Friday, February 28, 2014

Heart Sounds

S1: closure of mitral and tricuspid valves. S2: closure of aortic and pulmonary artery valves. S2 may be split with normal inspiration (aortic valve closes first), RBBB, pulmonary embolism. A paradoxical split is when the aortic closes after the pulmonic valve, as can occur in LBBB, pacemaker, LV dysfunction. A fixed split can occur in atrial septal defect.
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