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Uptodate Reference Title
Physiological splitting of the second heart sound
Physiological splitting of the second heart sound
Phonocardiogram recorded at the left upper sternal border in a healthy child showing physiologic splitting of S2 that varies with the respiratory cycle. S2 is split in inspiration and single in expiration.
S1: first heart sound; S2: second heart sound; A2: aortic valve closure sound; P2: pulmonic valve closure sound.
