Ihara Zenichi, van Oosterom Adriaan, Hoekema Rudi
Signal Processing Institute, Swiss Federal Institute of Technology Lausanne (EPFL), Switzerland.
J Electrocardiol. 2006 Jul;39(3):290-7. doi: 10.1016/j.jelectrocard.2005.12.001. Epub 2006 Mar 9.
We aimed to study the involvement of atrial repolarization in body surface potentials.
Electrocardiograms of healthy subjects were recorded using a 64-lead system. The data analysis focused on the PQ intervals while devoting special attention to the low-amplitude signals during the PQ segment: the segment from the end of the P wave until onset QRS. The data were analyzed by inspecting body surface potential maps and the XYZ signals of the vectorcardiogram.
Standard P-wave features exhibited normal values. The local potential extremes were found at positions not sampled by the standard leads. The PQ segment was found to be not isoelectric, the time course of the potential distribution being very similar to that during the P wave but for a reversed polarity and about 3-fold lower magnitudes.
The results demonstrate a significant involvement of atrial repolarization during the PQ interval and essentially discordant "atrial T waves," suggesting a small dispersion of atrial action potential durations.
我们旨在研究心房复极在体表电位中的作用。
使用64导联系统记录健康受试者的心电图。数据分析聚焦于PQ间期，同时特别关注PQ段期间的低振幅信号：从P波结束到QRS波起始的时段。通过检查体表电位图和心电图的XYZ信号对数据进行分析。
标准P波特征显示正常数值。局部电位极值出现在标准导联未采样的位置。发现PQ段并非等电位，电位分布的时间进程与P波期间非常相似，但极性相反且幅度约低3倍。
结果表明心房复极在PQ间期有显著作用，且存在基本不一致的“心房T波”，提示心房动作电位持续时间存在小的离散。
