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本文回顾研究了５９例室性心动过速（ＶＴ）病人体表（１２）导联心电图上最大ＱＴ间期弥散度（ＱＴｄ）的变化，并与７２例没有ＶＴ的病人和４３例正常人ＱＴｄ比较。结果显示（１）ＶＴ病人ＱＴｄ７８±１７ｍｓ（ｐ＜０．０１），非ＶＴ病人３８±１０ｎｓ（ｐ＜０．０５），正常人对照组ＱＴｄ３５±７ｍｓ；（２）ＶＴ病人，ＥＦ值＞０．５时，ＱＴｄ为６４±１８ｍｓ，ＥＦ值＜０．５时，ＱＴｄ为９０±２２ｍｓ（ｐ＜０．００１）；（３）ＶＴ病人ＥＦ值与ＱＴｄ有相关性，ｒ＝－０．６１（ｐ＜０．０１）。因此我们认为ＱＴｄ增大，是心室复极不均、室性心律失常易感性的体表标志，心功能不全时ＱＴ增大。
In this paper, the changes of maximum QTd on the electrocardiogram of body surface (12) in 59 patients with ventricular tachycardia (VT) were retrospectively studied. QTd was compared with that of 72 patients without VT and 43 normal controls Compare The results showed that: (1) QTd78 ± 17ms in VT patients (p <0.01), 38 ± 10ns in non-VT patients (p <0.05), and QTd in normal controls35 ± 7ms; (2) QTd was 64 ± 18ms at 0.5 and QTd was 90 ± 22ms (p <0.001) with EF value <0.5; (3) EF was associated with QTd in VT patients, r = -0.61 (P <0.01). Therefore, we believe that QTd increases, is uneven ventricular repolarization, ventricular arrhythmia susceptibility of the body surface markers, QT increased cardiac insufficiency.