From what I have read, he can probably do anything, as long as he does not work with high frequency communications equipment, work where there are very strong magnetic fields, and work in very high voltage fields. I also read that it is advisable to not put a cell phone too close to it, and not to go very close to a microwave oven.
If he enquires to the manufacture of the pacemaker, they can advise him officially. This would be the best action I would take.
I have had an ELA brand pacemaker for about 2 years now, and I routinely use my amateur radio 144 (50W) and 440 (35W) MHz transceiver in the car, with the antenna on the trunk lid. A friend measured the field strength at my driver's seat and found that it was about 5% of the recommended maximum field strength for human exposure (the only calibration on his instrument).
I routinely do household wiring projects, and I work as an electrical engineer. I have never had cause to worry about the operation of the device. Kudo's to ELA. :-)
I do listen to the warning that magnets should be avoided, and I don't go through the metal detector at the airports. The pacer technician has demonstrated to me that the device is turned off by magnetic fields, which he uses when it is necessary to monitor my natural heartbeat.
As far as asking the doctor, you will be surprised at how little technical information the doctor knows. As far as the device is concerned, the doctor is little more than a sales agent. This is not surprising since his field is medicine, not electronics. You might as well discuss field strength and electromagnetic susceptibility with a grocery store clerk.
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