Heart sounds are the noises generated by the heart's activity, primarily caused by the opening and closing of heart valves. There are four heart sounds, labeled S1 to S4, but we'll focus on S1.
The heart sound S1 (the first heart sound) corresponds to the phase of Systole .
Can sometimes indicate a narrowing of the heart valves (mitral stenosis) or a hyperdynamic state (like exercise or fever).
Might suggest that the heart muscle isn't contracting forcefully or that there is fluid muffling the sound. To put it simply: S1 is the sound of the start of systole.
The S1 heart sound is an essential component of the cardiac physical examination. Changes in the S1 sound can indicate various cardiac conditions, such as:
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