VENTRICULAR FAR FIELD REDUCTION

摘要

Far field reduction is carried out in a cardiac electrogram by extracting unipolar beats (48) of an intracardiac electrogram that occur within a predetermined time interval that includes QRS peaks, constructing a first mean unipolar beat by averaging the extracted unipolar beats (54), and accepting unipolar beats that cross-correlate with the first mean unipolar beat (56). A second mean unipolar beat is constructed from the accepted unipolar beats (66). A ventricular far field component is determined from the extracted unipolar beats (70) and subtracted from the intracardiac electrogram to distinguish a local component of the intracardiac electrogram.