Heart Failure — NCLEX Nursing Lesson Anatomy & Physiology · RN Track · Medical-Surgical Body Systems · Cardiovascular System · Heart Failure Condition Lesson · NCLEX-PN / NCLEX-RN

When the pump weakens and fluid backs up—why left failure floods the lungs, right failure swells the body, and the reasoning behind every diuretic, daily weight, and low-sodium meal.

In this lesson

Lesson Objectives
Why This Matters
Disease Overview
Pathophysiology
Risk Factors
Signs & Symptoms
Nursing Assessment
Diagnostic Tests
Laboratory Tests
Medications
Nursing Interventions
Complications
Patient Education
Clinical Judgment
Clinical Connections
NCLEX High-Yield
Memory Aids
Case Study
Practice Questions
Key Takeaways
References

Lesson Objectives

Explain how a failing pump causes fluid to back up—and differentiate left- vs. right-sided heart failure by where it backs up.
Distinguish reduced (HFrEF, systolic) from preserved (HFpEF, diastolic) ejection fraction.
Justify the core treatments—diuretics, ACE/ARB/ARNI, beta-blockers, aldosterone antagonists—and the reasoning behind each.
Prioritize care in acute decompensation/pulmonary edema and teach the self-management that prevents readmission (daily weights, low sodium).
Apply the NCSBN Clinical Judgment model and answer NGN-style items on heart failure.

Why This Matters

Prevalence: heart failure (HF) affects more than 6 million U.S. adults and is a leading cause of hospitalization, especially in older adults. It's a chronic, progressive condition with frequent exacerbations—so these patients cycle through the ED, med-surg, ICU, and home care.

Patient safety: HF means the heart can't pump enough to meet the body's needs, so fluid backs up—into the lungs (left HF) or body (right HF). Acute decompensation (flash pulmonary edema) is a life-threatening emergency, and many readmissions are preventable with good self-care. Fluid and medication management are life-or-death nursing.

NCLEX importance: heavily tested on left vs. right HF signs, daily weights and fluid/sodium management, HF medication classes and safety (diuretics + potassium, ACE cough, beta-blockers, digoxin toxicity), positioning for dyspnea, and recognizing acute pulmonary edema. It builds on the A&P of cardiac output, preload/afterload, and the left-vs-right circulation.

Why nurses encounter it constantly: HF is one of the most common admissions; nurses manage fluid status, titrate/teach medications, prevent readmission, and coach lifelong self-management—daily work across settings.

Connecting to prior lessons From A&P, recall that the left heart pumps to the body and the right heart to the lungs, and that cardiac output depends on preload, afterload, and contractility. From assessment, recall that left HF backs up into the lungs (crackles, dyspnea) and right HF backs up into the body (edema, JVD). HF is those levers failing.

Disease Overview

Heart failure is the inability of the heart to pump enough blood to meet the body's metabolic needs. Two ways to classify it:

Classification	Types & meaning
By side (where fluid backs up)	Left-sided HF → backs up into the lungs (pulmonary congestion). Right-sided HF → backs up into the body (systemic congestion). Left HF is the most common cause of right HF.
By ejection fraction (EF)	HFrEF (systolic, reduced EF): the ventricle can't contract/eject well (weak squeeze; EF ≤40%). HFpEF (diastolic, preserved EF): the ventricle is stiff and can't fill/relax well (EF ≥50%).

Analogy — the backed-up plumbing

Think of the heart as a two-stage pump with pipes on both sides. If the left pump weakens, blood coming from the lungs can't move forward, so it backs up into the lungs—the "pipes" flood and the patient drowns from the inside (crackles, dyspnea). If the right pump weakens, blood coming from the body backs up into the body—so ankles, belly, and neck veins swell (edema, ascites, JVD). Same principle, opposite ends: the fluid backs up behind the failing side.

