Here is a link to the Medtronic website information on things that may affect your Pacemaker:
http://www.medtronic.com/rhythms/dow...aws_online.pdf
Also, I remember one other time that my pacemaker "took a little time off" that caused me to sit down for a while until it recovered, that had no connection to welding. I was testing a DC motor and held the leads to the terminals of a 12V battery with my bare fingers. Apparently enough 12V current went through my arms and across my chest where the pacemaker is and I felt the heaviness in my chest and the difference in my breathing right away. It took sitting down for a few minutes to recover.
It is the stuff you don't think about that gets your attention!
