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心脏有收缩和舒张的功能,心脏的泵血功能有赖于心室的收缩来完成,而舒张则有利于血液回心。心脏收缩时间间期(STI)和舒张时间间期(DTI)的测定是评价左心室收缩与舒张功能的一种有重要价值的非损伤性检查方法。本文侧重介绍STI 的测定方法及临床意义,通过测量计算各间期及其比值作为左心室功能的判定指标。1.电-机械延迟时间(EML):从ECG 的QRS 复合波起点(反映心室电活动开始)到ACG 的C 点(反映心室开始收缩,左室压力开始升高)的间距(称Q—C 间期),或到PCG的第一心音高频、高振幅成分(即二尖瓣关闭成分,简写S_(1m))的间距(称Q-S_1或R-I 间
Heart systolic and diastolic function, heart pump function depends on ventricular contraction to complete, and diastolic blood is beneficial to the heart. Cardiac systolic time (STI) and diastolic time interval (DTI) determination is to evaluate left ventricular systolic and diastolic function of a valuable non-invasive method of inspection. This article focuses on the determination of STI and clinical significance, by measuring the interval and its ratio as a determination of left ventricular function indicators. 1. Electro-Mechanical Delay Time (EML): The separation from the beginning point of QRS complexes of ECG (reflecting the start of ventricular electrical activity) to the point ACG (reflecting contraction of the ventricle beginning to increase in left ventricular pressure) (Q-C Interval), or to PCG the first heart sound of high-frequency, high amplitude components (ie, mitral valve closing component, abbreviation S_ (1m)) spacing