Lieutenant Theodore Demetriou, the medical officer with Black Sea Rotational Force 14, shows participants in a medical seminar an automated external defibrillator at Traian Placement Center in Constanta, Romania, Feb. 11, 2014. An AED is a portable electronic device that automatically diagnoses abnormal heart palpitations in a patient, and is able to treat them through the application of electrical therapy, or defibrillation.