Donders J J, van Der Hoeven G M, Snoeck B, Beneken J E
Bibl Cardiol. 1976(35):255-60.
Systolic time intervals (STI), measured non-invasively and during uninterrupted exercise, may contain information about cardiac function. A processing system was developed, which determines STI automatically from 8-sec recordings at each load level. A preprocessing unit provides automatic recording and optimal signal-to-noise ratios. One of the main tasks of the computer program, which is modular in structure and written in FORTRAN IV, is to recognize disturbances and artefacts in the signals. After selection of the complexes, usually with some kind of correlation method, a representative beat is found and the inclination points are localized. Besides these points, indicateions of possible errors are given. Preliminary results indicate that the system may be able to replace the human observer in estimating STI.
收缩期时间间期（STI），在不间断运动期间通过无创测量，可能包含有关心脏功能的信息。开发了一种处理系统，该系统可根据每个负荷水平的8秒记录自动确定STI。一个预处理单元可提供自动记录和最佳信噪比。该计算机程序结构模块化，用FORTRAN IV编写，其主要任务之一是识别信号中的干扰和伪影。在通常用某种相关方法选择复合波后，找到一个代表性的心搏并确定倾斜点的位置。除了这些点之外，还给出了可能错误的指示。初步结果表明，该系统在估计STI方面可能能够取代人工观测者。
