To review the results of Hyperbaric Oxygen therapy (HBOT) on the symptoms of interstitial cystitis (IC). To determine if there is greater symptom improvement in the ulcerative vs the non-ulcerative patients with interstitial cystitis.

There are multiple published studies outside of the United States on HBOT for treatment of interstitial cystitis. None of these studies compares ulcerative IC and non-ulcerative IC.

Inclusion Criteria:

• Interstitial cystitis.
• Urinary frequency of at least 8 times per 24 hours period.
• Patients with ulcerative IC must have undergone previous biopsy negative for cancer.
• Patients must agree to not begin any additional treatment for IC until study completion.

Exclusion Criteria:

• Absolute or relative contraindication to hyperbaric oxygen treatment.
• Patients dependent on intermittent catheterization or indwelling catheter to empty bladder.
• Any imminent change in residence, which could compromise compliance.
• Unlikely to be compliant due to unmanaged medical or psychological problems.
• Severe debilitating concurrent medical conditions.
• A history of pelvic radiation, bladder stone, bladder cancer or cancer in situ, or urethral cancer.
• Precious bladder or neurologic surgery which has affected bladder function.
• Currently has an active urethral stone, ureteral stone or urethral diverticulum.
• Subject misses more than 10 treatments.
• Severe claustrophobia.

1 year

A small number of patients were enrolled and treated (n=8), with only 5 patients completing the entire study. Three patients withdrew within the year following HBOT and were considered non-responders.