Lub Dub Heart Sound __link__

The , the “lub,” marks the beginning of systole—when the heart contracts to push blood out. But here’s the twist: it’s not blood moving that makes the noise. It’s the sudden closure of the mitral and tricuspid valves between the atria and ventricles. Think of it as two doors slamming shut at once, creating a low-pitched, dull “lub.” If the sound is sharp or split, it might hint at conditions like mitral valve prolapse or right bundle branch block.

The "lub dub" sound is a familiar and reassuring sound that is often associated with a healthy heart. It's the sound of the heartbeat, and it's produced by the opening and closing of the heart's valves. lub dub heart sound

Clinicians have coined unforgettable names for abnormal sounds: The , the “lub,” marks the beginning of

Lub = Valves closing to push blood OUT. Dub = Valves closing to let blood IN. Think of it as two doors slamming shut

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Even the lub-dub itself has medical poetry: in complete heart block, you might hear a with occasional cannon waves; in pericarditis, a scratchy, leathery sound called a friction rub replaces the smooth lub-dub entirely.