I had treatment in a hyperbaric chamber for 24 times several years ago,. I had an infection in my big toe and they had me on an antibotiic IV and I had to come in 3 times a week in the beginning for 2 hours each time. The whole time I kept expecting a miracle for the RA- sorry to report for me-nothing.. I had always thought that it was an answer for us, because of the pressure and stuff, but nope - my toe healed fine because of the extra oxygen but nothing for the RA. Sorry for my lousy report. It might be just me. Hugs...