Frey M A, Kenney R A
J Appl Physiol. 1976 Jan;40(1):105-7. doi: 10.1152/jappl.1976.40.1.105.
Systolic time intervals are commonly used to identify changes in ventricular function. The method described facilitates measurement and calculation of many such intervals. This method utilizes a printed polygraph recording of electrocardiogram, phonocardiogram, and carotid pulse contour; a digitizing device for reading the necessary coordinates from the record; and a minicomputer for calculation of the intervals and for data analysis. Intervals related to approximately 100 pulse beats can be read, calculated, printed in chart and graph form, and subjected to some analyses in about an hour.
收缩期时间间期常用于识别心室功能的变化。所描述的方法便于测量和计算许多这样的间期。该方法利用心电图、心音图和颈动脉脉搏轮廓的印刷多导记录仪；一种用于从记录中读取必要坐标的数字化设备；以及一台小型计算机，用于计算间期和进行数据分析。与大约100次脉搏搏动相关的间期可以被读取、计算、以图表形式打印出来，并在大约一小时内进行一些分析。
