<原著>左心室表層心筋張力の急性虚血による変化

概要

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Myocardial strain gauge arch was sutured on the left ventricular anterior free wall and the left anterior descending coronary artery was completely occluded for 20 seconds in 7 open-chest dogs. Complete Iocclusion of the coronary artery caused a rapid reduction of the positive deflection in the early systole which rapidly developed into a negative deflection (Notch 1) and occupied a major portion of the systolic bulge. As Notch 1 increased in its depth, the positive deflection in the late systole also decreased in its amplitude and turned into another negative deflection (Notch 2) at the end of 20 seconds. The depth in Notch 2 was always less than that in Notch 1. Notch 1 was made 12 msec after the beginning of left ventricular ejection and 5 msec before the maximum acceleration of aortic flow on the average. Notch 2 was recorded 5 msec prior to the end of left ventricular ejection on the average. It is considered that these changes in the left ventricular wall tension have a close correlation with the intracardiac events and that these negative deflections measured on the ischemic myocardium might cause a tension on the myocardium which forces the ischemic myocardium to bulge out during systole. It is also considered that the left ventricle might not bulge uniformly during the whole systole.
近畿大学の論文
1978-04-25