Multiple pulse defibrillation using angular electrode leads was studied as opposed to single shock defibrillation. After an experimental series in dogs and by comparison with previously reported results using single pulses. it was found that the latter requires high current levels potentially harmful to the myocardium. Multiple shocks appear as valid alternative to decrease voltage. current, and power. Energy is distributed over a longer time and, thus, its effects are minimized. Besides, with multiple shocks, power is drastically reduced. The search to reduce the electrical parameters in implantable defibrillators should be oriented toward a decrease in power rather than in energy. Impedance measurements of the defibrillatory path are useful to dose the shock and so avoiding excessive currents.

Multiple pulse defibrillation using angular electrode leads was studied as opposed to single shock defibrillation. After an experimental series in dogs and by comparison with previously reported results using single pulses. it was found that the latter requires high current levels potentially harmful to the myocardium. Multiple shocks appear as valid alternative to decrease voltage. current, and power. Energy is distributed over a longer time and, thus, its effects are minimized. Besides, with multiple shocks, power is drastically reduced. The search to reduce the electrical parameters in implantable defibrillators should be oriented toward a decrease in power rather than in energy. Impedance measurements of the defibrillatory path are useful to dose the shock and so avoiding excessive currents.