<unk> rillator with pad positions shown: the model is biphasic and either pad can be placed in each position The exact mechanism of<unk>  is not well understood. One theory is that successful<unk>  affects most of the heart, resulting in insufficient remaining heart muscle to continue the arrhythmia. Recent mathematical models of<unk>  are providing new insight into how cardiac tissue responds to a strong electrical shock.
Defibrillation
Cardioversion
Transcutaneous pacing
Transvenous pacing
Automated external defibrillator
Implantable cardioverter-defibrillator
Pacing 
Extracorporeal cardiopulmonary resuscitation