S1 Sound Heart Jun 2026

A healthcare professional can assess the S1 sound, along with the second heart sound (S2), to evaluate heart health and detect potential issues.

The S1 sound is primarily produced by the : the mitral valve and the tricuspid valve . S1 Heart Sound - Learn How to Auscultate (Part 8) s1 sound heart

The first heart sound (S1) is the audible vibration produced by the sudden closure of the atrioventricular (AV) valves — the mitral and tricuspid valves — at the onset of ventricular systole. It marks the beginning of mechanical systole and is classically described by the syllable in the normal cardiac cycle (“lub-dub”). S1 is typically louder, longer, and lower in pitch than the second heart sound (S2). Understanding S1 is fundamental to cardiac auscultation, as its intensity, splitting, and timing provide critical diagnostic clues to valvular and myocardial function. A healthcare professional can assess the S1 sound,