defibrillator

defibrillator

1. Monophasic

2. Biphasic

   • Biphasic waveforms deliver current that flows in a positive direction for a specified duration before reversing to a negative direction for the remainder of the electrical discharge
   • BTE
     • biphasic  truncated exponential
   • RLB
     • Rectilinear biphasic

3. shock energy and waveforms

   • Optimal energy level unknown
     • trance myocardial current flow achieves the defibrillation.  Current correlates well with successful defibrillation.   Transthoracic current during defibrillation is in the range 15 to 20 amp for approximately 10 ms
     • historically defibrillators developed in one phase it current,, one direction.   They have been superseded by biphasic defibrillators.
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