Concurrent Chemoradiation Affects the Clinical Outcome of Small Bowel Complications Following Pelvic Irradiation: Prospective Observational Study from a Regional Cancer Center.

Background To appraise the spectrum of small bowel complications following pelvic irradiation and to assess the clinical outcome and factors associated with adverse clinical outcome in these patients. Methods This descriptive clinical study was done for three years in a tertiary care center in South India. Patients managed for post-irradiation small bowel complications, irrespective of the indication for radiotherapy, were studied. Patients with associated non-gastrointestinal radiation toxicity, radiation proctitis, and radiation colitis were excluded. The parameters assessed were the range of small bowel complications, a comparison of operative and non-operative management, morbidity and mortality, the severity of complications in relation to the dose of radiotherapy, and various factors influencing the clinical outcome. Results A total of 50 patients were studied. Stricture and perforation peritonitis were the most common presentation (n=25; 50%). A majority of the patients (n=37; 74%) presented after six months following radiotherapy. Post-operative mortality was 16% (n=5). Age, body mass index (BMI), previous surgery, operative intervention, primary or adjuvant radiotherapy, concurrent chemoradiotherapy (CCRT), and various radiation protocols were not associated with adverse clinical outcomes with respect to overall mortality, the requirement of surgery, and operative mortality. However patients who were operated and those who received CCRT had a significantly longer mean intensive care unit (ICU) stay (3.51 days vs. 0.68 days; p = 0.0001) as well as overall mean hospital stay (14.87 days vs. 5.58 days; p = 0.001) and an insignificant mortality rate (16% vs. 15%; p = 0.4085). Conclusion The present study observed that the patients who were operated and those who received CCRT had significantly longer hospitalization and relatively higher mortality. Considering the fact that many of the patients who develop post-irradiation complications may not report back to the same center, the incidence of small bowel complications could be higher in reality, which ascertains the necessity for more precision in the radiation technique and operative care in developing countries.