Method and apparatus for identifying oversensing using far-field intracardiac electrograms and marker channels

摘要

A method for identifying oversensing in implantable medical devices (IMDs), such as implantable cardioverter defibrillators (ICDs), is described. A near-field electrogram signal and a far-field electrogram signal are obtained via a near-field electrode pair and a far-field electrode pair. The near-field electrogram signal is compared to the far-field electrogram signal and a determination of whether oversensing exists is made based on the comparison. In some instances, a scheduled therapy is withheld in response to determining that oversensing exists.

主权项

1. An implantable medical system comprising:
at least one implantable lead that includes a plurality of electrodes; an implantable medical device coupled to the at least one implantable lead, the implantable medical device including:
a memory configured to store a near-field electrogram signal and a far-field electrogam signal; anda microprocessor configured to obtain the near-field electrogram signal, analyze the near-field electrogram signal to detect sense events in the near-field electrogram signal, obtain the far-field electrogram signal, analyze the far-field electrogram signal to detect sense events in the far-field electrogram signal, map each detected sense event in the far-field electrogram signal to a corresponding detected sense event in the near-field electrogram signal, determine that oversensing exists when a first predetermined number of detected sense events in the near-field electrogram signal that are not mapped to corresponding detected sense events in the far-field electrogram signal occur within a second predetermined number of detected sense events in the near-field electrogram signal that are mapped to corresponding detected sense events in the far-field electrogram signal.