Key result
Orthogonal shocks separated by a 100 ms delay reduced the energy required for defibrillation by 64% (101.4 vs 286.8 joules) compared to classical unidirectional shocks in dogs.
Effect estimate: 64% reduction
Absolute Event Rate: 101.4% vs 286.8%
Does not alter current defibrillation practice; leaves open translation of delayed orthogonal shocks to human use.
Reduction of energy required to defibrillate (ERD) seems to represent a necessary condition for intensive development of implantable defibrillator, so as for minimization of cardiac and pulmonary damages provoked by high energy transthoracic defibrillation electric shocks. The present work describes a defibrillation method using shocks delivered in orthogonal directions and separated by a 100 ms delay. Defibrillation threshold measured with classical unidirectional shocks on 30 dogs has been found to be 286.8 +/- 22.2 joules. In the same animals, defibrillation threshold measured by use of orthogonal shocks has been found to be 101.4 +/- 14.9 joules. We conclude that this crossed shocks method leads to a substantial reduction of ERD (64%).
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Bardou et al. (1988) studied this question. Shocks delivered in orthogonal directions separated by a 100 ms delay vs. Classical unidirectional shocks was evaluated on Defibrillation threshold (energy required to defibrillate) (64% reduction). Orthogonal shocks separated by a 100 ms delay reduced the energy required for defibrillation by 64% (101.4 vs 286.8 joules) compared to classical unidirectional shocks in dogs.