Pathophysiology

Normal physiology: the heart pumps enough blood (cardiac output) to meet the body's needs, balancing preload, afterload, and contractility. ↓ What goes wrong: an insult (MI/CAD, chronic hypertension, valve disease, cardiomyopathy) weakens the pump or stiffens it → the heart can't eject or fill adequately → cardiac output falls. ↓ Compensation (that eventually hurts): the body tries to help—sympathetic activation (↑ HR/vasoconstriction) and RAAS (retain sodium/water) → these temporarily support BP but increase preload and afterload, making the failing heart work even harder and causing fluid overload. ↓ How symptoms appear: Left HF → blood backs up into the lungs → dyspnea, orthopnea, crackles, cough (pink frothy sputum in acute pulmonary edema). Right HF → blood backs up into the body → peripheral edema, JVD, weight gain, ascites, hepatomegaly. ↓ How it progresses: chronic overload enlarges/remodels the heart → worsening function, low output (fatigue, poor perfusion), and repeated decompensations—including acute pulmonary edema (an emergency) and cardiogenic shock. NCLEX Clinical Pearl — Left = Lungs, Right = Rest of body The single most tested HF concept: LEFT-sided failure backs up into the LUNGS (dyspnea, orthopnea, crackles, cough) and RIGHT-sided failure backs up into the REST of the body (peripheral edema, JVD, weight gain, ascites). Both "L" words go together; "Right = Rest of body."

Risk Factors

Non-modifiable	Modifiable	Preventable / reducible
Age (older) Family history/genetics (cardiomyopathy) Prior MI/heart damage Congenital heart disease	Uncontrolled hypertension (the leading cause) and CAD Diabetes, obesity Excess sodium/fluid, alcohol Nonadherence to meds/diet	Control BP, cholesterol, and diabetes Treat CAD; low-sodium diet, weight/fluid management Smoking/alcohol cessation Adherence and follow-up

High-risk populations: older adults, people with hypertension, CAD/prior MI, diabetes, valve disease, or cardiomyopathy, and those with poor diet/medication adherence. Nonadherence (skipping meds, high-sodium meals) is a top cause of preventable readmissions.

Signs & Symptoms

Type	Findings & WHY they occur
Left-sided HF (pulmonary)	Dyspnea, orthopnea (short of breath lying flat), paroxysmal nocturnal dyspnea (waking gasping), crackles, cough, and fatigue. Blood backs up into the lungs. In acute pulmonary edema: severe dyspnea, pink frothy sputum, anxiety.
Right-sided HF (systemic)	Peripheral (dependent) edema, jugular venous distention (JVD), weight gain, ascites, hepatomegaly, and nausea/anorexia. Blood backs up into the body. Weight gain is an early, sensitive sign of fluid retention.
Low output (both)	Fatigue, weakness, dizziness, cool extremities, decreased urine output, and poor perfusion—the heart can't deliver enough blood.
Early / expected	Exertional dyspnea, fatigue, mild edema, and gradual weight gain—signs of building fluid overload.
Late / unexpected	Worsening dyspnea at rest, marked edema/ascites, an S3 gallop, and signs of poor perfusion.
Emergency findings	Acute pulmonary edema (severe dyspnea, pink frothy sputum, crackles, low SpO₂, anxiety) and cardiogenic shock (hypotension, cool clammy skin, altered mentation)—life-threatening.

Why daily weight is the early-warning system Weight gain from fluid retention shows up before other symptoms—the body holds pounds of water before the lungs flood. A gain of 2–3 lb in a day (or ~5 lb in a week) signals worsening HF and should be reported. Teaching patients to weigh themselves daily (same time, same scale, same clothing) is one of the most powerful ways to prevent readmission.

Nursing Assessment

Subjective: dyspnea (at rest/exertion), orthopnea (how many pillows?), PND, fatigue, weight gain, swelling, cough, diet/sodium/fluid intake, medication adherence, and recent illness/triggers.

Objective: vital signs with SpO₂, daily weight and I&O, lung sounds (crackles), heart sounds (S3), JVD, edema (graded), skin/perfusion, respiratory effort, and mental status.

