It's worse than that. The patient is forced by the compressions to vomit. In zero-G, that means the highly acidic contents of their stomachs are now several forcefully-ejected packets of goo.

Forget the dreaded conductive pencil-lead shavings; that stuff is going to cause problems to hardware and wetware alike!

Good point, also rather extreme aspiration risk probably? I don’t know how you would clear their airway unless you also had a suction device. Gravity certainly isn’t going to help.