QT离散度对急性心肌梗塞早期室性心律失常发生的预测价值

The significance of QTd in predicting ventricular arrhythmia at the early stage of acute myocardial infarction

回顾性单盲法分析99例急性心肌梗塞（AMI）发病24h内首次心电图未校正的QT离散度（QTd）、心率校正QT离散度（QIcd）和改良心率校正QT离散度（QTLcd），以各种离散度≥60ms为标准对预测发病1周内发生室性心作失常的敏感度分别为74.1％、81．5％和74.1％，特异度分别为52．8％、14．4％和63．9％，在敏感度无显著差异的情况下，QTLcd的特异度明显高于QTcd（P＜0.05）。认为临床选用QTLcd≥60ms作为预示AMI早期室性心律失常发生的方法更具价值。

The QT dispersion (QTd ), eorrected QT dispersion (QTcd ), and logical corrected QT dispertion (QTLcd ) of 99 patients with acute myocardial infaretion (AMI) were reviewed on the first ECG within 24 hours after onset of AMI. Using dispersion period ＞ 60 ms as the eriteria for prediction ventrieular arrhythmia within one week of AMI, the sensitivity was 74. 1 %. 81. 5 % and 74. 1 %, rcspectively, specificity Was 52. 8 N, 44. 1 % and 63. 9 %. There was no significant difference in sensitivity, but QTLcd had much higher speeifieity than QTcd (P＜0. 05 ). The results suggest that QTLcd has relatively high signifieance in predieting ventricular arrhythmia at the early stage of AMI