Priority / focused finding	Why it matters / action
Respiratory status (dyspnea, crackles, SpO₂)	Left HF/pulmonary edema threatens oxygenation—priority; sit upright, oxygen, escalate.
Daily weight & I&O	Weight is the most sensitive marker of fluid status—report a gain of 2–3 lb/day.
Edema, JVD, ascites	Right HF/fluid overload—track and manage.
Perfusion / mental status	Low output/cardiogenic shock—escalate if hypotension, cool/clammy, confusion.
Electrolytes & med effects	Diuretics/HF drugs affect potassium; digoxin toxicity risk—monitor.

When to notify / act now Acute severe dyspnea with pink frothy sputum (pulmonary edema), rapidly falling SpO₂, a rapid weight gain, hypotension with poor perfusion (cardiogenic shock), or signs of digoxin toxicity. These are emergencies.

Diagnostic Tests

Test	Purpose / why ordered	Findings & nursing considerations
Echocardiogram	Measure ejection fraction and assess structure/function	The key test—EF ≤40% = HFrEF; ≥50% = HFpEF. Noninvasive; identifies the type and severity.
Chest X-ray	Detect pulmonary congestion and cardiomegaly	Shows fluid in the lungs and an enlarged heart.
ECG	Detect dysrhythmias, ischemia, or hypertrophy	HF often coexists with AFib and prior MI.
Hemodynamic monitoring (severe cases)	Assess pressures/output in the ICU	Guides therapy in acute decompensation/shock.
Cardiac catheterization (if ischemic cause)	Evaluate coronary disease as a cause	Post-procedure site/pulse monitoring.

Laboratory Tests

Lab	Normal / expected	Significance
BNP (or NT-proBNP)	BNP <100 pg/mL	Elevated with heart failure—the ventricles release it when stretched/overloaded. Higher = worse; trended to track decompensation and response.
Basic metabolic panel — potassium	K⁺ 3.5–5.0 mEq/L	Diuretics (loop/thiazide) lower K⁺; ACE/ARB/aldosterone antagonists raise it—monitor closely (dysrhythmia risk, digoxin toxicity risk with low K⁺).
BUN / creatinine (renal)	BUN 10–20; Cr 0.6–1.2 mg/dL	HF and diuretics affect kidneys; monitor with ACE/ARB and diuresis.
Digoxin level (if on digoxin)	~0.5–2.0 ng/mL (narrow)	Toxicity risk—especially with low potassium. Watch for nausea, visual changes (yellow-green halos), bradycardia.
Sodium	135–145 mEq/L	Dilutional hyponatremia can occur with fluid overload—monitor.

Trend interpretation BNP confirms/tracks HF (rises with overload). Potassium is critical—loop diuretics lower it (and low K⁺ predisposes to digoxin toxicity), while ACE/ARB/spironolactone raise it. Watch renal function with diuresis and ACE/ARB, and sodium for dilutional hyponatremia.

Medications

Diuretics — reduce fluid overload (symptom relief)

Type / drug	Mechanism & key nursing/teaching
Loop — furosemide	Powerful diuresis → relieves pulmonary/peripheral congestion. Loses potassium (monitor K⁺); give in the morning; watch orthostatic hypotension and ototoxicity (rapid high-dose IV).
Thiazide — hydrochlorothiazide	Milder diuresis; also loses potassium.
Aldosterone antagonist — spironolactone	Potassium-sparing; improves survival in HFrEF. Risk of hyperkalemia—avoid extra K⁺/salt substitutes; watch gynecomastia.

Neurohormonal blockers — slow progression / improve survival

Class / drug	Mechanism & key nursing/teaching
ACE inhibitors (-pril) / ARBs (-sartan)	Block RAAS → reduce afterload/preload and remodeling. ACE → dry cough/angioedema (switch to ARB), hyperkalemia, first-dose hypotension; both teratogenic. Monitor K⁺/renal function.
ARNI — sacubitril/valsartan	Newer combination that improves outcomes in HFrEF; do not use with an ACE inhibitor (wait ~36 h after stopping ACE—angioedema risk); watch hyperkalemia/hypotension.
Beta-blockers — carvedilol, metoprolol succinate	Reduce heart rate/workload and improve survival in HFrEF. Start low, go slow; may transiently worsen symptoms early; don't stop abruptly; caution in bradycardia/asthma.
SGLT2 inhibitors — dapagliflozin, empagliflozin	Now used in HF (even without diabetes) to improve outcomes; watch for genital infections/volume effects.

