Berbari E J
Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City.
J Electrocardiol. 1987 Oct;20 Suppl:125-7.
High resolution ECG (HRECG) techniques have been used for several years to quantify low level cardiac potentials which occur at the end of and after the normal registration of the QRS complex. These potentials have been recorded with endocardial catheter electrodes in man and epicardial electrodes in canine models of myocardial infarction. In order to record these small signals on the body surface, signal averaging is used to improve the signal-to-noise ratio. These so-called "late potentials" have been the focus of a few animal studies and an ever increasing number of clinical studies. The primary focus of the clinical studies has been in the patients with inducible ventricular tachycardias. Long-term follow-up of patients with myocardial infarction has also been reported. There is continual support for the conclusion that the presence of late potentials, measured with a variety of approaches, is an independent measure of vulnerability to life-threatening ventricular arrhythmias. Methods used for recording and analyzing the late potentials have varied widely among investigators. Four aspects of these various studies will be examined: lead selection, signal processing, parameter selection, and quality control. Specific data with regard to lead selection and high pass filtering will be presented.
高分辨率心电图(HRECG)技术已应用多年,用于量化在QRS复合波正常记录结束时及之后出现的低水平心脏电位。这些电位已通过人体的心内膜导管电极和心肌梗死犬模型的心外膜电极进行记录。为了在体表记录这些小信号,采用信号平均来提高信噪比。这些所谓的“晚电位”一直是一些动物研究和越来越多临床研究的重点。临床研究的主要焦点是可诱发室性心动过速的患者。也有关于心肌梗死患者长期随访的报道。不断有证据支持这样的结论:采用多种方法测量的晚电位的存在是对危及生命的室性心律失常易感性的一项独立指标。不同研究者用于记录和分析晚电位的方法差异很大。将对这些不同研究的四个方面进行探讨:导联选择、信号处理、参数选择和质量控制。将给出关于导联选择和高通滤波的具体数据。