HFrEF vs HFpEF
How to tell HFrEF and HFpEF apart when a board question makes them look alike.
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Ejection fraction threshold on echocardiography is the branch point: below 40% indicates HFrEF, at least 50% indicates HFpEF.
Side by side
Reduced left ventricular ejection fraction under 40% with volume overload symptoms identifies heart failure with reduced ejection fraction and activates quadruple guideline-directed therapy.
Heart failure signs with ejection fraction at least 50% and diastolic dysfunction pattern identifies heart failure with preserved ejection fraction.
Systolic pump failure from myocardial injury or remodeling lowers forward output and activates maladaptive neurohormonal pathways.
Impaired ventricular relaxation and increased stiffness raise filling pressures despite preserved systolic ejection fraction.
Echocardiography shows EF below 40% and often ventricular dilation; natriuretic peptides are elevated and renal function and potassium guide safe initiation of ARNI, MRA, and diuretic therapy.
Echocardiography shows EF at least 50% with left atrial enlargement or diastolic dysfunction indices, natriuretic peptides may be elevated, and comorbidity burden such as hypertension or atrial fibrillation is common.
The trap
All symptomatic heart failure is treated with loop diuretics alone, but HFrEF mortality benefit requires neurohormonal blockade started early and titrated, whereas HFpEF management prioritizes congestion relief and comorbidity control.
The repair move
Next best step: treat congestion with IV loop diuretic such as furosemide 40 mg IV, then begin HFrEF guideline-directed therapy once stable: sacubitril-valsartan 49/51 mg twice daily or ACE inhibitor if needed, evidence-based beta blocker such as metoprolol succinate 12.5 to 25 mg daily, mineralocorticoid receptor antagonist such as spironolactone 25 mg daily if renal function and potassium allow, and SGLT2 inhibitor such as dapagliflozin 10 mg daily. For HFpEF, use diuretics for volume control, start SGLT2 inhibitor, and aggressively manage blood pressure, atrial fibrillation, obesity, and ischemia.
Try a free question
CoreA 64-year-old man is hospitalized for dyspnea and edema. BP 112/70 mm Hg, HR 96/min, temp 36.1 C, oxygen saturation 91% on room air. Echocardiography shows EF 28%. After IV diuresis improves symptoms, what is the next best step in management?
Show answer and explanation
Answer: A. Start comprehensive HFrEF guideline-directed therapy including beta blocker, renin-angiotensin inhibition, MRA, and SGLT2 inhibitor. Reduced EF heart failure requires initiation of foundational disease-modifying medications after stabilization, not symptom-only therapy.
Why the other choices are tempting
- B. Wrong because diuretics alone improve congestion but not mortality in HFrEF.
- C. Wrong because deferring therapy misses a high-risk transition window.
- D. Wrong because calcium channel blocker monotherapy is not foundational HFrEF treatment.
- E. Wrong because symptom improvement does not eliminate need for chronic neurohormonal therapy.
Flashcards
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What echocardiographic EF cutoff defines HFrEF for guideline-directed mortality-reducing therapy?
An ejection fraction below 40% defines HFrEF and prompts comprehensive neurohormonal therapy.
What management focus dominates HFpEF compared with HFrEF?
HFpEF management centers on diuresis and comorbidity control, while HFrEF requires disease-modifying neurohormonal drug titration.
Quick answers
What is the fastest way to tell HFrEF from HFpEF?
Ejection fraction threshold on echocardiography is the branch point: below 40% indicates HFrEF, at least 50% indicates HFpEF.
What is the key clue for HFrEF?
Reduced left ventricular ejection fraction under 40% with volume overload symptoms identifies heart failure with reduced ejection fraction and activates quadruple guideline-directed therapy.
What is the key clue for HFpEF?
Heart failure signs with ejection fraction at least 50% and diastolic dysfunction pattern identifies heart failure with preserved ejection fraction.
What is the common trap with HFrEF vs HFpEF?
All symptomatic heart failure is treated with loop diuretics alone, but HFrEF mortality benefit requires neurohormonal blockade started early and titrated, whereas HFpEF management prioritizes congestion relief and comorbidity control.