Heart Failure

Heart Failure – CEN Emergency Nursing Review 🏥🫀

Heart failure is one of the most common, high-risk ED presentations. It can look like “just shortness of breath,”
but it can rapidly become respiratory failure, cardiogenic shock, or a dysrhythmia-driven arrest.
For the CEN exam, success is about recognizing patterns fast, prioritizing the right interventions, and avoiding classic traps. 🚑⚡

Fast Jump 🧭

Why this matters •
Anatomy •
Physiology •
Pathophysiology •
ED presentation •
CEN pearls •
Assessment •
Interventions •
Diagnostics •
Complications •
Exam traps •
Rapid review

Why ED nurses must recognize heart failure FAST 🚨

• Heart failure can deteriorate into flash pulmonary edema → hypoxia → respiratory failure. 🫁📉
• It can be driven by reversible triggers (ACS, dysrhythmias, hypertension, infection, noncompliance). Finding the cause changes everything. 🎯
• Missed HF can be mistaken for COPD/asthma, pneumonia, or PE → delays in diuresis/vasodilation/ventilation support. 🧠
• Bad outcomes include need for intubation, cardiogenic shock, renal failure, and death. ⚠️
• In triage it often presents as: “SOB,” “can’t lie flat,” “swelling,” “weight gain,” “cough,” “fatigue”. 🧾

The ED nurse mindset 🧠

• First question: Is the patient oxygenating and ventilating? (work of breathing matters). 🫁
• Second question: Warm & wet vs cold & wet? (perfusion + congestion). 🩸
• Third question: What is the trigger? (ACS, AF RVR, HTN crisis, infection, meds/diet). 🎯

Structures you must “see” in your head 🫀

• Left ventricle (LV): main pump to body; LV failure → pulmonary congestion/edema. 🫁
• Right ventricle (RV): pumps to lungs; RV failure → systemic congestion (JVD, edema, hepatomegaly). ⬆️🦶
• Valves (mitral/aortic/tricuspid): regurg/stenosis increases workload and worsens HF. 🚪
• Pulmonary capillaries: fluid backs up here → crackles, hypoxia, pink frothy sputum (severe). 💧
• Kidneys: perfusion + RAAS activation drives sodium/water retention → more volume overload. 🫘

What should normally be happening 🧠➡️🫀➡️🩸

• Cardiac output (CO) = heart rate × stroke volume. Enough CO = good perfusion and organ function. 🩸
• Preload = ventricular filling/volume coming in. Too much preload can flood the lungs when the LV is weak. 💧
• Afterload = resistance the heart pumps against (SVR/BP). High afterload (HTN) can trigger flash pulmonary edema. 📈
• Ejection fraction (EF) reflects systolic pumping (HFrEF). Some patients have preserved EF but stiff ventricles (HFpEF). 🫀
• RAAS/SNS help short-term (vasoconstriction + fluid retention) but worsen HF long-term. ⚡🧂

Step-by-step: what goes wrong in heart failure 🧠✅

1. Trigger hits (common ED triggers): ACS/MI, uncontrolled HTN, AF RVR, infection/sepsis, PE, anemia, missed meds, high-salt diet, renal failure, toxins. 🎯
2. Pump failure or filling failure:
   • HFrEF: weak squeeze → low EF → poor forward flow. 🫀
   • HFpEF: stiff LV → high filling pressures even with “normal EF.” 🧱
3. Back-up pressure builds behind the failing side:
   • LV failure → pulmonary venous congestion → alveolar fluid → crackles/hypoxia. 🫁💧
   • RV failure → systemic venous congestion → JVD, edema, ascites. ⬆️🦶
4. Neurohormonal compensation (SNS/RAAS) causes vasoconstriction + fluid retention → temporarily supports BP but worsens congestion. ⚡🧂
5. Decompensation leads to: respiratory distress, dysrhythmias, renal dysfunction, shock. 🚑📉

What you see in triage + primary survey 🏥

• Chief complaints: SOB, orthopnea (can’t lie flat), PND (wakes up gasping), edema, weight gain, fatigue, cough. 🫁🛏️
• Appearance: anxious, tripod, speaking in short phrases, diaphoretic (severe). 😮‍💨
• Lung sounds: crackles/rales, sometimes wheezes (“cardiac asthma”). 🫁
• Vitals patterns: tachypnea, tachycardia; may be hypertensive (flash edema) or hypotensive (shock). 📈📉
• Other clues: JVD, S3 gallop, peripheral edema, cool/clammy extremities if low perfusion. ⬆️🦶❄️

Recognize these testable patterns ✅

• Orthopnea + PND are highly suggestive of HF congestion. 🛏️🫁
• S3 gallop = volume overload / decreased ventricular compliance (classic HF finding). 🎧
• BNP/NT-proBNP supports HF (not perfect; interpret with clinical picture). 🧪
• CXR clues: vascular congestion, interstitial edema, cardiomegaly, pleural effusions. 🩻
• POCUS clues: B-lines (pulmonary edema), plethoric IVC, reduced EF (operator dependent). 🔬
• Cold & wet (poor perfusion + congestion) = higher risk; may need ICU-level care. ❄️💧
• AF RVR can cause decompensation; rate control + treating congestion may be key. ⚡
• Hypertensive HF often needs vasodilation + noninvasive ventilation early. 📈🫁

