Capacitance

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Capacitance

During ventricular fibrillation, a common type of heart attack, the chambers of the heart fail to pump blood  because their muscle fibers randomly contract and relax. To save a victim of ventricular fibrillation, the heart muscle must be shocked to reestablish its normal rhythm. For that, 20 A of current must be sent through the chest cavity to transfer 200 J of electrical energy in about 2.0 ms. This requires about 100 kW of electric power. Such a   easily be met in  a hospitaL but  not by, say, the electrical system of an ambulance  arriving to help the victim.

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Capacitance