The electrical parameter most directly related to defibrillation is shock voltage (or voltage gradient) as a function of time. The parameter most directly related to the size of an ICD pulse generator is stored energy. The characteristics of an ICD's capacitive-discharge waveform link the electrical parameters related to physiology to those related to engineering. A simple RC network model has proved useful for designing efficient, biphasic capacitive-discharge waveforms. The right ventricular electrode should be the anode for phase one of transvenous defibrillation waveforms. Guidance can now be given for the optimal usage of the SVC coil.

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