The S1 sound is produced by the closure of the atrioventricular valves, specifically the mitral valve (between the left atrium and left ventricle) and the tricuspid valve (between the right atrium and right ventricle). When these valves close, they produce a sharp, high-pitched sound that is audible as the S1 sound.
An abnormal S1 sound can indicate various heart conditions, such as: s1 sound heart
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The first heart sound (S1) is produced by the closing of the mitral and tricuspid valves at the beginning of systole, which is the contraction phase of the heart. This sound is a result of the ventricles contracting and pumping blood into the aorta and pulmonary artery. The S1 sound is often described as a "lub" and is the first part of the typical "lub-dub" sound heard when listening to the heart with a stethoscope. The first heart sound (S1) is produced by