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为评价QT间期离散度（QTcd）测定的重复性，研究了同一观测者不同时间及两个观测者同一时间测定的46例急性心肌梗塞者的QTCd测定值的变化。结果发现同一观测者不同时间测定的QTcd的绝对误差为6ms，相对误差为20.1％，二者的相关系数r＝0．71，P＜o.01；两个观测者同一时间测定的QTcd的绝对误差为8ms，相对误差为23．9％，二者的相关系数r＝0．65，P＜0．01。提示，QTcd测定的重复性较差。
To evaluate the repeatability of the QTcd determinations, the QTCd values of 46 patients with acute myocardial infarction at the same time from the same observer and at the same time from two observers were studied. The results showed that the absolute error of QTcd was 6 ms and the relative error was 20.1%. The correlation coefficient r = 0.71, P <0.01 between the two observers at the same time. The QTcd absolute The error was 8ms, the relative error was 23.9%, the correlation coefficient between the two was r = 0.65, P <0.01. Tip, QTcd measurement repeatability is poor.