Other / symptom & acute therapy

Drug	Why given & nursing
Digoxin	Positive inotrope (↑ contractility) + slows HR—for symptom control. Narrow therapeutic range; check apical pulse for 1 minute and hold if <60; watch toxicity (nausea, visual halos, dysrhythmias)—worse with low potassium.
Vasodilators (nitrates, hydralazine)	Reduce preload/afterload; useful in some patients.
Acute pulmonary edema (IV)	IV diuretics (furosemide), oxygen, nitrates, and morphine (reduces preload/anxiety) per protocol; positive-pressure ventilation if needed.

Safety — digoxin & potassium Low potassium increases the risk of digoxin toxicity. Since loop diuretics lower potassium and many HF patients take both, monitor K⁺ closely, check the apical pulse before digoxin (hold if <60/min), and teach patients to report nausea, vomiting, and yellow-green visual halos. NCLEX testing points Diuretics relieve congestion (loop = lose K⁺; spironolactone = keep K⁺). ACE/ARB/ARNI + beta-blockers + aldosterone antagonists + SGLT2i improve survival (guideline therapy). Digoxin: apical pulse 1 min, hold if <60; toxicity worse with low K⁺. Don't stop beta-blockers abruptly. Watch K⁺, BNP, and renal function.

Nursing Interventions

Priority	Intervention & WHY
Airway/Breathing	Sit the patient upright (high Fowler's), give oxygen, and monitor SpO₂—upright positioning eases breathing and reduces venous return to the flooded lungs. In pulmonary edema, escalate quickly.
Circulation / fluid management	Give diuretics and monitor response (I&O, daily weight, edema, lung sounds); manage preload/afterload with HF meds; monitor for low output/shock.
Monitor fluid status	Daily weight (same time/scale/clothing), strict I&O, sodium/fluid restriction as ordered—weight is the early warning of overload.
Reduce cardiac workload	Rest with activity as tolerated, calm environment, and treat anxiety—less demand on a failing pump.
Medication safety	Monitor potassium/renal function; check apical pulse before digoxin; don't stop beta-blockers abruptly; watch for orthostatic hypotension.
Safety	Fall precautions (weakness/orthostasis), skin care over edematous areas, and DVT prevention.
Comfort & nutrition	Position for comfort, small frequent low-sodium meals, and energy conservation.
Patient education	Daily weights, low-sodium diet, fluid limits, medication adherence, and warning signs—the keys to preventing readmission.
Interdisciplinary	Cardiology, dietitian (low sodium), pharmacy, cardiac rehab, and home health/case management.

Why upright positioning + diuretics work so well Sitting upright (legs down) reduces venous return (preload) to the overloaded heart and lets the lungs expand—so breathing eases immediately. Diuretics then remove the excess fluid. Together they attack the core problem (too much fluid the pump can't handle), which is why they're first-line in acute HF.

Potential Complications

Complication	Early signs	Nursing / emergency response
Acute pulmonary edema	Severe dyspnea, pink frothy sputum, crackles, low SpO₂, anxiety	Emergency: high Fowler's, oxygen, IV diuretics/nitrates/morphine per protocol, notify provider; prepare for ventilation.
Cardiogenic shock	Hypotension, cool clammy skin, altered mentation, low output	Emergency: oxygen, inotropes/vasopressors, possible mechanical support; ICU.
Dysrhythmias (e.g., AFib)	Irregular rhythm, palpitations, worsening symptoms	Monitor, correct electrolytes, treat per protocol; anticoagulation for AFib.
Digoxin toxicity	Nausea/vomiting, visual halos, bradycardia, dysrhythmias	Hold drug, check level/potassium, notify provider; anticipate digoxin-immune Fab if severe.
Electrolyte imbalance	Abnormal K⁺/Na⁺, muscle/cardiac effects	Monitor and replace/adjust; prevents dangerous dysrhythmias.
Renal impairment	Rising creatinine, decreased urine	Monitor with diuretics/ACE-ARB; balance fluid removal and perfusion.

