Lub - Dub Dub Heart Sound

This third sound occurs shortly after S2 during the early phase of diastole (when the heart is resting and filling with blood). It is caused by a large volume of blood rushing rapidly into the ventricles, making the ventricular walls vibrate. When is it Normal?

The sequence of heart sounds can be broken down as follows: lub dub dub heart sound

Lub. Dub. Dub. Listen close — it’s never just two. This third sound occurs shortly after S2 during

The "lub dub dub" heart sound is a common way to describe the normal sounds of the heartbeat. These sounds are produced by the closing of the heart valves during the cardiac cycle. lub dub dub heart sound