(AED is the abbreviation of Automatic External Defibrillator. 1) This small and lightweight defibrillator is a special training device and can be easily carried. Before using the real clinical AED, the responder should have completed an appropriate responder training program, which may include the use of the AED Trainer.Having completed such a course,the responder should demonstrate a proficiency in assessing the patient for lack of responsiveness ,absence of breathing,and lack of circulation;.