Abstract
In this study it is demonstrated that, for defibrillation with a rectangular pulse, the relationship between threshold current strength and pulse width can be approximated by a hyperbola. Also the threshold charge and energy required for effective defibrillation are presented as functions of the pulse duration. From these three curves it can be seen that, for a rectangular pulse, the current strength is minimal for a duration between 20 and 40 ms, the charge, for a ‘zero’ duration and the energy for a duration of around 4 ms. Myocardial performance is generally assumed to be, minimally disturbed after a defibrillation shock if the applied current, charge and energy of one pulse are all minimal. Then it can be concluded that, for a rectangular pulse, no duration can be advised for defibrillation with the least myocardial disturbance after the shock, since current, charge, and energy have their minimums at different, pulse durations.
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