Methods and devices for accurately classifying cardiac activity

摘要

Methods, systems, and devices for signal analysis in an implanted cardiac monitoring and treatment device such as an implantable cardioverter defibrillator. In some examples, captured data including detected events is analyzed to identify likely overdetection of cardiac events. In some illustrative examples, when overdetection is identified, data may be modified to correct for overdetection, to reduce the impact of overdetection, or to ignore overdetected data. Several examples emphasize the use of morphology analysis using correlation to static templates and/or inter-event correlation analysis.

主权项

1. A method of operation in an implantable cardiac stimulus (ICS) system comprising a canister housing operational circuitry for the ICS system, the canister having a canister electrode disposed thereon, and a lead having at least a first lead electrode disposed thereon, the canister electrode and the first lead electrode electrically coupled to the operational circuitry; the method comprising:
detecting electrical events occurring within the patient; constructing event representations for the detected electrical events; for a set of events N, N-1, N-2 and N-3, comparing the Nth event to each of the N-1, N-2 and N-3 events by correlation analysis; determining, using the results of the correlation analysis, whether the set of events indicates one of the following:
overdetection,benign cardiac rhythm, orlikely cardiac arrhythmia; and if likely cardiac arrhythmia is identified, determining whether stimulus is needed; and if stimulus is needed, delivering electrical stimulus to the patient from the ICS system; wherein overdetection is identified if the correlation analysis indicates a pattern of correlations between the events N, N-1, N-2 and N-3 that corresponds to overdetection.