You ask me, I'm back to the same thing I posted to the topic of a snake bite kit that works:



If you're in full on cardiac arrest in the backcountry, as mentioned, there are worse places to die. Failing that, press the button, take an asprin, stay calm and wait for professional help to fly in.

No I'm not condoning hiking back into the boonies if you are at high risk. but in all seriousness you're probably better off with that than you are just about anything else you can carry.