Gaasch W H, Blaustein A S, Bing O H
J Am Coll Cardiol. 1985 Apr;5(4):891-7. doi: 10.1016/s0735-1097(85)80429-0.
Segmental early relaxation, a form of left ventricular asynchrony, refers to lengthening of a myocardial segment before mitral valve opening. This phenomenon may occur in normal and diseased hearts; when it is seen in a diseased ventricle it may occur in either the abnormally contracting segment or the normal segment. Experimental data indicate that altered loading conditions, especially nonuniform distribution of load or functional inhomogeneities (as may occur with regional ischemia), or both, may result in asynchronous relaxation of the left ventricle.
节段性早期舒张，一种左心室不同步的形式，指的是二尖瓣开放前心肌节段的延长。这种现象可发生于正常心脏和病变心脏；当在病变心室中出现时，可发生于异常收缩节段或正常节段。实验数据表明，负荷条件改变，尤其是负荷分布不均或功能不均一性（如局部缺血时可能出现的情况），或两者兼而有之，可能导致左心室舒张不同步。
