Hyperbaric oxygen has been advocated in the treatment of many head and neck diseases. Reports of such treatments have described eustachian tube dysfunction as the only complication. A review of patients receiving hyperbaric oxygen for head and neck diseases at The Mount Sinai Medical Center revealed serious complications, which included seizure, stroke, and myocardial infarction. In addition, follow-up study of these patients demonstrated that 11 patients treated for radiation-induced necrosis had an undiagnosed recurrence of cancer.
Giebfried, Lawson, Biller, , , , , , (1986). Complications of hyperbaric oxygen in the treatment of head and neck disease. Otolaryngology–head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 1986 Apr;94(4):508-12. https://www.ncbi.nlm.nih.gov/pubmed/3086814