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Exposure of the heart in the course of chest surgery affords a means of faithfully recording pressure pulses in the four chambers of the heart and in the large vessels of human subjects. This study in 13 individuals without any clinical evidence of cardiovascular disease, is concerned with the time relationship between electric and mechanical events and with the temporal sequence and respective characteristics of similar phases of the cardiac cycle in both sides of the heart. The results obtained by permutation of simultaneous pressure recordings confirm the classical observations made in dogs.

Time Relationship of Dynamic Events in the Cardiac Chambers, Pulmonary Artery and Aorta in Man