Splitting of second heart sound in patients with aortic regurgitation.

The intervals between the two components of the second heart sound (A2-P2), measured from the phonocardiograms of 50 patients with severe aortic regurgitation, were compared with those of 57 normal subjects. During expiration the second sound was single or closely split in both groups. Inspiratory augmentation of the A2-P2 interval of less than 0.02 sec… (More)