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早在廿年代,Wiggers就提出将心动周期分为8个时相,等容收缩期即是其中之一。此后各国学者虽然采用了各种方法测定等容收缩时间(Isovolumic Contraction Time,ICT),但由于测定方法不够精确、简便,测定指标不够统一,临床未能推广应用。近年来应用超声心动图测定IC了准确、方便、重复性好,而且ICT具有不受心率和束枝传导阻滞影响的特点,较为直接地反映心血管机能状况,故临床应用日益重视。各种无创性方法测定ICT 无创性方法测定ICT,除了对病人无损伤,易于重复,方法简便等优点外,还避免了
As early as the 1920s, Wiggers proposed that the cardiac cycle be divided into eight phases, and isovolumic systolic phase is one of them. Since then, scholars from various countries have adopted various methods to determine the Isovolumic Contraction Time (ICT). However, due to the lack of accuracy and simplicity of the determination methods and the unification of the measurement indexes, the clinical application has not been promoted. In recent years, the application of echocardiography IC is accurate, convenient and reproducible, and ICT is not affected by heart rate and bundle branch block characteristics, a more direct reflection of cardiovascular status, so the clinical application of increasing importance. Various noninvasive methods to determine ICT noninvasive methods for the determination of ICT, in addition to the patient without injury, easy to repeat, the method is simple and so on, but also to avoid