Patent ID: 7907993

Claim:
A method of detecting a cardiac event of a cardiac signal generated by a heart of a patient with a medical device having a plurality of electrodes forming a first sensing vector and a second sensing vector, comprising the steps of: sensing data representative of the cardiac signal with the plurality of electrodes; determining a first heart rate estimate associated with data representative of the cardiac signal sensed from the first sensing vector and a second heart rate estimate associated with data representative of the cardiac signal sensed from the second sensing vector, wherein the data representative of the cardiac signal sensed from the first sensing vector is sensed, at least in part, concurrently with the data representative of the cardiac signal sensed from the second sensing vector, the first heart rate estimate and the second heart rate estimate being based, at least in part, on a metric of heart rate; determining a reliability for each of the first heart rate estimate and the second heart rate estimate; delivering a therapy to the patient if: only one of the first heart rate estimate and the second heart rate estimate is reliable and the reliable one of the first heart rate estimate and the second heart rate estimate is greater than a predetermined heart rate threshold; or both of the first heart rate estimate and the second heart rate estimate are reliable and the first heart rate estimate is not equal to the second heart rate estimate and the first heart rate estimate and the second heart rate estimate exceed the predetermined heart rate threshold.