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If a review doesn't mention what goes wrong, it isn't complete. If a valve doesn't close tightly (regurgitation) or doesn't open wide enough (stenosis), the blood creates turbulence—a "sloshing" or "whooshing" sound called a . Instead of a clean "Lub-Dub," you might hear a "Lub-Whoosh-Dub."
The "lub" is the first heart sound (S1) and signals the beginning of , the phase when the heart's lower chambers (ventricles) contract to pump blood out. why does the heart make a lub dub sound