I think the pacemaker dangers are overated. have no ideas about the defibrilators. I have had pacemaker since 1979. Only time I ever had it trigger from elecromagantic field (excepting when being tested) was when I was standing beside an induction furnace, we had a melted cone of aluminum that looked like the scoop of ice cream you use in a ice cream cone, but it was about two feet across. heat was stricktly from induction coil, the cone squirmed and boiled. lots of power and I was very near. I could feel that one and had to back off. no one else noticed, a very minor thing. Intermedics says don't even ride a lawn mower (in their book that you get with a pace maker). The local rep says there is no documented case where the pace maker has been afffected. I can make it trip by holding a DC welding lead on it and stiking an arc. so i guess you dont want to lay on the cable, nor as mentioned above, wrap it around you.
BTW, never had a heart attack, heart muscle is in good shape.