Earlier this month, Heart Rhythm Society conducted a medical study that seemed to suggest that iPhone 12 and MagSafe accessories could interfere with medical devices, like defibrillators and pacemakers. More recently, Apple has also updated its support documentation regarding this matter.
Matters of heart
Since MagSafe tech is complimentary with the iPhone 12, there’s plenty of magnet use, as the name would suggest. Apple never denied rumours that its latest flagship phone could affect medical devices in close proximity. What they did say is that the increased amount of magnets “are not expected to present a greater risk of magnetic interference with medical devices than previous iPhone models.”

What’s new then?
As mentioned, recently Apple updated their documentation, stating that to be entirely safe, keep your iPhone 12 and MagSafe accessories more than 30cm away if charging, and 15cm if they’re not. For the record, both MagSafe and MagSafe Duo are mentioned, since their “magnets and electromagnetic fields might interfere with medical devices.”
Of course, like with most things, if you’ve got any doubts, consult your physician and your medical device manufacturer too. Just to be on the safe side.