Use of hyperbaric oxygen therapy (HBOT) is safe and effective in patients with haemorrhagic cystitis induced by radiotherapy or chemotherapy that is not responding to conventional management, say researchers. Degener and co-workers performed a retrospective review of 15 patients with haemorrhagic cystitis who were referred for HBOT. At a median of 68 months after HBOT, 80% of patients showed complete resolution of haematuria and two patients had experienced a single new episode of minor haematuria. No adverse effects were noted.