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Q—T 间期可近似地反映心室去极化和复极化,也是心室综合性电活动的重要指标.近年来有资料表明:植物神经对 Q—T 间期有较大影响.当今临床上测量 Q—T 间期的方法是测量 QRS 波的起点到 T 波的终点,一般测量10个心动周期,取其平均值,称为 Q—Tm.该法常因 T 波在等电位线上没有明确的终点而造成人为的缩短或延长.1920年Bazett 注意到 Q—T 间期随心率变化而改变并提出心率校正公式,即 Q—Tc=Q—Tm/(R-R)~(1/2)(R—R 为10个 R—R 的平均).但 Bazett的方法只适用于心率在50～115次/分的病人,心率
Q-T interval can be approximately reflected ventricular depolarization and repolarization, is also an important indicator of ventricular synthesis of electrical activity in recent years, there are data show that: autonomic nervous system has a greater impact on the Q-T interval in the current clinical The method of measuring the Q-T interval is to measure the beginning of the QRS wave to the end of the T wave, generally measuring 10 cardiac cycles, whichever is the average, called Q-Tm. This method is often due to T wave in the equipotential line A clear end point caused by artificially shortened or extended in 1920 Bazett noted that the Q-T interval changes with changes in heart rate and heart rate correction formula, that Q-Tc = Q-Tm / (RR) (R-R is the average of 10 R-Rs.) However, Bazett’s method is only suitable for patients with a heart rate of 50 to 115 beats / min, heart rate