Patient Education

Disease process: explain that HF is a chronic condition where the heart can't keep up, so fluid builds up—and that self-care controls it. Lifestyle modifications: follow a low-sodium diet (sodium holds water) and any fluid restriction, limit alcohol, stay active as tolerated (cardiac rehab), and stop smoking. Daily weights: weigh every morning (same time, scale, clothing) and report a gain of 2–3 lb in a day or ~5 lb in a week—the earliest sign of fluid retention. Medication adherence: take all HF medications as prescribed (they improve survival), never stop beta-blockers abruptly, understand diuretic timing (morning) and potassium precautions, and know digoxin safety (report nausea, visual halos, slow pulse). Home care: monitor for swelling/dyspnea, elevate legs, and pace activity. Follow-up: keep appointments and labs (potassium, renal function). Warning signs / when to seek emergency care: rapid weight gain, worsening shortness of breath or swelling, waking gasping for air, pink frothy sputum, or fainting—seek care.

Clinical Judgment (NCSBN Model)

Recognize cues: a patient with HF is admitted with increasing shortness of breath, orthopnea (sleeping in a recliner), a 6-lb weight gain over 4 days, bilateral crackles, 3+ pedal edema, JVD, and an SpO₂ of 90%. He admits he "had a lot of salty food and skipped his water pill."
Analyze cues: dyspnea/orthopnea + crackles + weight gain + edema + JVD = acute decompensated heart failure (fluid overload), triggered by dietary sodium and a missed diuretic. Oxygenation and fluid removal are the concerns.
Prioritize hypotheses: acute HF exacerbation with impaired oxygenation and fluid overload—airway/oxygenation and diuresis are the priority.
Generate solutions: sit him upright (high Fowler's), apply oxygen, give the ordered IV diuretic, monitor daily weight/I&O, lung sounds, SpO₂, and potassium; notify the provider; plan sodium/fluid restriction and adherence teaching.
Take action: position and oxygenate, administer diuretics, monitor fluid status and electrolytes, and reduce workload.
Evaluate outcomes: is dyspnea improving, SpO₂ rising, weight/edema decreasing, and urine output adequate? Reinforce daily weights, low-sodium diet, and medication adherence to prevent the next admission.

Clinical Connections — commonly confused conditions

	Left-sided HF	Right-sided HF
Where fluid backs up	Into the lungs	Into the body (systemic)
Hallmark signs	Dyspnea, orthopnea, PND, crackles, cough (pink frothy sputum if acute)	Peripheral edema, JVD, weight gain, ascites, hepatomegaly
Common cause	Hypertension, CAD/MI	Often left HF; also lung disease (cor pulmonale)
Priority nursing	Oxygenation, upright position, diuresis	Fluid/edema management, daily weight

	HFrEF (systolic)	HFpEF (diastolic)
Problem	Weak contraction (can't eject)	Stiff ventricle (can't fill/relax)
Ejection fraction	≤40%	≥50% (preserved)
Treatment	Guideline drugs (ACE/ARB/ARNI, beta-blockers, aldosterone antagonists, SGLT2i, diuretics)	Control BP/rate, manage volume; treat underlying causes

Also distinguish HF's pulmonary edema (cardiac; crackles, pink frothy sputum) from other dyspnea causes (COPD, pneumonia, PE), and remember chronic HF can acutely decompensate—often from sodium/fluid excess or missed meds.

