The Impact of Prior Radiation Therapy on Artificial Urinary Sphincter Device Survival

Abstract

The literature on artificial urinary sphincter device survival in individuals with a history of radiation therapy is conflicting. We assess device survival outcomes among individuals after prior radiation therapy exposure undergoing primary artificial urinary sphincter placement. An institutional review board approved database of allpatients who underwent artificial urinary sphincter surgery from 1999 to 2011 was used to assess device survival in patients treated with radiotherapy compared to individuals without radiotherapy exposure. Hazard regression and competing risk analysis were used to determine the association between radiation therapy and device outcomes. From 1999 to 2011 a total of 872 patients underwent artificial urinary sphincter surgery at our institution. Of these patients 489 underwent primary artificial urinary sphincter placement, with 181 of 489 (37%) having received radiation therapy. Patients with prior radiation therapy were older (median age72.0 vs 70.1 years, p <0.01) and had a higher median body mass index (29.4vs 28.6 kg/m(2), p <0.03) than those without radiation exposure. Rates of diabetes mellitus and hypertension were similar between the 2 groups. There was no significant difference in overall device survival between individuals who received radiation therapy and those without radiation therapy exposure, with 1and 5-year device survival rates of 92% vs 90% and 77% vs 74%, respectively (p=0.24). While individuals who underwent radiation therapy were significantly older and had a higher body mass index, device survival was not significantly different between the 2 groups when using a cuff size greater than 3.5 cm. These findings will assist the urologist with the preoperative counseling of men undergoing primary artificial urinary sphincter placement with a history of radiation therapy.