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【答】心肌顺应性系指压力——容积曲线表达心脏内不同压力时的心容积。曲线上容积变化数值与压力变化数值的比率(△V/△P)则称为顺应性,也称应变性。顺应性小意味着心肌伸展阻力大,顺应性大意味着伸展阻力小。在一定范围内,心肌初长增加时,收缩产生的张力也增加。心肌的初长取决于心室收缩前进人心室的血液量(心室舒张末期)。由于心室内容积的测定比较困难,所以临床上常用心室收缩前的压力(心室舒张末期压力)来间接表示心室肌的初长或前负荷的大小。不过舒张末期压和心肌纤维长度的关系受心肌顺应性的影响很大。当心肌顺应性小时(如向
【Answer】 Myocardial compliance refers to the volume of the heart that expresses different pressures within the heart under pressure-volume curves. The ratio of the volume change value to the pressure change value (ΔV / ΔP) on the curve is called compliance, also called strain. Small compliance means that the myocardial stretch resistance, large compliance means stretching resistance is small. Within a certain range, when the initial length of the myocardium increases, the tension generated by the contraction also increases. The initial length of the myocardium depends on the amount of blood that progresses to the ventricles of the ventricle (end-diastolic). As the determination of ventricular volume more difficult, so commonly used in clinical ventricular systolic pressure (ventricular end-diastolic pressure) to indirectly represent the size of ventricular pre-length or load. However, the relationship between end-diastolic pressure and myocardial fiber length is strongly influenced by myocardial compliance. When myocardial compliance hours (such as to