Anderson K P, Lux R A, Dustman T
Division of Cardiology, University of Utah Medical Center, Salt Lake City, 84132.
Am Heart J. 1990 Jun;119(6):1302-11. doi: 10.1016/s0002-8703(05)80179-6.
We addressed the hypothesis that premature ventricular complexes (PVCs) and sustained ventricular tachycardia (VT) have identical QRS morphologies in 20 patients with recurrent sustained VT. Continuous six-lead ECGs of PVCs and sustained VT induced with programmed stimulation were recorded. A computer program divided the PVCs and VT beats of each patient into distinct morphologic groups and a representative waveform was obtained by averaging the PVC and VT beats of the group members. A correlation coefficient was then derived between the QRS complexes of each PVC and VT morphology. The mean number of PVC morphologies was 12 +/- 8 per patient (range 1 to 26), the mean number of VT morphologies was 2 +/- 1 per patient (range 1 to 5). The correlation coefficient between the dominant PVC morphology and a VT morphology was greater than 0.7 in only three patients. The combined percent contribution of all PVCs with morphologies that were at least possibly identical to those of VT averaged only 13%. Thus PVCs with morphologies identical to those of VT are present in some patients with sustained VT, but these constitute a small proportion of all PVCs.
在20例复发性持续性室性心动过速（VT）患者中，室性早搏（PVC）与持续性室性心动过速具有相同的QRS形态。记录了通过程控刺激诱发的PVC和持续性VT的连续六导联心电图。一个计算机程序将每位患者的PVC和VT搏动分为不同的形态学组，并通过对组成员的PVC和VT搏动进行平均获得一个代表性波形。然后得出每种PVC和VT形态的QRS波群之间的相关系数。每位患者PVC形态的平均数为12±8（范围1至26），每位患者VT形态的平均数为2±1（范围1至5）。仅在3例患者中，主要PVC形态与VT形态之间的相关系数大于0.7。形态至少可能与VT相同的所有PVC的综合贡献率平均仅为13%。因此，在一些持续性VT患者中存在与VT形态相同的PVC，但这些仅占所有PVC的一小部分。
