Systems and methods for acquiring and analyzing electrograms in myocardial tissue

A system for acquiring and analyzing electrograms in myocardial tissue, comprising:

• a member supporting multiple electrodes in a three dimensional, radially expanded array adapted to be in operative association with a region of heart tissue;
• a first processing element including a pacing module and a signal processing module coupled to the multiple electrodes to acquire a sample of a cardiac event by placing the heart at a predetermined location while conditioning the multiple electrodes to sense paced electrograms occurring in the tissue region during pacing;
• and
• a second processing element including means for electronically comparing the sample to a template of a cardiac event of known diagnosis and generating an output based upon the comparison, whereby the output provides a diagnostic indicator based upon pacing.