clot prevention.

Look for bleeding gums, bruising, black stools
Warfarin needs INR follow-up
Heparin uses aPTT monitoring

Coagulation labsSafety notes

📖 Notes for Dummies

🧠 Think of the heart like a house pump

The heart is a pump pushing blood through pipes. If the pump gets weak, fluid backs up. If the pipes get tight, pressure rises. If the rhythm gets messy, blood does not move smoothly. That is why cardiac questions are usually about perfusion, not just memorizing fancy words.

🏠

Left side = lungs. When the left side fails, fluid backs into the lungs. That is why you hear crackles and the patient cannot breathe flat.

🦵

Right side = body. When the right side fails, the blood backs up in the body. That is why you see ankle swelling, belly swelling, and neck-vein distention.

💊

Medication shortcut: if a cardiac med slows the heart or lowers BP, check the pulse and blood pressure before giving it.

📝 Simple memory picture:
Weak pump → less forward blood flow → tired brain, tired kidneys, tired skin.
Fluid backing into lungs → crackles and shortness of breath.
Fluid backing into body → edema and weight gain.