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心脏收缩时间间期STI的测定是一种“非侵入性”定量试验之一,它具有重复性好,可靠性大等优点。早在很多年之前就能测定心动周期各时相,但只是在心导管术,心室造影术开展后,对心脏功能可以进行直接测量比较,才能对收缩时间间期,从现代临床生理学的角度予以评价。本文自的是根据最近资料予以概述。壹、心动周期的生理意义每一心动周期可分为收缩期与舒张期,它有着一系列变化:心房心室的舒缩,容积的变化,压力的变化,瓣膜的活动,血流方向的改变,心音等等。各种变化又可分为九个时相如表Ⅰ。正常人每分钟心跳若为75次/分,心动周期为0.80秒:收缩期0.35秒,舒张期0.34秒。
Cardiac systolic time STI determination is a “non-invasive” quantitative test, it has good reproducibility, reliability and so on. The timing of the cardiac cycle can be measured many years ago, but cardiac catheterization and ventricular angiography can be used to measure cardiac function directly in order to evaluate the systolic time period from the perspective of modern clinical physiology . This article is based on recent information to be summarized. One, the physiological significance of cardiac cycle Each cardiac cycle can be divided into systolic and diastolic, it has a series of changes: atrial and ventricular systolic and diastolic volume changes, changes in pressure, valve activity, changes in blood flow direction, Heart sounds and so on. Various changes can be divided into nine phases as shown in Table I. If the normal heart rate per minute if 75 beats / min, 0.80 seconds cardiac cycle: systolic 0.35 seconds, diastolic 0.34 seconds.