The Movements of the Mitro-Aortic Ring Recorded Simultaneously by Cine-Roentgenography and Electrocardiography

Abstract

Roentgen moving pictures synchronized with electrocardiograms were taken of the movement of calcifications in the mitro-aortic ring in 2 cases. The author used the indirect method of cineroentgenography, the camera operated at 16 frames/sec.; each frame was marked on the electrocardiogram by an electric impulse. The shadow of the perimitral calcification traced a straight line from its highest to its lowest point and back again. Beginning at P, the annulus fibrosus stood still for about one-tenth of a second. Approx. between P and QRS, the annulus fibrosus began to be displaced toward the base of the heart, reaching its highest point immediately after the QRS-complex. Thereafter it shifted toward the apex of the heart at a fairly constant speed for about 0.3 of a sec. It reached its lowest point immediately after T and remained there for about 0.2 of a sec.