Patent ID: 7650182

Claim:
A system comprising: a primary cardiac signal sensing circuit operable to sense at least a first intrinsic cardiac signal, wherein the primary cardiac signal sensing circuit is configured to be coupled to a first and a second implantable electrode and has a first signal sensing sensitivity configured to detect bradycardia and a second higher sensitivity to simultaneously detect tachyarrhythmia; at least one secondary cardiac signal sensing circuit operable to sense at least a second intrinsic cardiac signal, wherein the secondary cardiac signal sensing circuit is configured to be coupled to at least a third implantable electrode different from the first and second electrode, has a higher signal sensing sensitivity than the primary sensing circuit, and is configured to detect ventricular tachycardia; and a controller circuit, coupled to the primary and secondary cardiac signal sensing circuits, the controller circuit operable to: detect tachyarrhythmia and bradycardia using the primary sensing circuit; detect tachyarrhythmia using the secondary sensing circuit; and deem the tachyarrhythmia valid if the controller circuit detects the tachyarrhythmia using both the primary and secondary sensing circuits.