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收缩时间间期(Systolic Time Intervals简称STI)测定是目前唯一以时间变量反映心脏工作状况的非侵入性检查方法。早在1904年Bowen、1926年Lambard等人就应用颈动脉搏动图来评价左心喷血时间,并发现与心率有关。六十年代起,随着心导管和心血管造影术的不断发展,许多作者开始研究血液动力学与收缩时间间期的关系。业已证实,体表测定的STI与心导管术测得的主动脉压力曲线的STI基本一致。并进一步证实STI值与其它左心功能参数,诸如左室压力
Systolic Time Intervals (STI) is the only noninvasive test that reflects the working condition of the heart in time. As early as 1904, Bowen, 1926, Lambard and others on the application of carotid pulsation to assess left ventricular ejection time, and found to be related to heart rate. Since the 1960s, with the continuous development of cardiac catheterization and cardiovascular angiography, many authors began to study the relationship between hemodynamics and the time period of contraction. It has been demonstrated that the STI measured on the body surface is basically consistent with the STI of the aortic pressure curve measured by cardiac catheterization. And further confirmed STI values and other left ventricular function parameters, such as left ventricular pressure