Hey Ed, I know you have a hard time with health stuff. That makes you more of an expert than most of us.
I also know the certificate requirements of health appliances (let's call 'm that). It is hardly likely that a power surge (ignition pulse spike) would cause damage like deregulation/reprogramming on heart monitoring apparatus, inside or outside the body. It is too easy to design hardware that absorbs this kind of low power abuse. I know of high power high frequency abuse that indeed would kill patients. Believe me.
I also know from experience how the low power HF radiation can upset electronic appliancies like battery chargers. But these do not have to pass the very very stringent medical requirements.