Investigation regarding the VIth cardiac sound under pathological and normal physiological condition

Abstract

Starting from the fact that specialty data regarding a VIth cardiac sound, are scarce the paper studies the phonocardiogram recorded on four frequency bands in parallel with a EKG derivation and a carotid pulse in a lot of 532 persons (healthy and sick) using a 6-NEK-4-apparatus. The presence of this sound has not been remarked in healthy persons. In 5% out of the tested sick that presented aortic insufficiency we remarked the presence of a VIth cardiac sound of a low frequency and amplitude, possibly of a vascular nature. In all the patients that exhibited this VIth sound a 50% increase of the left ventricle ejection period as well as a 26% increase of the preejection period was noticed. The presence of this sound in the aged patients with stenosis and aortic insufficiency, exhibiting reductions of the vascular wall elasticity was not remarked.