There really isn't any reason for concern. It is fine to have your blood pressure taken in either arm after a pacemaker has been inserted. The blood pressure readings will be accurate and the cuff pressure will not affect the pacemaker function.
However, devices that give out electromagnetic waves can affect the performance of a pacemaker. These devices include cell phones as well as antitheft devices, surveillance equipment, welding equipment and hospital machinery such as MRI scanners.
Here are some additional tips regarding your pacemaker:
Airport security systems will not harm your pacemaker, but your pacemaker might set off an alarm. Show security personnel your pacemaker card and ask to be scanned with a hand wand — except for the area of your pacemaker.
Do not linger near the anti-theft devices at the front of stores. The electromagnetic waves may trick your pacemaker into thinking your heart is beating using its natural pacemaker system.
To avoid potential interference from a cell phone, hold the phone on the opposite side of your body away from your pacemaker.
Always tell medical and dental personnel that you have a pacemaker. With proper precautions, many procedures and tests, including X-rays and mammograms, are unlikely to interfere with your pacemaker's operation.
You will not harm yourself or your pacemaker by standing next to a microwave oven.
