The cause and clinical significance of diastolic heart sounds
Abstract:
Auscultation becomes more meaningful when the forces that cause the cardiac sounds are understood. We review the mechanisms responsible for the diastolic heart sounds and correlate them with various clinical conditions that affect their timing, loudness, and pitch. A careful search for these soft and illusive sounds should be included as part of every cardiac examination since their proper identification can supply important diagnostic and prognostic information.
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Heart Sounds
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
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Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.
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Abnormal Heart Sounds
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