I think he means "home invasion", not "the Russians are coming!"
OP, get some Tactical Walls.
Len, can they legally search the house for firearms if they respond to a heart attack, or do they need some kind of pretext, like they see a firearm on your couch etc?
Anything in plain view is fair game. They may also get away with searching for a Medic Alert card, wallet (assume it is on bureau in bedroom, not on person in kitchen/living room), etc. If they can articulate another reason for being where they are and they SEE something, it can and will be used against the person.