For the benefit of anyone interested, I will pass on a quote from Boston Scientific's "Electromagnetic (EMI) Compatibility Table
for Pacemakers, Transvenous ICDs, S-ICDs and Heart Failure Devices" under Electric Toy Train. FYI, this is a 47-page compendium of devices; there are cautions about soldering guns also.
"Use precautions: Maintain at least a 6 inch (15 cm) separation between the transformer and the implanted device. Do not touch power rail, especially with wet hands."