Signal averaging of ventricular late potentials using Holter recordings

Holter 24-h ECG tape recordings have been used to identify patients susceptible to ventricular arrhythmias. The authors record ventricular late potentials from an ambulatory ECG using the technique of signal averaging. To commence signal averaging, a trigger template and a time interval, relative to the fiducial point, from which to measure noise are visually selected. The trigger template is used to define the shaping filter, and the ECG data file is continuously deconvolved with the shaping filter. As beats are accepted into the signal average they are graphically displayed, and a record of individual beat noise estimates is made. The results demonstrate that with an enhanced signal-averaging technique it is technically feasible to obtain high-resolution ambulatory ECG recordings