NCLEX High-Yield Review

What the NCLEX Wants You to Know

Left = Lungs; Right = Rest of body The core HF distinction.
Daily weight is the early warning Report a gain of 2–3 lb/day (~5 lb/week).
Sit upright + oxygen + diuretics for pulmonary edema Reduce preload, remove fluid.
Digoxin: apical pulse 1 min, hold if <60 Low K⁺ → toxicity.
Low sodium + adherence prevents readmission

Common distractors: giving digoxin without checking the apical pulse, stopping beta-blockers abruptly, encouraging high-sodium foods/extra fluids, laying a dyspneic HF patient flat, and ignoring a rapid weight gain. Priority interventions: oxygenation/upright position, diuresis, daily weight/I&O, medication safety, and adherence teaching. Expected vs unexpected: gradual exertional dyspnea/mild edema is expected in chronic HF; acute severe dyspnea/pink frothy sputum, rapid weight gain, or hypotension with poor perfusion are emergencies. Patient teaching: daily weights, low sodium, fluid limits, adherence, warning signs. Safety: potassium/digoxin, orthostatic falls, fluid balance. Delegation: RN assesses lung/heart sounds, interprets, and manages emergencies; UAP can obtain daily weights, I&O, and vitals and report—but not interpret or give meds. Frequently tested meds: furosemide, spironolactone, lisinopril/losartan/ARNI, carvedilol/metoprolol, digoxin, SGLT2i. Critical values: potassium, BNP, digoxin level. Most common mistakes: not checking apical pulse before digoxin, missing rapid weight gain, and high-sodium teaching errors.

Memory Aids

"Left = Lungs; Right = Rest of body" — where fluid backs up.
Right HF signs "SWELLING" — Swelling/edema, Weight gain, Enlarged organs (hepatomegaly/ascites), Lots of JVD.
Acute pulmonary edema "LMNOP" — Lasix (furosemide), Morphine, Nitrates, Oxygen, Position upright (and Positive pressure).
Daily weight "2–3 in a day, call right away" — report a 2–3 lb daily gain.
Digoxin "Check the apical, hold under 60" — toxicity worse with low potassium.
Diuretics "Loops Lose K, Spironolactone Saves K."
BNP = "Been Notified of Pump-failure" — rises in heart failure.

Case Study — from admission to discharge

Admission. Mrs. Ito, 76, with HFrEF (EF 30%), comes to the ED with worsening shortness of breath, now sleeping upright in a chair, a 7-lb weight gain over 5 days, and swollen ankles. She says she "went to a big family dinner with lots of salty food" and "ran out of my water pill." Exam: RR 26, SpO₂ 88%, bibasilar crackles, 3+ pedal edema, JVD, an S3 gallop. BNP is markedly elevated; potassium 3.3.

Step 1–2: Recognize & analyze cues

Cues: dyspnea/orthopnea + weight gain + crackles + edema + JVD + S3 + high BNP = acute decompensated heart failure (fluid overload), triggered by dietary sodium and a missed diuretic. Hypoxia (SpO₂ 88%) and hypokalemia add risk.

Step 3–4: Prioritize & plan

Priority: airway/oxygenation and fluid removal. Plan: high Fowler's, oxygen, IV furosemide, monitor daily weight/I&O, lung sounds, SpO₂, and potassium (replace as ordered); continue guideline HF meds; sodium/fluid restriction; notify the provider.

Step 5: Take action

The nurse sits her upright, applies oxygen (SpO₂ rises to 93%), gives IV furosemide (with a Foley/urinal for accurate output), replaces potassium, monitors weight/edema/lung sounds, and reduces her workload with rest and a calm environment.

Step 6: Evaluate & discharge

Her dyspnea eases, SpO₂ improves, weight and edema decrease with diuresis, and potassium normalizes. Discharge teaching: weigh daily and report a 2–3 lb gain, follow a low-sodium diet and fluid limits, take all HF medications every day (never stop the beta-blocker abruptly; take the diuretic in the morning; potassium precautions), attend cardiac rehab/follow-up, and seek care for worsening dyspnea, rapid weight gain, or waking gasping for air.

NCLEX Practice Questions

Answer choices are numbered; the correct answer is given as a number.

1. Which findings are most characteristic of left-sided heart failure?

Peripheral edema and jugular venous distention
Ascites and hepatomegaly
Dyspnea, orthopnea, and crackles
Weight gain only

Rationale

Answer: 3. Left-sided HF backs fluid into the lungs, causing dyspnea, orthopnea, and crackles. Peripheral edema/JVD (1), ascites/hepatomegaly (2), and systemic weight gain (4) are right-sided (systemic) findings.

