Lub-dub Sounds (90% Trusted)

This sound occurs at the beginning of , the phase where your heart contracts to pump blood out to the body. Specifically, the "lub" is created by the closing of two valves: the mitral valve and the tricuspid valve (together called the atrioventricular valves).

The "lub-dub" sounds are caused by the opening and closing of the heart valves. Here's a step-by-step explanation: lub-dub sounds

Listening to the heart is called . It is typically performed using a stethoscope at four primary locations on the chest, corresponding to where the blood flows after passing through each valve. This sound occurs at the beginning of ,

In a healthy heart, the "lub-dub" is regular and predictable. Doctors listen for the (how fast it’s going) and the rhythm (the spacing between sounds). lub-dub sounds