Abstract: A portable defibrillator system includes a personal multifunction device and a portable defibrillator device for delivering a dose of electric current to a heart for ending the dysrhythmia and allowing the heart to re-establish a normal sinus rhythm. A portable defibrillator case contains defibrillation circuitry supporting the generation and transmission of a dose of electric current. A set of charging pads electrically connect to the portable defibrillator case for communication of the dose of electric current and sensing from the patient responses to said electric current. A first set of communication circuitry communicates between the defibrillation circuitry and a personal multifunction device. A second set of communication circuitry communicates between the defibrillation circuitry and the set of charging pads. The portable defibrillator case, set of charging pads, and first and second sets of communication circuitry are of a size similar to the size of the personal multifunction device.