Werner O
Scand J Clin Lab Invest Suppl. 1976;145:23-9.
242 computer-assisted exercise tests were studied. The computer performs simultaneous averaging of a 6- or 12-lead ECG, keeps track of the work load and time and labels all ECG records. Less than 1 per cent of atrial and ventricular extrasystoles were included in the computer average together with ordinary beats, while 80 per cent of all beats were averaged. Averaging reduced the peak-to-nadir QRS amplitude by 3-4 per cent at a sampling rate of 400/s and by 8-9 per cent at 200/s. Q waves with small beat-to-beat variation were usually well preserved after averaging while more variable QRS details often decreased in width or amplitude. The averaging program performed adequately on most kinds of arrhythmia. Averaging should not be used on pacemaker ECGs. Caution must be exercised in the presence of very frequent ventricular extrasystoles.
对242例计算机辅助运动试验进行了研究。计算机对6导联或12导联心电图进行同步平均，记录工作量和时间，并对所有心电图记录进行标注。计算机平均时，房性和室性早搏与正常搏动一起被纳入的比例不到1%，而所有搏动的80%被平均。在400次/秒的采样率下，平均使QRS波峰到波谷的振幅降低了3% - 4%，在200次/秒时降低了8% - 9%。逐搏变化小的Q波在平均后通常保存良好，而变化较大的QRS波细节通常宽度或振幅减小。平均程序对大多数类型的心律失常表现良好。平均法不适用于起搏器心电图。在存在非常频繁的室性早搏时必须谨慎使用。
