The S1 heart sound is primarily caused by the closure of two valves:
When the ventricles contract, ventricular pressure rises rapidly, exceeding atrial pressure. This forces the AV valves to snap shut. The sound is produced by: what causes s1 heart sound
The loudness of S1 varies with the :
: The timing of the S1 sound in relation to other heart sounds and events can help diagnose conditions such as heart block or issues with the heart's electrical conduction system. The S1 heart sound is primarily caused by