Parastomal hernia after ileal conduit urinary diversion: re-visiting the predictors radiologically and according to patient-reported outcome measures

Abstract

Purpose To evaluate the predictors of post-ileal conduit (IC) parastomal hernia (PSH) based on a standard grading methodology and according to the patients reported outcome measures (PROM). Methods A prospective evaluation for patients with IC attending their scheduled follow-up was conducted between December 2013 and October 2015. The hernia stage was determined according to the European Hernia Society (EHS) classification as types I and II included defect size < 5 cm without and with a concomitant incisional hernia, respectively. Types III and IV included defect size > 5 cm without and with a concomitant incisional hernia (high-grade hernia). The evaluation was performed by a non-contrast CT scan. PROM were defined as symptomatic if there were hernia-related abdominal discomfort, appliance problems, and/or bowel complications. Perioperative parameters were modeled for prediction of high-grade and PROM outcomes. Results PSH was diagnosed in 138 (39.9%) patients, symptomatic in 119 (34.4%) and high-grade in 59 (17%). Independent predictors of radiologically diagnosed PSH were hypoalbuminemia (odds ratio [OR]: 1.7; 95% Confidence interval [CI]: 1.1–2.7; p = 0.02), localised disease (OR: 0.6; 95% CI: 0.3–0.9; p = 0.04) and negative lymphadenopathy (OR: 0.4; 95%CI: 0.2–0.8; p = 0.004). Predictors of symptomatic PSH were hypoalbuminemia (OR: 2; 95%CI: 1.2–2.3: p = 0.003) and previous hernia surgery (OR: 2.1; 95%CI: 1.1–4.2; p = 0.024). Conclusions Only a small proportion of patients with PSH were asymptomatic. Preoperative hypoalbuminemia was the most significant factor contributing to the development and symptomatizing of PSH. Previous hernia surgery further contributed to the patient complaint.