is not a doctor, but he did undergo a year of paramedic training, so take this for what it is......first of all, SWIM highly doubts poppers
would help save anyone in a cardiac emergency, but, he does know that they do lower blood pressure significantly (hence much of their effects).......the first line of defense in an overdose situation is to call an ambulance. Not the pigs, an ambulance, and get rid of any drugs
in the area (preferably get the person outdoors so there is no house to search, SWIY can always claim they came across a person in the street in this condition etc). One thing that will help a cardiac victim (note this is not to be done in place of medical help, but while waiting for it). Give them asprin, have them chew and swallow, it will thin the blood, lower BP etc. SWIM doesn't see how the bp-lowering effects of poppers could hurt in this situation, but he isn't sure of other effects, and it would be a hell of a thing to explain to medical personnel.........anyone else want to take the rest of this question?
SWIM thinks in an emergency situation where medical help is not possible (camping with no cell phone or car etc), the poppers might help, but situations where help is truly unreachable are rare these days.