An implantable medical device that includes a microprocessor that characterizes cardiac activity of a patient to enable the implantable medical device to deliver therapy in response to an identified arrhythmia event. A monitor/controller monitors the characterized cardiac activity and the delivered therapy,...http://www.google.com.au/patents/US7076298?utm_source=gb-gplus-sharePatent US7076298 - Method and apparatus for prevention of arrhythmia clusters using overdrive pacing
