🫀 S3 vs S4 Heart Sounds — Know the Difference 🎧 Extra heart sound? Timing is everything. 🔵 S3 = Early diastole Rapid ventricular filling into a dilated, volume-overloaded ventricle. Often seen in systolic dysfunction (HFrEF). 🔴 S4 = Late diastole Atrial contraction forcing blood into a stiff, non-compliant ventricle. Associated with hypertension, LVH, and diastolic dysfunction. ⏱ Early = volume problem. ⏱ Late = compliance problem. If you can’t tell which is which, you don’t understand heart
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🫀 S3 vs S4 Heart Sounds — Know the Difference 🎧 Extra heart sound? Timing is everything. 🔵 S3 = Early diastole Rapid ventricular filling into a dilated, volume-overloaded ventricle. Often seen in systolic dysfunction (HFrEF). 🔴 S4 = Late diastole Atrial contraction forcing blood into a stiff, non-compliant ventricle. Associated with hypertension, LVH, and diastolic dysfunction. ⏱ Early = volume problem. ⏱ Late = compliance problem. If you can’t tell which is which, you don’t understand heart
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