Sacral neuromodulation for neurogenic lower urinary tract dysfunction: systematic review and meta-analysis.

Context: Treatment of neurogenic lower urinary tract dysfunction (LUTD) is a challenge, because conventional therapies often fail. Sacral neuromodulation (SNM) has become a well-established therapy for refractory non-neurogenic LUTD, but its value in patients with a neurologic cause is unclear.

Objective: To assess the efficacy and safety of SNM for neurogenic LUTD.

Evidence Acquisition: Studies were identified by electronic search of PubMed, EMBASE, and ScienceDirect (on 15 April 2010) and hand search of reference lists and review articles. SNM articles were included if they reported on efficacy and/or safety of tested and/or permanently implanted patients suffering from neurogenic LUTD. Two reviewers independently selected studies and extracted data. Study estimates were pooled using Bayesian random-effects meta-analysis.

Evidence Synthesis: Of the 26 independent studies (357 patients) included, the evidence level ranged from 2b to 4 according to the Oxford Centre for Evidence-Based Medicine. Half (n=13) of the included studies reported data on both test phase and permanent SNM; the remaining studies were confined to test phase (n=4) or permanent SNM (n=9). The pooled success rate was 68% for the test phase (95% credibility interval [CrI], 50-87) and 92% (95% CrI, 81-98%) for permanent SNM, with a mean follow-up of 26 mo. The pooled adverse event rate was 0% (95% CrI, 0-2%) for the test phase and 24% (95% CrI, 6-48%) for permanent SNM.

Conclusions: There is evidence indicating that SNM may be effective and safe for the treatment of patients with neurogenic LUTD. However, the number of investigated patients is low with high between-study heterogeneity, and there is a lack of randomised, controlled trials. Thus, well-designed, adequately powered studies are urgently needed before more widespread use of SNM for neurogenic LUTD can be recommended.