Cardiac stimulation methods and systems provide for multiple pulse
defibrillation, and involve sensing a fibrillation event, determining a
fibrillation cycle length associated with the fibrillation event, and
delivering a plurality of defibrillation pulses to treat the fibrillation
event. Defibrillation pulses are delivered using a combination of
subcutaneous non-intrathoracic electrodes. Delivery of each
defibrillation waveform subsequent to a first defibrillation waveform is
separated in time by a delay associated with the fibrillation cycle
length. Delays between defibrillation waveform delivery may be associated
with a percentage of the fibrillation cycle length.