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早期的研究显示,使QT间期延长的心脏交感神经支配不平衡,可以增加冠状动脉阻塞患者的心律失常以及降低心室颤动阈。本文旨在观察QT_c延长(>440毫秒)是否伴有心肌梗塞患者猝死发生率的增加。方法:患者组与配对对照组各55例。患者组在2个月至6年前患过心肌梗塞。在每份心电图中测定5个心搏的QT间期,QT_c的计算按Bazett’s公式:QT_c=QT(R-R)~(1/2)。凡QT_c值>440毫秒者,
Earlier studies have shown that unbalanced sympathetic innervation of the heart that prolongs the QT interval can increase arrhythmias in patients with coronary artery obstruction and decrease the threshold of ventricular fibrillation. This article aims to observe whether QT_c prolongation (> 440 ms) is associated with an increased incidence of sudden death in patients with myocardial infarction. Methods: The patients and matched control group of 55 cases. The patient group had a myocardial infarction from 2 months to 6 years ago. The QT interval of 5 beats per ECG was measured. QT_c was calculated according to Bazett’s formula: QT_c = QT (R-R) ~ (1/2). Where QT_c value> 440 milliseconds,