●A manual machine which necessitates the presence of certified physician to diagnose and interpret the rhythm and properly use the defibrillator to shock the patient. It has two modes of delivering the shock: asynchronized defibrillation and synchronized cardioversion
●AED has been introduced as an effective DC. It has only a synchronized mode of shock which allows paramedics, first responders, public at large trained, equipped with and authorized to use such a device in pre- hospital setting.