ABSTRACT
Defibrillators are devices used to restore normal cardiac rhythm by delivering a burst of electrical energy to the heart. This ‘burst’ depolarises all the myocytes essentially re-setting the electrical status of the heart and allowing co-ordinated myocardial depolarisation to occur again. There are various types that can be manual or automated, monophasic or biphasic, external, transvenous or implanted in the patient.
