Two cases of Bacillus Calmette-Guérin cystitis treated with hyperbaric oxygen.

Hyperbaric oxygen (HBO2) therapy is a UHMS-approved treatment for radiation cystitis and has been used for other causes of cystitis such as cyclophosphamide-induced hemorrhagic cystitis and interstitial cystitis, among others. Immunotherapy with Bacillus Calmette-Guérin (BCG) is the most effective treatment of non-muscle invasive bladder cancer. BCG acts as a non-specific stimulant of the reticuloendothelial system, causing a local inflammatory response. BCG attaches to bladder tumor cells as well as urothelial cells which then stimulates an immune response involving a multitude of cytokines and local migration of polymorphonuclear cells that leads to death of the cancer cells. The typical protocol of a single six-week course has been shown to provide long-term protection from tumor recurrence and to reduce disease progression. Irritative bladder side effects are common, but serious side effects are uncommon. Two cases of severe BCG-cystitis treated with HBO2 are presented. Two male patients with bladder cancer were treated with intravesicular BCG. Each developed complications of pain, spasms, urinary frequency and nocturia; one developed gross hematuria. Cystoscopy showed friable mucosa. They failed standard medical therapy and were referred for HBO2. They were treated in a multiplace chamber at 2.2-2.4 ATA. One patient received 60 and the other 40 treatments. Both experienced substantial reduction in their symptoms. BCG cystitis may be considered for HBO2 if other standard therapy has failed.