一.引言 以往对于心功能的研究主要集中于心收缩性能,晚近,心舒张性能的研究也愈益受到重视。心室收缩性能与舒张性能是紧密相联的,然而,两者的改变方向或程度不一定相同。例如,实验研究业已证实,各种心脏病中左心室舒张性能的改变往往是心功能异常最早且较显著的表现。因此,仅凭心收缩指标来评价心功能是不全面的, I. INTRODUCTION In the past, the studies on cardiac function mainly focused on the cardiac systolic performance. More recently, the study on cardiac diastolic performance has been paid more and more attention. Ventricular contractility and diastolic performance are closely linked, however, the direction or degree of change between the two may not be the same. For example, experimental studies have shown that changes in left ventricular diastolic function in a variety of heart diseases are often the earliest and more pronounced manifestation of cardiac dysfunction. Therefore, only heart rate index to evaluate cardiac function is not comprehensive,