S1 and s2 heart sounds11/7/2023 ![]() ![]() If the sound is LOUD – It indicates Systemic hypertension and Pulmonary hypertension.If the sound is QUIET – Then it is the diagnosis of Low cardiac output, Aortic regurgitation, and Calcific aortic stenosis.P2 is better heard in the pulmonary area(Left parasternal area and at the level of 2nd intercostal space), while A2 is best heard in the Aortic area(Second right intercostal space). Take a listen to the audio example provided below. When the mitral valve closes significantly before the tricuspid valve, each valve produces a distinct audible sound.Īt the end of systole, the aortic (A2) and pulmonary (P2) valves close, producing the second heart sound (S2). Only a single cardiac sound is usually heard because the mitral and tricuspid valves collapse virtually simultaneously.Īlthough a “split S1” sound can be heard in 40 percent to 70 percent of healthy people, as well as in certain cardiac disorders. The M1 sound occurs just before the T1 sound. If the sound is VARIABLE – This condition mainly the sign of Complete heart block, Atrial fibrillation, and Extrasystoles.īecause T1 is substantially weaker than M1, a split S1 heart sound is best detected at the tricuspid listening post(Left 5th Intercostal space, along the sternal border).If the sound is LOUD – The this loud noise can be sign of Mitral stenosis, Short P-R interval, Increased cardiac output and large stroke volume also.If the sound is QUIET – Then it helps to diagnose various conditions like Low cardiac output, Long P-R interval or first degree heart block, Rheumatic mitral regurgitation and poor left ventricular function. ![]() ![]() This sound is beast heard at the level of apex of the heart. The sound produced by the mitral valve closing is known as M1, while the sound produced by the tricuspid valve closing is known as T1. The First Heartbeat (S1) The shutting of the mitral and tricuspid valves causes the first heart sound. ![]()
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