Residency · Residency · Emergency Medicine
Acute Heart Failure in the ED
Pathophysiology
Heart Failure Phenotypes
Acute heart failure presentations can be categorized by two axes — congestion (wet versus dry) and perfusion (warm versus cold) — yielding four hemodynamic profiles. The wet-warm phenotype, with volume overload but adequate perfusion, is the most common ED presentation; congestion is the dominant problem. Wet-cold describes volume overload with poor perfusion — this is cardiogenic shock. Dry-warm represents compensated heart failure with chronic symptoms. Dry-cold, with low output and no congestion, is rare and difficult to manage.
| Profile | Congestion | Perfusion | Prevalence | Initial ED Approach |
|---|---|---|---|---|
| Warm-Wet | Yes | Adequate | Most common | Vasodilators, diuretics, NIPPV |
| Cold-Wet | Yes | Poor | Cardiogenic shock | Vasopressors, inotropes, cautious diuresis |
| Warm-Dry | No | Adequate | Compensated | Adjust outpatient medications |
| Cold-Dry | No | Poor | Rare | Volume challenge, inotropes |
Acute Decompensation Mechanisms
Decompensation can be triggered by fluid overload from dietary indiscretion, medication non-compliance, or acute kidney injury. An acute increase in afterload, as in a hypertensive emergency, can precipitate failure. New-onset arrhythmias — particularly atrial fibrillation with rapid ventricular response — increase myocardial oxygen demand while reducing filling time. Acute valvular pathology (mitral regurgitation, aortic stenosis decompensation) and acute myocardial ischemia or infarction are additional precipitants. An important and underappreciated concept is that most acute heart failure involves fluid redistribution rather than true volume overload — vascular redistribution from splanchnic beds to the pulmonary vasculature can produce flash pulmonary edema without any actual change in total body water.
HFrEF vs. HFpEF
Heart failure with reduced ejection fraction (HFrEF, EF 40 percent or below) involves systolic dysfunction with reduced contractility. Heart failure with preserved ejection fraction (HFpEF, EF 50 percent or above) involves diastolic dysfunction with impaired relaxation and filling, often occurring in elderly, hypertensive, and obese patients. Heart failure with mildly reduced ejection fraction (HFmrEF, EF 41-49 percent) occupies an intermediate zone. ED management of acute decompensation is similar regardless of EF category.
Clinical Assessment
History
The history should explore dyspnea (exertional, orthopnea, and paroxysmal nocturnal dyspnea), weight gain, peripheral edema, abdominal distension, medication compliance (particularly diuretics, ACE inhibitors, and beta-blockers), dietary sodium and fluid intake, prior hospitalizations, baseline EF, and the presence of implantable devices such as ICDs or CRT devices.
Physical Examination
Jugular venous distension is the best bedside indicator of elevated filling pressures. Lung crackles may be absent in chronic heart failure due to lymphatic compensation. An S3 gallop indicates volume overload and rapid ventricular filling. Bilateral pitting peripheral edema is dependent. Hepatomegaly and hepatojugular reflux reflect right-sided congestion. Cool extremities, a narrow pulse pressure, and altered mental status suggest low cardiac output.
Diagnostics
BNP below 100 pg/mL or NT-proBNP below 300 pg/mL effectively excludes acute heart failure. However, elevated BNP does not confirm heart failure — pulmonary embolism, renal failure, sepsis, atrial fibrillation, and COPD can all elevate levels. Obesity reduces BNP levels, potentially producing falsely low results. Age-adjusted NT-proBNP cutoffs improve specificity. Chest X-ray may show cardiomegaly, cephalization of pulmonary vessels, Kerley B lines, pleural effusions, and interstitial or alveolar edema, but can be normal in up to 20 percent of cases. ECG assesses for arrhythmia, ischemia, LVH, and conduction abnormalities. Point-of-care ultrasound is invaluable: cardiac views provide a visual estimate of EF, wall motion assessment, and detection of pericardial effusion and valvular pathology; lung ultrasound showing bilateral B-lines (three or more per zone) indicates pulmonary edema with high sensitivity; and a plethoric IVC (greater than 2.1 cm with less than 50 percent inspiratory collapse) suggests elevated central venous pressure. Laboratory studies should include troponin (to assess for ACS as a precipitant), BMP (renal function and electrolytes), CBC, and hepatic panel in right-sided failure.
