An<unk>  <unk>  is a portable electronic device that automatically diagnoses the life-threatening cardiac arrhythmias of ventricular fibrillation (VF) and pulseless ventricular tachycardia, and is able to treat them through defibrillation, the application of electricity which stops the arrhythmia, allowing the heart to re-establish an effective rhythm. With simple audio and visual commands,<unk> s are designed to be simple to use for the layperson, and the use of<unk> s is taught in many first aid, certified first responder, and basic life support (BLS) level cardiopulmonary resuscitation (CPR) classes. The portable version of the defibrillator was invented in the mid-1960s by Frank Pantridge in Belfast, Northern Ireland and the first automatic, public use, defibrillator was produced by the Cardiac Resussitation Company in the late-1970s. The unit was launched under the name Heart-Aid.
Automated external defibrillator
Transcutaneous pacing
Transvenous pacing
Cardiac pacemaker
Defibrillation
Pacing 
Biological pacemaker
Implantable cardioverter-defibrillator