SYSTEM AND METHOD FOR AVOIDING UNDERSENSING OF VENTRICULAR FIBRILLATION

摘要

A medical device and associated method for detecting and treating tachyarrhythmias acquires a cardiac signal using electrodes coupled to a sensing module. Cardiac events are sensed from the cardiac signal and a processing module computes a first morphology metric for each sensed cardiac event occurring during a time segment of the cardiac signal. The first morphology metrics corresponding to an event originating in a ventricular chamber are counted. The first processing module computes a second morphology metric for the time segment of the cardiac signal in response to the count of the first morphology metrics meeting a threshold number of events. The time segment is classified as a shockable segment in response to the second morphology metric meeting a detection criterion.

主权项

1. A method for use in a medical device configured to detect and treat tachyarrhythmia, the method comprising:
determining a cardiac signal using a plurality of electrodes coupled to a sensing module; sensing cardiac events in response to the cardiac signal; determining a first morphology metric for each sensed cardiac event occurring during a time segment of the cardiac signal; determining a count of the first morphology metrics corresponding to an event originating in a ventricular chamber; determining a second morphology metric for the time segment of the cardiac signal in response to the count of the first morphology metrics meeting a threshold number of events; and classifying the time segment as a shockable segment in response to the second morphology metric meeting a detection criterion.