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The second heart sound results from the sudden tensing of the semilunar leaflets as these valves close at the end of systole.
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Affirms classic S2 mechanism for auscultation teaching; leaves open modern imaging confirmation of leaflet dynamics.
Shortly after Laennec introduced the art of auscultation, authorities were in general agree- ment that the second heart sound results from the sudden tensing of the semilunar leaf- lets as these valves close at the end of systole.
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McKusick et al. (1957) studied this question. The second heart sound results from the sudden tensing of the semilunar leaflets as these valves close at the end of systole.
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