Signal averaged electrocardiograms-a comparative study of two recording devices

Signal averaged electrocardiograms (SAECGs) were studied with the Corazonix Predictor and the Marquette MAC 12/15 in a group of 27 patients. The two devices agreed on the interpretation of the SAECG in 81.5% of the patients. The sensitivity, specificity, and predictive value for these devices in predicting sustained monomorphic ventricular tachycardia are fairly good and comparable with values in the literature. Different methodologies and different criteria for an abnormal SAECG account in large part for the great range of predictive values reported in the literature