I'm Dr Chaithanya, experienced Physician attending you.
The most common cause of the beep would be that the device is nearing the battery end.
It can be from 2 to 6months from the time your the beep the battery ends; it depends on the device and the company.
Second thing can be any problem with the lead in the device.
This is not an uncommon complaint among pacemaker wearers.\
Now, you need to consult a Device clinic or a person who is monitoring your wife's device for correct clarification and follow up
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