System and method for accurately detecting cardiac events using multi-threshold processing

摘要

A system and method provide precise detection of the time of occurrence of a cardiac event of a heart. The method comprises the steps of sensing electrical activity of the heart to generate an electrogram of the heart and applying the electrogram to an event detector having a plurality of spaced apart thresholds. The thresholds are selected such that the electrogram has an amplitude for crossing at least one of the thresholds. The method further comprises determining a characteristic identifying feature of the electrogram at each threshold crossing of the electrogram, comparing the determined characteristic identifying features to an electrogram template, and identifying the time of occurrence of the cardiac event based upon the comparison.

主权项

1. A method of detecting the time of occurrence of a cardiac event of a heart, the method comprising:
sensing electrical activity of the heart to generate an electrogram of the heart; applying the electrogram to an event detector having a plurality of thresholds, the electrogram having an amplitude for crossing a plurality of the thresholds; determining a characteristic identifying feature of the electrogram at each of the plurality of threshold crossings of the electrogram; comparing the determined characteristic identifying features to an electrogram template for each of the plurality of threshold crossings; and identifying the time of occurrence of the cardiac event based upon the comparison.