Explosive proctitis: potential treatments and pitfalls in the treatment of chronic radiation proctitis

Abstract

A 73-year-old man presented to the authors' clinic with profuse rectal bleeding, defaecatory urgency and symptomatic anaemia. He had been treated for prostatic adenocarcinoma 12 months previously, with neoadjuvant hormones and radiotherapy (total dose of 60 Gy). Chronic radiation proctitis was confirmed endoscopically and histologically in the absence of any other left-sided colonic pathology. His initial medical management with sucralfate enemas and oral metronidazole failed. However, he withheld consent for further topical or endoscopic treatment despite continued symptomatic deterioration and transfusion dependency, presenting a therapeutic impasse. Oral thalidomide (75 mg/day) was started and he made an excellent symptomatic response and became transfusion independent. However, 23 days after starting thalidomide peripheral neuropathy ensued, a well documented side effect (Mileshkin and Prince, 2006), which resolved rapidly following its discontinuation. His symptoms and anaemia rapidly re-emerged and at this point he consented to endoscopic therapy with argon plasma coagulation. An unprepared flexible sigmoidoscopy, to the rectosigmoid junction, demonstrated features of chronic radiation proctitis and argon plasma coagulation was applied exclusively to the rectum. However, the patient developed sudden onset abdominal pain necessitating abandonment of the procedure. A chest radiograph showed free air under the right hemidiaphragm. An emergency laparotomy revealed multiple perforations and lacerations in the proximal descending colon without abdominal contamination. A Hartmann's procedure was performed. A direct perforation as a sequelae of the procedure is unlikely as multiple perforations and lacerations were evident proximal to the upper limit of the examination. Furthermore, no perforation was observed in the rectum or sigmoid where the argon plasma coagulation was applied. As bowel preparation was not administered before the flexible sigmoidoscopy and given the aforementioned findings at laparotomy, the likely cause of the perforation was an intracolonic gas explosion, a rare iatrogenic complication of using thermocoagulative endoscopic techniques within the colon. The patient died 16 days postoperatively of multiorgan failure.