迟电位(Late Potentials)是出现在QRS波群终末与ST段的高频低幅值心脏电活动,它与心肌梗塞后室性心律失常的发生有密切关系。自1978年Berbari和Fontaine等报导采用计算机平均叠加技术从体表记录迟电位获得成功以来,迟电位的研究才明显深化。一、体表检测技术迟电位信号非常微弱,从心外膜直接记录时一般在1mV以下,从体表记录时为微伏数量级。由于骨骼肌活动、电极和放大器噪声及工频干扰的引入,即使在理想情况 Late Potentials are high-frequency, low-amplitude cardiac electrical activity occurring at the terminal and ST segments of QRS complex and are closely related to the occurrence of ventricular arrhythmias after myocardial infarction. Since 1978, Berbari and Fontaine et al reported using computer aided overlay technique from the body surface to record late potential success since the study of the late potential was significantly deepened. First, the body surface detection technology late potential signal is very weak, direct recording from the epicardium is generally below 1mV, when recorded from the surface of the micro-volts order of magnitude. Due to skeletal muscle activity, the introduction of electrodes and amplifier noise and power frequency interference, even in the ideal situation