Patent ID: 8750972

Claim:
An implantable medical device comprising: a plurality of electrodes; circuitry configured to arrange the plurality of electrodes in a first sensing configuration and a second sensing configuration; and a controller configured to: receive a first cardiac electrical activity signal from the first sensing configuration and a second cardiac electrical activity signal from the second sensing configuration; combine the first cardiac electrical activity signal and the second cardiac electrical activity signal in one or more ways to create corresponding one or more processed cardiac electrical activity signals; and evaluate the first cardiac electrical activity signal, the second cardiac electrical activity signal and the one or more processed cardiac electrical activity signals to select a corresponding one of the signals for subsequent processing of cardiac electrical activity; wherein each of the first cardiac electrical activity signal, the second cardiac electrical activity signal and the one or more processed cardiac electrical activity signals exhibits primary and secondary characteristics and the controller is configured to evaluate by being further configured to: calculate for each signal, a discrimination measure between the sensed amplitudes of their respective primary and secondary characteristics; and select the signal corresponding to the largest discrimination measure as the one that provides more inhibited oversensing; and wherein the controller is configured to calculate a discrimination measure by being further configured to calculate a mean, a corresponding standard deviation and a value of mean minus one standard deviation, for each signal.