Maybe it will, and maybe it won't affect the ECG. Either way, the potential is there to develop this into a 547 page thread on Pprune.
In the interests of conserving Danny's valuable band-width, may I offer the following suggestion to eliminate any possibility of interferance with the ECG......
Recommendation -
Remove the metal objects prior to the ECG.
Sorry if that was a bit complex!
Regards,
Old Smokey