Not enough to directly endanger people, but a hospital is full of electronics that plenty of people need to live, and it sounds like they could potentially share the iPhone’s vulnerability.
Hospitals of reasonable size typically have an on-site clinical engineering team that handles those kinds of situations. Important (that is, capital expense category) hospital equipment will typically emit all kinds of warnings and alarms way before anything's actually a problem, because everyone would rather rely on the on-site engineering spending a little extra time silencing false positives then leave anything to chance.
All the nursing journals are full of articles about combating “alarm fatigue”. After 1 google query and 2 minutes of link-clicking:
> “An analysis of alarms at The John Hopkins Hospital, Baltimore, Maryland, revealed a total of more than 59 000 alarm conditions over a 12-day period-or 350 alarms per patient per day.1,2”
If you spend any time in an emergency room or a hospital, you'll soon realize that there's almost always an alarm going off somewhere, usually more than one and usually for long periods of time.
It's not an issue for most equipment though because it's only really the MEMS type oscillator that is sensitive to this type of gas intrusion. It's a very new type of clock and most other devices don't use them so there's basically zero risk.