ED Management
Acute Pulmonary Edema — Prioritized Approach
1. Non-Invasive Positive Pressure Ventilation (NIPPV)
CPAP or BiPAP should be applied immediately — it is the single most impactful early intervention in acute pulmonary edema. It improves oxygenation, reduces both preload and afterload, and decreases the work of breathing. Strong evidence shows it reduces the intubation rate (NNT 8) and mortality (NNT 13) compared to standard oxygen. Starting settings are CPAP at 5 to 10 cmH2O or BiPAP with IPAP 10-15 and EPAP 5-8.
2. Nitroglycerin (Vasodilator Therapy)
Nitroglycerin is the first-line pharmacologic agent for acute hypertensive pulmonary edema. At lower doses it acts primarily as a venodilator to reduce preload, and at higher doses it provides arteriolar dilation to reduce afterload. The standard approach begins with sublingual NTG 0.4 mg every 5 minutes, followed by an IV infusion starting at 20 to 50 mcg/min and titrating upward. A high-dose bolus strategy — 400 to 2000 mcg IV bolus, repeated every 3 to 5 minutes — provides rapid symptom improvement, particularly in flash pulmonary edema, and avoids the delay of waiting for an infusion to take effect. This approach has limited RCT evidence and carries a concern for hypotension. Nitroglycerin should be avoided in hypotension (SBP below 100), severe aortic stenosis, right ventricular infarction, and recent PDE5 inhibitor use. A critical concept is that NTG is more important than furosemide in the first minutes of acute pulmonary edema management.
3. Diuretics
IV furosemide is appropriate for patients with true volume overload. If the patient takes furosemide at home, give 1 to 2.5 times their daily oral dose intravenously. For diuretic-naive patients, furosemide 20 to 40 mg IV is a starting dose. The onset of action includes an early venodilatory effect within 5 to 15 minutes, with diuresis beginning at 30 to 60 minutes. The DOSE trial showed a trend toward greater symptom relief with a high-dose strategy. For diuretic resistance, adding a thiazide (metolazone 5 to 10 mg) provides synergy. In patients with redistribution-type acute heart failure (flash pulmonary edema), the primary problem is not volume overload, making vasodilators more important than diuretics.
4. Morphine — Use with Caution
Morphine was traditionally used for anxiolysis and venodilation in acute heart failure. However, multiple observational studies associate morphine use with increased intubation rates and mortality. It is not recommended as routine first-line therapy and should be considered only if severe anxiety or agitation persists despite NIPPV and nitroglycerin.
Cardiogenic Shock Management
Cardiogenic shock presents with hypotension (SBP below 90) and signs of poor perfusion including confusion, cold extremities, and oliguria. Norepinephrine is the first-line vasopressor, as it maintains coronary perfusion and causes less tachycardia than dopamine. Inotropes — dobutamine (which increases contractility while reducing SVR) or milrinone (which provides both vasodilation and inotropy) — support cardiac output. Vasodilators and aggressive diuresis must be avoided in the hypotensive patient. Emergent echocardiography is essential to assess the cause (MI, valvular catastrophe, tamponade). Mechanical circulatory support with an IABP, Impella, or ECMO is considered in refractory cases, with cardiology and cardiac surgery consultation.
New-Onset Atrial Fibrillation with RVR
Rate control with IV diltiazem (0.25 mg/kg bolus) or metoprolol (5 mg IV) is first-line. Beta-blockers should be avoided in acute decompensated HFrEF with marginal blood pressure due to their negative inotropic effects. Amiodarone is useful in hemodynamically unstable patients or those with concurrent HFrEF. Cardioversion is indicated for hemodynamically unstable patients.
