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1 对象与方法 1.1 对象 选择1996年1月至1998年1月入院的资料完整的急性心肌梗塞(AMI)患者40例,其中男36例,女4例,平均年龄(63.11±11.86)岁。无电解质紊乱,无心房颤动或扑动;未使用影响心肌复极的药物。对照组40例,无心血管疾病,性别、年龄与AMI组差异无显著性。 1.2 方法 对照组静息休息10分钟后,做常规12导联心电图。AMI组选用入院后首次心电图除常规12导联外,必要时加做右胸或V_6～V_8导联。记录纸速为25mm/s。QT间期测量从QRS波群第一波折起点至T波终点。如存在U波,QT间期测量到T波和U波间弧线的最低点。各导联连测3个,取其均值。不论何导联从最长QT间期(QTmax),减去最短QT间期(QTmin)即得QTd。校正QT间期(QTc)=QT/√R-RQTcd导联心电图QTcmax与QTcmin之差。为减少测量误差,AMI组和对照组的全部心电图由一人测量。 1.3 统计学处理 数据以x±s表示,组间比较采用t检验。
1 Subjects and methods 1.1 Object Selection January 1996 to January 1998 hospitalized data of 40 patients with complete acute myocardial infarction (AMI), including 36 males and 4 females, mean age (63.11 ± 11.86) years old. No electrolyte disturbance, no atrial fibrillation or flutter; did not use drugs that affect myocardial repolarization. Control group 40 cases, no cardiovascular disease, gender, age and AMI group no significant difference. 1.2 Methods Control group resting for 10 minutes, do conventional 12-lead ECG. AMI group admission after admission for the first time in addition to conventional ECG 12 leads, if necessary, add right chest or V_6 ~ V_8 lead. Recording paper speed 25mm / s. QT interval measurements from the QRS complex first wave fold to the T wave end point. If there is U wave, the QT interval measures the lowest point between T wave and U wave. Each lead with test 3, whichever is the average. No matter what lead from the longest QT interval (QTmax), minus the shortest QT interval (QTmin) QTd. Correct QT interval (QTc) = difference between QTcmax and QTcmin of QT / √R-RQTcd lead ECG. To reduce the measurement error, the total electrocardiogram in the AMI group and the control group was measured by one person. 1.3 Statistical data to x ± s said that the comparison between groups using t test.