A New Implanted Posterior Tibial Nerve Stimulator for the Treatment of Overactive Bladder Syndrome: 3-Month Results of a Novel Therapy at a Single Center

Abstract

PURPOSE: This study was designed to investigate the safety and performance of a new implantable system for tibial nerve stimulation for overactive bladder symptoms. MATERIALS AND METHODS: A battery-free stimulation device for tibial nerve stimulation (BlueWind Medical, Herzliya, Israel) was implanted in 15 patients. Safety and efficacy assessments were done at 3 months after activation with a 3-day bladder diary, a 24-hour pad test and 2 quality of life questionnaires. RESULTS: Two males and 13 females were enrolled in the study. Mean age was 54 years (range 19 to 72). Five of 15 patients were previously treated with percutaneous tibial nerve stimulation and 12 experienced urgency urinary incontinence. Median operative time was 34 minutes. At 3 months of followup a significant change was seen in 24-hour frequency from a mean +/- SD of 11.8 +/- 3.5 to 8.1 +/- 2.0 times per day (p = 0.002), the number of severe urinary urgency episodes from 6.5 +/- 5.1 to 2.0 +/- 2.1 times per day (p = 0.002), the number of severe incontinence episodes from 2.8 +/- 5.2 to 0.3 +/- 0.4 episodes per day (p = 0.017), urinary loss per day from 243 +/- 388 to 39 +/- 55 gm (p = 0.038) and improvement in quality of life. After implantation, 3 patients received prolonged antibiotic treatment and 3 received pain medication for 1 week. In 1 patient the device was explanted due to pain and swelling suspicious for infection, although tissue cultures did not reveal a bacterial infection. CONCLUSIONS: This novel posterior tibial nerve stimulator is safe and easy to implant with good clinical results