Patent ID: 8712524

Claim:
A cardiac rhythm management device, comprising: one or more sensing amplifiers for connecting to intra-cardiac electrodes to form sensing channels for generating intra-cardiac electrogram signals; a sensing amplifier for connecting to a subcutaneous electrode to form a subcutaneous ECG channel for generating a subcutaneous ECG signal; a pulse generator for connecting to an electrode and pacing a cardiac chamber; a controller for receiving sensing signals and controlling the delivery of pacing pulses in accordance with a programmed mode; and, wherein the controller is programmed to detect chamber senses in the subcutaneous ECG and an intra-cardiac electrogram signal, cross-check the chamber senses detected in the subcutaneous ECG signal and the intra-cardiac electrogram signal, and set an alarm flag if it is determined that a chamber sense is detected in one signal but not the other.