Acute Valvular Emergencies
Acute Mitral Regurgitation
Acute mitral regurgitation from papillary muscle rupture (post-MI), chordae tendineae rupture, or endocarditis presents with acute pulmonary edema and a new systolic murmur. Afterload reduction with nitroprusside or nitroglycerin increases forward flow. Emergent surgical consultation is required.
Acute Aortic Regurgitation
Acute aortic regurgitation from endocarditis, aortic dissection, or trauma produces a wide pulse pressure, a diastolic murmur, and acute pulmonary edema. Emergent valve replacement may be needed. The intra-aortic balloon pump is contraindicated because it worsens regurgitation during diastole.
Disposition
Discharge Considerations
Discharge may be appropriate for mild exacerbations with rapid treatment response, stable vital signs, improved symptoms, adequate oxygenation, a reliable patient with established outpatient cardiology follow-up, and completed medication reconciliation and dietary counseling. An observation unit is useful for borderline patients.
Admission Criteria
Admission is indicated for new-onset heart failure requiring workup, significant respiratory distress or hypoxemia requiring NIPPV, troponin elevation suggesting ACS as a precipitant, electrolyte abnormalities needing correction, renal insufficiency with inadequate diuretic response, and hemodynamic instability.
<image>A clinical infographic showing the four hemodynamic profiles of acute heart failure arranged in a 2x2 grid. The x-axis represents perfusion status (warm vs. cold) and the y-axis represents congestion status (wet vs. dry). Each quadrant includes: the profile name, prevalence percentage, key clinical findings, and initial ED treatment approach. Wet-Warm (largest quadrant): vasodilators and diuretics. Wet-Cold: vasopressors, inotropes, cautious diuresis. Dry-Warm: adjust medications. Dry-Cold: volume challenge, inotropes. The wet-cold quadrant is highlighted in red to indicate highest acuity.</image>
<image>A side-by-side lung ultrasound comparison panel showing normal lungs versus acute pulmonary edema. The left panel shows A-lines (horizontal reverberation artifacts) indicating normal aerated lung. The right panel shows confluent B-lines (vertical hyperechoic artifacts extending from the pleural line to the bottom of the screen) indicating interstitial and alveolar edema. Below each ultrasound image is a corresponding chest X-ray of the same condition for comparison. Labels indicate that 3 or more B-lines per intercostal zone bilaterally indicates pulmonary edema with sensitivity greater than 90%.</image>
Clinical Pearls
NIPPV (CPAP or BiPAP) should be applied immediately in acute pulmonary edema — it is the single most beneficial early intervention, and delay in applying it costs lives. Nitroglycerin is more important than furosemide in the first minutes of flash pulmonary edema because the problem is often redistribution, not total body volume excess. A BNP below 100 pg/mL essentially rules out acute heart failure as the cause of dyspnea. Lung ultrasound showing bilateral B-lines is more sensitive than chest X-ray for detecting pulmonary edema. Morphine is associated with worse outcomes in acute heart failure and should not be used routinely. In cardiogenic shock, norepinephrine is preferred over dopamine as the first-line vasopressor. Always identify and treat the precipitant — whether it is ACS, arrhythmia, medication non-compliance, dietary indiscretion, or infection. Do not forget right ventricular failure — IVC ultrasound and right-sided ECG help identify RV-dominant pathology, which requires a fundamentally different management approach centered on volume support and avoidance of vasodilators.
References
- Mebazaa A, et al. Acute heart failure management in the emergency department. Eur Heart J Acute Cardiovasc Care. 2023;12:537-553.
- Felker GM, et al. DOSE Trial: Diuretic strategies in acute decompensated heart failure. NEJM. 2011;364:797-805.
- Vital FM, et al. Non-invasive positive pressure ventilation for acute cardiogenic pulmonary edema. Cochrane Database Syst Rev. 2013.
- Levy P, et al. Treatment of severe decompensated heart failure with high-dose IV nitroglycerin. Ann Emerg Med. 2007;50:144-152.
- McDonagh TA, et al. 2021 ESC Guidelines for the diagnosis and treatment of acute and chronic heart failure. Eur Heart J. 2021;42:3599-3726.
