Song Y C
Fu Wai Hospital, Chinese Academy of Medical Sciences, Beijing.
Zhonghua Xin Xue Guan Bing Za Zhi. 1992 Dec;20(6):349-51, 389.
Ten patients with long QT syndromes (LQTs) and torsade de pointes (Tdp) were evaluated. The following features were noticed: (1) Serum potassium concentration was reduced in 5 of 10 patients (50.0%, mean value 3.0 mmol/L); (2) The QT interval (mean value 0.50s) was significantly prolonged in all patients; (3) A flat and wide T wave, an abnormal increase in U wave amplitude close to the end or the peak of the T wave and these changes were accentuated by pause or a sudden deceleration in ventricular rhythm; (4) The critical beat of Tdp inevitably started after the peak of the T wave of a markedly prolonged QT interval. Cycle lengths preceding torsade de pointes were shown in a pattern of short cycle-long QT-"late premature ventricular contraction" initiating sequence changes.
对10例长QT综合征（LQTs）合并尖端扭转型室性心动过速（Tdp）患者进行了评估。发现以下特征：（1）10例患者中有5例（50.0%）血清钾浓度降低（平均值3.0 mmol/L）；（2）所有患者的QT间期（平均值0.50秒）均显著延长；（3）T波低平且增宽，T波终末或顶峰附近U波振幅异常增高，这些改变在长间歇或心室率突然减慢时加重；（4）Tdp的关键搏动不可避免地在QT间期显著延长的T波顶峰之后开始。尖端扭转型室性心动过速之前的心动周期长度呈短周期 - 长QT - “晚发性室性早搏”起始序列变化的模式。
