second heart sound

second heart sound
(S2) the heart sound occurring during closure of the two semilunar valves at the beginning of diastole, and heard as a “dupp”sound. It consists of two sharp, high frequency vibrations representing closure of the aortic (A2) then pulmonary (P2) valves; the sounds are generally merged on expiration but split on inspiration in normal adults.

Medical dictionary. 2011.

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