I heard some medical podcast once- not sure where- maybe Patrick Timpone- the guest mentioned there used to be a whole hospital building somewhere in the Rustbelt area- that not only was devoted to Oxygen Therapy & had Hyperbaric Chambers- whole Floors & whole Wards- were sort of Hyperbolic Chamber with Extra Bariatric Pressure & Oxygen Pumped in.
Needless to say the PLACE was torn down.