1. A method for use with an implantable medical device, the method comprising: sensing a cardiac signal within a patient in which the implantable medical device is implanted using a cardiac signal sensing system of the implantable medical device; detecting cardiac events of interest within the patient using an event detection system of the implantable medical device; recording portions of the cardiac signal, including portions representative of the events of interest; detecting a stable cardiac state of the patient by the implantable medical device; in response to detecting the stable cardiac state, initiating an off-line analysis of the recorded portions of the cardiac signal including portions representative of events of interest to identify false detections of events of interest, wherein the off-line analysis is performed by the implantable medical device concurrently with continued operation of the event detection system; and selectively adjusting one or both of the cardiac signal sensing system and the event detection system to reduce false detections of events of interest.