Left-sided heart failure vs Right-sided heart failure
How to tell Left-sided heart failure and Right-sided heart failure apart when a board question makes them look alike.
Left-sided failure: pulmonary congestion (dyspnea, crackles, S3); right-sided failure: systemic congestion (JVD, edema, ascites).
Side by side
Dyspnea, orthopnea, crackles, pulmonary edema, and reduced forward output.
JVD, hepatomegaly, ascites, peripheral edema, and systemic venous congestion; left-sided failure is the most common cause.
Left ventricle fails to move blood forward, backing pressure into pulmonary circulation.
Right ventricle fails to move blood through lungs, backing pressure into systemic veins.
Pulmonary edema with vascular cephalization, Kerley B lines, and bilateral pleural effusions on chest X-ray; S3 gallop; BNP above 400 pg/mL; PCWP above 18 mmHg; and reduced ejection fraction on echo support left-sided failure.
Elevated JVP above 8 cm H2O, hepatojugular reflux, pulsatile tender hepatomegaly, ascites, elevated central venous pressure, and dilated right ventricle on echo support right-sided failure. The most common cause in adults is left-sided failure, so isolated right failure should prompt a search for cor pulmonale, primary pulmonary hypertension, or right-sided valvular disease.
The trap
Dyspnea can appear in both, especially because right failure commonly follows left failure.
Watch it explained
The repair move
Ask where the congestion is visible: lungs or systemic veins, while remembering left failure often drives right failure.
Try a free question
CoreA patient has dyspnea, orthopnea, crackles, and pulmonary edema on chest imaging. Which side of heart failure is primarily suggested?
Show answer and explanation
Answer: A. Left-sided heart failure. Left-sided failure backs pressure into the pulmonary circulation, causing pulmonary edema.
Why the other choices are tempting
- B. Right-sided failure causes systemic venous congestion such as JVD and hepatomegaly.
- C. Nephrotic syndrome causes edema from protein loss, not pulmonary venous congestion.
- D. Cirrhosis causes ascites and edema from portal hypertension/hypoalbuminemia.
- E. Pulmonary embolism causes sudden dyspnea and pleuritic pain from vascular obstruction.
Flashcards
Tap a card to flip it.
What is the fastest separator for Left-sided heart failure vs Right-sided heart failure?
Left-sided failure: pulmonary congestion (dyspnea, crackles, S3); right-sided failure: systemic congestion (JVD, edema, ascites).
What clue should make you choose Left-sided heart failure?
Dyspnea, orthopnea, crackles, pulmonary edema, and reduced forward output.
Quick answers
What is the fastest way to tell Left-sided heart failure from Right-sided heart failure?
Left-sided failure: pulmonary congestion (dyspnea, crackles, S3); right-sided failure: systemic congestion (JVD, edema, ascites).
What is the key clue for Left-sided heart failure?
Dyspnea, orthopnea, crackles, pulmonary edema, and reduced forward output.
What is the key clue for Right-sided heart failure?
JVD, hepatomegaly, ascites, peripheral edema, and systemic venous congestion; left-sided failure is the most common cause.
What is the common trap with Left-sided heart failure vs Right-sided heart failure?
Dyspnea can appear in both, especially because right failure commonly follows left failure.