Lub-dub Sounds New! -

Spoiler alert: It’s not the heart muscle contracting, and it’s not the blood whooshing around.

That longer rest is crucial. It’s the moment when the heart fills up with blood again, preparing for the next "lub." Sometimes, a doctor doesn't hear a clean "lub-dub." Instead, they hear a "lub- shhh -dub" or a "lub-dub- whoosh ." This is called a heart murmur . lub-dub sounds

"The squeeze is starting. No blood is allowed back into the top rooms." Breaking Down the "Dub" (S2) The second sound, "Dub" (clinically known as S2 ), marks the end of systole and the beginning of rest (diastole). Spoiler alert: It’s not the heart muscle contracting,