It's not likely, but if you're an expert I'm sure you could think of a few ways it would be possible. The reason we give people with pacemakers a list of machines to avoid is definitely not to waste their time because there is no possible way any of those things could be dangerous to them.
As an RF expert I can assure you that I could create a device to wirelessly interfere with a pacemaker. A pathological one, maybe, but the point remains: regulation is needed.
The question is whether such interference could be created by a device as a by-product of its normal operation, not by a weapon that's intended to cause harm.