1. A processing element for analyzing biopotentials in myocardial tissue comprising first means for inputting an input template of a cardiac event of known diagnosis, the input template comprising a plot of biopotentials over time and not a spacial distribution of endocardial surface activation, second means for inputting an input sample of a paced cardiac event, the input sample comprising a plot of biopotentials over time and not a spacial distribution of endocardial surface activation, and third means for electronically comparing the input sample to the input template and generating an output based upon the comparison, whereby the output provides a diagnostic indicator.