Patent Document ID: 8082036
Application ID: 12266441
Patent Flag: 1

Claim One:
1. An implantable medical device comprising: an implantable sensing electrode; a variable gain sense amplifier in communication with the sensing electrode so as to receive signals sensed therefrom; and a controller in communication with the sensing electrode via the variable gain amplifier wherein the controller is configured to: monitor the signals received from the sensing electrode; detect the occurrence of physiological processes based on the signals exceeding a programmable threshold value; and periodically perform an automatic sensing test; wherein to perform the sensing test the controller is configured to evaluate the sensed signals; characterize a pattern thereof; and if the pattern comprises a repetition of an irregular complex including at least two different individual complexes, then for each individual complex, iteratively temporarily reprogram sensing parameters to a more aggressive setting until undersensing of the individual complex occurs and establish an effective set of sensing parameters for the individual complex corresponding to the last set of sensing parameters for which undersensing of the individual complex did not occur.