Movement of mitral valve cusps in relation to first heart sound and opening snap in patients with mitral stenosis.

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Abstract
Synchronized recordings of the movements of the cusps and annulus of the mitral valve and of the heart sounds were made in 10 patients with mitral stenosis. Two types of cusp movement were described. The abrupt cessation of movement of the valve into the left atrium coincided with the mitral component of the 1st sound, and cessation of movement into the left ventricle coincided with the opening snap. The delay which was noted between the cross-over positions on atrial and ventricular pressure traces and the occurrence of the 1st heart sound and the mitral opening snap were explained.