I'm uncertain what to call the etiology of your patients arrest.
There are alot of questions I'd like to ask before making a stab at it.
You mentioned gurgling resps, lethargy, and sluggish pupils, all which
hint at an airway problem, and an underlying hypoxia.  I remember from
school that the majority of peidi arrests start out as resp arrests
first; the leading cause of a peidi arrest is respiratory compromise of
some kind.  As the other fellow mentioned, agressive airway management
is key to intervention.  You also asked about your defib, and the
protocols limiting you to larger patients.  those are in place for good
reasons.  With a little chest, there's far less trans thoracic
resistance to the defibrillation, and the excess electricity can cause
tissue damage.  Besides, the patient hadn't arrested until you had
already transferred patient care at the hospital.  At that point it was
the hospitals case.  So, consideration of your 'zapper' in this case is
moot.
     Hope this call didn't shake you up too much.  The worst call in the
world is pediatric arrest.  Hope you're not beating yourself up about
it.  This kinda stuff happens.
                             Carry on!
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