((link)) | Heart Sound S1

The simultaneous closure of these two valves produces the S1 sound.

🎧 Listen closely. The heart tells a story with every beat.

A healthcare professional can assess S1 by:

Abnormalities in S1 can indicate various cardiac conditions, such as:

The first heart sound, S1, is produced by the closure of the atrioventricular valves (mitral and tricuspid valves) at the start of systole. This sound is often described as a "lub" and is the first of the two normal heart sounds.

S1 is primarily generated by vibrations within the cardio-hemic system caused by the abrupt halt of blood flow and the tensing of the chordae tendineae and valve leaflets. Under resting conditions, S1 typically lasts between , with a dominant frequency range of 30 to 150 Hz . Physiologically, S1 coincides with:

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The closure of the mitral and tricuspid valves creates a pressure wave that travels through the heart, producing the S1 sound. This sound is caused by:

Next time you listen to a heart, remember: says “time to squeeze” — and it all starts with valve closure.