A novel apparatus and method for recording and replaying patient treatment and response data that occurs during the course of an emergency response on a defibrillator. The data and events of an emergency response may be recorded automatically by the defibrillator. Incidents may then be randomly accessible (i.e. "scrollable") by medical personnel on the defibrillator by placing the defibrillator into an incident review mode. The ability to quickly review critical ECG and event data on the scene. This provides medical personnel with a reliable and efficient alternative to paper based recording systems.