title: Efficacy of sacral nerve stimulation for urinary retention: results 18 months after implantation.
abstract: OBJECTIVE
  We investigate the efficacy of sacral neurostimulation in patients with idiopathic urinary retention in a prospective, randomized multicenter trial.
  
  
  METHODS
  A total of 177 patients with urinary retention refractory to standard therapy were enrolled in the study. Greater than 50% improvement in baseline voiding symptoms during a 3 to 7-day percutaneous test stimulation qualified a patient for surgical implantation of an InterStim parallel system. Of the patients who qualified for implantation 37 were randomly assigned to a treatment and 31 to a control group. Patients in the treatment group underwent early surgical implantation of the sacral nerve stimulation system, while implantation was delayed in the control group for 6 months. Followup evaluations, including voiding diary analysis and temporary deactivation of the stimulator at 6 months, were conducted at 1, 3, 6, 12 and 18 months after implantation in the treatment group, and after 3 and 6 months in the control group.
  
  
  RESULTS
  Compared to the control group, patients implanted with the InterStim system had statistically and clinically significant reductions in the catheter volume per catheterization (p <0.0001). Of the patients treated with implants 69% eliminated catheterization at 6 months and an additional 14% had a 50% or greater reduction in catheter volume per catheterization. Therefore, successful results were achieved in 83% of the implant group with retention compared to 9% of the control group at 6 months. Temporary inactivation of sacral nerve stimulation therapy resulted in a significant increase in residual volumes (p <0.0001) but effectiveness of sacral nerve stimulation was sustained through 18 months after implant.
  
  
  CONCLUSIONS
  Results of this prospective, randomized clinical study demonstrate that sacral nerve stimulation is effective for restoring voiding in patients with retention who are refractory to other forms of treatment.
authors: Medizinische Hochschule Hannover, Hannover, Germany.
authors: U
authors: U
authors: Jonas
authors: C J
authors: CJ
authors: Fowler
authors: M B
authors: MB
authors: Chancellor
authors: M M
authors: MM
authors: Elhilali
authors: M
authors: M
authors: Fall
authors: J B
authors: JB
authors: Gajewski
authors: V
authors: V
authors: Grünewald
authors: M M
authors: MM
authors: Hassouna
authors: U
authors: U
authors: Hombergh
authors: R
authors: R
authors: Janknegt
authors: P E
authors: PE
authors: van Kerrebroeck
authors: A A
authors: AA
authors: Lylcklama a Nijeholt
authors: S W
authors: SW
authors: Siegel
authors: R A
authors: RA
authors: Schmidt
mesh_terms: D000328:Adult; D004599:Electric Stimulation Therapy / Q000295:instrumentation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011446:Prospective Studies; D012447:Sacrum / Q000294:innervation; D013127:Spinal Nerves / Q000502:physiology*; D013997:Time Factors; D014546:Urinary Catheterization; D016055:Urinary Retention / Q000503:physiopathology / Q000628:therapy*; D014554:Urination / Q000502:physiology