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在实践中经常要根据心率去校正Q-T间期,从而得出“校正Q-T”(Q-T指数或K值)。一般采用Bazett于1920年设计的通过R-R间期来进行校正Q-T的计算(校正Q-T=实测Q-T/(R-R)~(1/2))。不过,在儿童中存在显著的窦性心律不齐时常使这种计算复杂化。众所周知,休息时R-R间期即使有变化Q-T间期也不会有明显改变。作者在常规心电图中搜集了42例显著窦性心律不齐的病例。在观察中选用Ⅱ导联。测量的周期自4-10个不等。发现尽管个别的R-R间期平均差值大至0.32秒,实测Q-T仍相对稳定,其差值<0.01秒。但在个别心动周期中“校正Q-T”显示
In practice it is often necessary to correct the Q-T interval based on the heart rate to arrive at a “corrected Q-T” (Q-T index or K value). The calibration of Q-T is generally performed using the R-R interval designed by Bazett in 1920 (corrected Q-T = measured Q-T / (R-R) ~ (1/2)). However, the existence of significant sinus arrhythmia in children often complicates this calculation. It is well known that there is no significant change in the Q-T interval even when there is a change in the R-R interval at rest. The authors collected 42 cases of significant sinus arrhythmia in the conventional ECG. In the observation of the choice of Ⅱ leads. The period of measurement varies from 4-10. It was found that although the average difference between individual R-R intervals was as large as 0.32 seconds, the measured Q-T was still relatively stable with a difference of <0.01 seconds. However, “Correction Q-T” is displayed during individual cardiac cycles