Reoperation After Sacral Neuromodulation Therapy: A Single-Institution Experience

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ObjectivesSacral neuromodulation has become an accepted treatment for various types of lower urinary tract dysfunction. However, despite technologic advances in device implantation and a trial stimulation period, sacral neuromodulation still has a significant reoperation rate. We report our single-institution experience of reoperation rates.MethodsWe performed a retrospective review of our patients who had undergone the implantation of the InterStim device from April 1999 to December 2011 for lower urinary tract dysfunction.ResultsA total of 155 InterStim devices were implanted by 2 surgeons. Of the 142 patients with complete follow-up, 55 (38.2%) patients required reoperation, for either revision or explantation of the device. Revisions were performed in 30 (21.1%) patients, most commonly for mechanical failure of device, battery end-of-service, and pain, either at the site of the implanted pulse generator or with stimulation. Of the 30 patients who underwent revision, 14 had successful results, 6 had persistent symptoms, and 10 progressed to eventual explantation.The overall explantation rate was 24.6% (35 of 142 patients), and the average time to removal was 44 months. Most of the explantations were performed for poor symptom control and failure to maintain response (74.3%).Reoperation was not associated with age, sex, obesity, diabetes, chronic pain, use of the tined lead, or type of lower urinary tract dysfunction.ConclusionsSacral neuromodulation has a substantial revision and explantation rate, without any clear predictors for these complications. Patients should be counseled to these complications before surgery.

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