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The shape of the energy delivered is monophasic in the first generation of defibrillators and biphasic (polarity reversal during the shock) in those present. The advantage is they require less energy for defibrillation (less risk of skin burns and less theoretical risk of heart).

Separately, the implantable defibrillator, which, as its name suggests, is located on the patient as a pacemaker: it detects and automatically administers an electric shock in case of occurrence of ventricular arrhythmia serious.

Defibrillator Materials 2