Hyperbaric medicine is extremely valuable therapy where appropriate, but it will disappoint alot of folks who have unreal or uneducated expectations, as breathing oxygen under pressure is not a magic moveup or cure-all for everything that ails you (remember reports of Michael Jackson sleeping in his personal chamber every night?)
The Horse website has alot of good articles on hyperbaric medicine use in equines, and here's our (unfinished) website: Veterinary Hyperbaric Medicine Society
http://www.vet.utk.edu/vhms/review.html