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对比分析４９例急性心肌梗塞患者１周内（急性期）与３个月（恢复期，１９例）及１ａ后（陈旧期，１５例）心电图Ｑ－Ｔ离散度（ＱＴｄ）变化及其差异．结果：急性期、恢复期及陈旧期，经心率校正的ＱＴｄ（ＱＴｃｄ）分别为：０．０５０７±０．０１８５，０．０３９９±０．０２１２，０．０３３７±０．０１９３（Ｐ＜０．０５）．前壁梗塞（包括前间壁，广泛前壁，ｎ＝２５）与下壁梗塞（包括后壁，ｎ＝２４）相比，ＱＴｃｄ分别为０．０５６０±０．０２２７和０．０４５０±０．０１０７；（Ｐ＜０．０１）．而未经心率校正的测算值差异无显著性．结果表明：急性心肌梗塞患者经心率校正的ＱＴ离散度明显增大，恢复期至陈旧期逐渐恢复，急性期前壁梗塞增大较下壁显著．这种变化是否掺杂除心率外的其他非梗塞因素的影响，值得关注．
The changes and differences of QTd of electrocardiogram in 49 patients with acute myocardial infarction within 1 week (acute stage), 3 months (recovery stage, 19 cases) and 1a (old stage, 15 cases) were compared. Results: The QTd (QTcd) corrected for heart rate in acute phase, convalescence phase and obsolete phase were 0.0507 ± 0.0185,0.0399 ± 0.0212,0.0337 ± 0.0193 (P <0. 05). QTcd was 0.0560 ± 0.0227 and 0.0450 ± 0.0107, respectively, in the anterior wall infarct (including the anterior wall, extensive anterior wall, n = 25) compared with inferior wall infarct (including the posterior wall, n = 24) ; (P <0.01). However, there is no significant difference between the measured values without correction of heart rate. The results showed that the QT dispersion of heart rate correction in patients with acute myocardial infarction was significantly increased, recovery gradually recovered to old age, the anterior wall infarction increased more significantly than the lower wall. It is worth noting whether this kind of change doubles the effects of other non-infarct factors besides heart rate.