ObjectiveTo explore the clinical predictive value of electrocardiogram in patients with variant angina(VA) for malignant ventricular arrhythmia(MVA).

MethodsOne hundred and thirty-six patients with VA were divided into the NMVA group and MVA group according to whether to merge MVA(68 cases each group).The electrocardiogram in two groups were detected.The ECG parameters between two groups were compared and the likelihood of MVA was predicted.

ResultsDuring acute exacerbation, the QT interval(cQT), QT interval dispersion(cQTd) of the electrocardiogram parameters, corrected T-peak to the end of the T-wave(cTp-e), corrected Tp-e dispersion(cTp-ed), interval between the T wave peak and T wave end(Tp-e/QT) and ST segment elevation(STE) value in MVA group were significantly higher than those in NMVA group(P < 0.05 to P < 0.01).The results of ROC curve analysis showed that the area under the ROC curve (AUC) of cTp-e, cTp-ed, Tp-e/QT and STE were significantly larger than those of cQTd(P < 0.05), which of Tp-e/QT was significantly greater than that of cTp-ed and STE(P < 0.05), and there was no statistical significance that of between cTp-ed and STE(P>0.05).The predictive value of cQTd and STE were moderate, and the predictive value of the cTp-e, cTp-ed and Tp-e/QT were high.The cTp-ed and Tp-e/QT were closely related to the MVA in VA patients(P < 0.05).

ConclusionThe cQTd, cTp-e, cTp-ed, Tp-e/QT and STE can predict the occurrence of MVA.The predictive value of cTp-ed and Tp-e/QT are higher, and which can be used as the primary observation indicators to predict the occurrence of MVA in patients with VA.