Hi
To be perfectly honest with you, I'n not sure exactly what you're talking about, but I assume it's to do with using 2.4ghz systems when you are wearing a pacemaker. I've had a look, and there doesn't seem to be a definitive yes or no on the subject, but that said, pacemakers don't suffer in our already WiFi saturated world, so I would guess there shouldn't be a problem, and besides, transmitters are bound to FCC laws which would include this. If this is the subject of the question, the best thing would be to ask your doctor or the company that manufacture the defib to be certain.