Abstract: An event-driven medical treatment data notification system is disclosed. Embodiments are directed to a system for transmitting medical treatment data, such as AED device events, waveforms, and device location information, to recipients that have registered to receive the data. In specific embodiments, the data is recorded by medical devices in the course of treatment during a medical incident. In specific embodiments, recipients register to receive treatment data in response to certain events. The treatment data is transmitted to any registered recipients in response to the occurrence of certain events.