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Q—T间期代表心室电收缩期,它包括心室的除极与复极但重点在复极阶段。Q—T间期的改变特别是其延长可见于多种病理因素,因此正确测量及计算Q—T数据对心肌疾病的诊断及治疗有重要指导意义。今将有关测算方法综述如下: (一)实测Q—T值:测量时应选择Q—T起止点清楚的导联如标准导联及加压肢体导联,致于胸导联因受U波影响常使T波终点不易明确,测量从Q波起点开始至T波终点止,由于Q—T间期随心率快慢而改变故应测三个间期求其平均值以后查阅正常值表以对照。(二)K值:Bajett氏根据正常人心动周期为一秒时统计出其Q—T正常值为0.39±0.04秒,取其中间值0.39做为收缩期指数以做计算
The Q-T interval represents ventricular systole, which includes the ventricular depolarization and repolarization but focuses on the repolarization phase. Q-T interval changes, especially the extension can be found in a variety of pathological factors, so the correct measurement and calculation of Q-T data for the diagnosis and treatment of myocardial disease has important guiding significance. The measurement methods will now be summarized as follows: (A) of the measured Q-T value: measurement should be selected Q-T start and end clear lead such as standard lead and pressure limb leads to chest lead due to U wave Often make the end of the T wave is not easy to determine the impact of measurement from the beginning of Q-wave until the end of the T wave, due to the Q-T interval with the rate of change of heart rate should be measured three intervals to find the average value of the table after the normal reference . (B) K value: Bajett according to the normal person’s cardiac cycle of one second statistics Q-T normal value of 0.39 ± 0.04 seconds, whichever is the median of 0.39 as the systolic index to be calculated