Patent ID: 8271073

Claim:
A method of discriminating cardiac events, comprising: sensing cardiac signals along a first sensing vector and a second sensing vector different from the first sensing vector; determining a first morphology match score corresponding to a first cardiac signal sensed along the first sensing vector; determining whether the first match score is within a first match zone having a first correlation with a non-treatable cardiac event, a second match zone having a second correlation with the non-treatable cardiac event less than the first correlation with the non-treatable event, a third match zone having a first correlation with a treatable cardiac event, and a fourth match zone having a second correlation with the treatable cardiac event greater than the first correlation with the treatable cardiac event; determining, in response to the first match score being within one of the first match zone and the second match zone, whether consecutive match scores are within the first match zone; determining whether a break in the treatable cardiac event has occurred in response to determining whether consecutive match scores are within the first match zone; accumulating cardiac event evidence in response to determining whether a break in the treatable cardiac event has occurred; and discriminating cardiac events in response to the accumulated cardiac event evidence.