What to assess (history + exam + red flags) 🧾

Key history questions 🎯

• Known HF? Last EF? Recent admissions? Baseline weight and oxygen use? 🫀
• Medication adherence (diuretics!), missed doses, recent diet/“salty foods,” fluid intake. 💊🧂
• Chest pain/pressure (ACS), palpitations (AF RVR), fever/cough (infection). 🧠
• Rapid onset vs gradual (flash edema vs slow volume overload). ⏱️
• Renal disease/dialysis schedule missed? 🫘

Focused physical exam 🩺

• Work of breathing: accessory muscles, ability to speak, mental status changes. 🫁
• Lungs: crackles, wheeze, diminished bases (effusions). 🫁
• Perfusion: cool/clammy, cap refill, mentation, urine output trend. 🩸
• JVD, edema, hepatomegaly; look for sacral edema in bedbound patients. ⬆️🦶

ED priorities (what you do first + why) 🏥

Airway/Breathing support 🫁

• Noninvasive ventilation (CPAP/BiPAP) early for moderate–severe distress/edema (per protocol). Rationale: recruits alveoli, improves oxygenation, reduces preload/afterload. 🫁✅
• Prepare for intubation if failing NIV, exhausted, or altered. Rationale: respiratory fatigue can lead to arrest. ⚠️

Circulation & hemodynamics 🩸

• Hypertensive acute HF / flash edema: anticipate vasodilators per provider (e.g., nitrates) + NIV. Rationale: reduce afterload, improve forward flow quickly. 📈➡️📉
• Volume overloaded (“wet”): anticipate IV diuretics per provider; monitor urine output. Rationale: removes excess fluid and improves pulmonary congestion. 🚽💧
• Hypotensive / cold & wet: cautious fluids only if truly dry; prepare pressors/inotropes per provider and ICU escalation. Rationale: diuresis/vasodilation can worsen shock if perfusion is failing. 📉🚨

Monitoring & nursing workflow ✅

• Strict I&O; consider external catheter; daily weights if admitted. 🧾
• Frequent lung reassessment after NIV/diuretics/vasodilators. 🫁
• Watch electrolytes (K/Mg) and rhythm changes with diuresis. ⚡🧪
• Treat the trigger: ACS pathway, infection workup, AF RVR management, BP control. 🎯

What to order/expect (and what it tells you) 🧪

• EKG: ischemia, AF RVR, conduction blocks, LVH strain. ⚡
• CXR: cardiomegaly, pulmonary vascular congestion, interstitial/alveolar edema, pleural effusions. 🩻
• BNP/NT-proBNP: supports HF; interpret with age/renal function/obesity. 🧪
• Troponin: assesses for ACS/demand ischemia (common trigger). 🧪
• CBC/CMP: anemia, infection, renal function (diuretic dosing/risks), electrolytes. 🧫🫘
• ABG/VBG (if severe): ventilation status, CO2 retention, acid-base; look for impending fatigue. 🫁
• POCUS: B-lines, IVC size/collapsibility, EF estimate, pleural effusions. 🔬
• Echo (often inpatient/urgent): EF, valve function, wall motion. 🫀

What can go wrong if HF worsens 🚨

• Respiratory failure (worsening pulmonary edema) → intubation. 🫁⚠️
• Cardiogenic shock → hypotension, cool extremities, AMS, low urine output. 📉🧠
• Malignant dysrhythmias (VT/VF), bradyarrhythmias, sudden cardiac death. ⚡
• Renal failure (cardiorenal syndrome). 🫘
• Myocardial ischemia from demand or ACS trigger. 🫀

Avoid these common exam mistakes 🎯

• Trap: Treating HF wheeze like asthma with aggressive fluids and repeated bronchodilators only.
  Fix: Consider “cardiac asthma” — look for edema, JVD, BNP/CXR clues; support ventilation and manage congestion. 🫁
• Trap: Large IV fluid bolus for tachycardia without assessing volume status.
  Fix: HF patients are often “wet”; reassess lungs/IVC/perfusion before fluids. 💧
• Trap: Delaying NIV until after meds “kick in.”
  Fix: Early CPAP/BiPAP can rapidly improve oxygenation and reduce work of breathing. ✅
• Trap: Missing the trigger (ACS, AF RVR, HTN crisis, infection).
  Fix: HF is often the result — treat the cause while treating symptoms. 🎯
• Trap: Over-diuresis/vasodilation in hypotensive “cold & wet” patients.
  Fix: This group may need pressors/inotropes and ICU escalation. 📉🚨

One-minute HF recap 🏥✅

• Think HF with SOB + orthopnea/PND + crackles + edema/JVD. 🫁⬆️
• First priorities: sit up, O2, monitor, IV, EKG, assess WOB + perfusion. 🪑🫁⚡
• Early NIV for distress/edema = high yield in ED care. ✅
• Hypertensive flash edema often needs vasodilation + NIV fast. 📈➡️📉
• Diuretics help volume overload; monitor K/Mg + urine output. 💧🧪
• Cold & wet (shock + congestion) = high risk → escalate to ICU, pressors/inotropes per provider. 📉🚨
• Always search for the trigger: ACS, AF RVR, infection, HTN crisis, renal failure, nonadherence. 🎯

Study tip 🧠: On CEN questions, decide if the patient is oxygenating, congested (wet), and/or poorly perfused (cold). Then choose the priority action that fixes the biggest immediate threat: NIV for distress, vasodilation for hypertensive flash edema, or shock management + escalation for cold & wet. 🏥✅

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