2. A nurse is teaching a client with heart failure about self-monitoring. Which instruction is most important?

Weigh yourself daily and report a gain of 2–3 lb in a day
Restrict all physical activity permanently
Increase sodium intake to maintain energy
Drink extra fluids to stay hydrated

Rationale

Answer: 1. Daily weights detect fluid retention early—report a gain of 2–3 lb/day (~5 lb/week). Restricting all activity (2), increasing sodium (3), and drinking extra fluids (4) worsen HF.

3. Before administering digoxin to a client with heart failure, the nurse should first:

Check the client's temperature
Give it with an antacid
Administer it only at bedtime
Count the apical pulse for one full minute and hold if it is below 60

Rationale

Answer: 4. Digoxin slows the heart rate, so count the apical pulse for a full minute and hold if <60 (per parameters), then notify the provider. The other actions are not the required safety check.

4. A client with acute pulmonary edema is severely short of breath. What is the nurse's priority action?

Lay the client flat to rest
Sit the client upright (high Fowler's) and apply oxygen
Encourage oral fluids
Restrict the client to bed rest without repositioning

Rationale

Answer: 2. Sitting upright reduces venous return (preload) and eases breathing, and oxygen supports oxygenation—the priority in pulmonary edema, along with IV diuretics per protocol. Lying flat (1, 4) worsens dyspnea, and oral fluids (3) add to overload.

5. A client with heart failure on furosemide has a potassium level of 3.1 mEq/L and takes digoxin. The nurse recognizes this places the client at risk for:

Digoxin toxicity
Improved cardiac output
Hypertension
Fluid overload

Rationale

Answer: 1. Low potassium increases the risk of digoxin toxicity. Loop diuretics lower potassium, so monitor K⁺ closely and replace it. The other options don't result from hypokalemia with digoxin.

6. SATA. Which findings indicate worsening heart failure requiring provider notification? Select all that apply.

A weight gain of 4 lb in two days
Increasing shortness of breath and orthopnea
New or worsening crackles
Stable weight and clear lungs
Pink frothy sputum

Rationale

Answers: 1, 2, 3, 5. Rapid weight gain, worsening dyspnea/orthopnea, new crackles, and pink frothy sputum indicate decompensation. Stable weight with clear lungs (4) is a reassuring, expected finding.

7. SATA. Which teaching points are appropriate for a client with heart failure? Select all that apply.

Follow a low-sodium diet
Take heart-failure medications every day as prescribed
Stop the beta-blocker as soon as symptoms improve
Weigh yourself daily at the same time
Report increased swelling or shortness of breath

Rationale

Answers: 1, 2, 4, 5. Low sodium, daily adherence, daily weights, and reporting worsening symptoms are core HF self-care. Stopping the beta-blocker abruptly (3) causes rebound effects and worsens outcomes.

8. Priority. A nurse is caring for four clients. Who should be assessed first?

A client with stable chronic HF requesting diet teaching
A client with mild ankle edema asking to elevate the legs
A client with severe dyspnea and pink frothy sputum
A client with HF awaiting routine discharge

Rationale

Answer: 3. Severe dyspnea with pink frothy sputum indicates acute pulmonary edema—a life-threatening emergency and the priority. The others are stable or routine.

9. Delegation. Which task can the RN appropriately delegate to unlicensed assistive personnel (UAP) for a stable client with heart failure?

Interpreting lung sounds
Obtaining the daily weight and recording intake and output, reporting the values
Teaching about a low-sodium diet
Administering IV furosemide

Rationale

Answer: 2. Daily weights and I&O are within UAP scope and support fluid monitoring. Interpreting lung sounds (1), teaching (3), and giving IV medications (4) require the licensed nurse.

10. NGN Case Study. A 70-year-old with HFrEF is admitted with a 6-lb weight gain over 4 days, worsening dyspnea, orthopnea, bibasilar crackles, 3+ pedal edema, and JVD. Vitals: RR 28, SpO₂ 89%. He reports eating "a lot of canned soup" and skipping his diuretic. Potassium is 3.2; BNP is markedly elevated.

a) What is happening and which cues support it?
b) What are the priority nursing actions and key teaching?

Model answer

a) What's happening: acute decompensated heart failure (fluid overload), triggered by high dietary sodium and a missed diuretic. Supporting cues: rapid weight gain, dyspnea/orthopnea, crackles, edema, JVD, hypoxia (SpO₂ 89%), and elevated BNP.

b) Priority actions/teaching: 1) airway/oxygenation—sit upright (high Fowler's) and apply oxygen; 2) give the ordered IV diuretic (furosemide) and monitor daily weight, I&O, lung sounds, and SpO₂; 3) monitor and replace potassium (3.2, especially if on digoxin—toxicity risk); 4) restrict sodium/fluids and continue guideline HF meds; 5) notify the provider. Key teaching: daily weights (report a 2–3 lb/day gain), a low-sodium diet, fluid limits, and daily medication adherence to prevent readmission. Evaluate improved dyspnea, oxygenation, and weight/edema reduction.

Key Takeaways

Heart failure = a failing pump → fluid backs up. Left = Lungs (dyspnea, orthopnea, crackles); Right = Rest of body (edema, JVD, weight gain, ascites).
HFrEF (EF ≤40%, weak squeeze) vs. HFpEF (EF ≥50%, stiff/can't fill).
Daily weight is the early-warning system—report a gain of 2–3 lb/day (~5 lb/week).
Acute pulmonary edema: sit upright, oxygen, IV diuretics (LMNOP)—reduce preload and remove fluid.
Medications: diuretics relieve congestion (loop = lose K⁺; spironolactone = keep K⁺); ACE/ARB/ARNI + beta-blockers + aldosterone antagonists + SGLT2i improve survival. Digoxin: apical pulse 1 min, hold if <60; toxicity worse with low K⁺.
Watch potassium, BNP, and renal function; never stop beta-blockers abruptly.
Prevent readmission with low sodium, fluid limits, daily weights, and adherence—self-care is the treatment.

References

Hinkle, J. L., Cheever, K. H., & Overbaugh, K. J. (2022). Brunner & Suddarth's textbook of medical-surgical nursing (15th ed.). Wolters Kluwer/Lippincott.
Ignatavicius, D. D., Workman, M. L., Rebar, C. R., & Heimgartner, N. M. (2021). Medical-surgical nursing: Concepts for interprofessional collaborative care (10th ed.). Elsevier.
Silvestri, L. A., & Silvestri, A. E. (2023). Saunders comprehensive review for the NCLEX-RN examination (9th ed.). Elsevier.
Assessment Technologies Institute. (2023). ATI RN adult medical-surgical nursing review module (12th ed.). ATI Nursing Education.
Heidenreich, P. A., Bozkurt, B., Aguilar, D., Allen, L. A., Byun, J. J., Colvin, M. M., … Yancy, C. W. (2022). 2022 AHA/ACC/HFSA guideline for the management of heart failure. Circulation, 145(18), e895–e1032. https://doi.org/10.1161/CIR.0000000000001063
American Heart Association. (2024). Heart failure: Types, symptoms, and management. https://www.heart.org
Centers for Disease Control and Prevention. (2024). Heart failure. U.S. Department of Health and Human Services. https://www.cdc.gov/heartdisease

Heart Failure

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Welcome & Getting Started

Launch RN Simulator

Wellness Center

Nursing Foundations

Fundamentals & Safety

Pharmacology

Dosage Calculations

Leadership, Management & Delegation

Medical-Surgical Body Systems

Neurological System

Sensory System

Endocrine System

Respiratory System

Cardiovascular System

Hematologic/Immune/Lymphatic System

Gastrointestinal (GI) System

Renal & Genitourinary

Reproductive System

Musculoskeletal System

Integumentary System

Specialty Areas

Maternity

Infectious Diseases

Pediatrics

Mental Health

NCLEX Success Center

Clinical Judgment Practice

Prioritization Practice

Delegation Practice

Lab Values

Final Review