Effects of periurethral neuromuscular electrical stimulation on the voiding frequency in rats

Yingchun Zhang, Andrew D. Bicek, Guangjian Wang, Gerald W. Timm

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Introduction and hypothesis: This study aims to test the hypothesis that a urethra-to-bladder inhibitory pathway exists through which periurethral neuromuscular electrical stimulation (NMES) inhibits overactive bladder contractions in rats. Methods: Bladder overactivity was induced in 22 female Sprague Dawley rats by injection of ketamine/xylazine/acepromizine (K/X/A). A bipolar electrode was placed surgically in the periurethral region to deliver NMES. Intravesical pressure, bladder inter-contraction interval (ICI) and voided volume (VV) were monitored while the bladder was continuously infused with saline. Results: K/X/A induced more frequent bladder contractions (ICI=48.6±20.1 s, before cutting the pubo-symphasis) compared to a 10-min ICI induced by urethane. NMES significantly increased ICI (63.1±31.3 s before vs. 97.2± 42.9 s after NMES, p<0.001) and VV (0.063=0.041 ml before vs. 0.088=0.044 ml after NMES, p<0.02). Conclusions: Injection of K/X/A may potentially be used as a model of bladder overactivity. NMES inhibits bladder contractions in rats with bladder overactivity, which supports the existence of a urethra-to-bladder inhibitory pathway.

Original languageEnglish (US)
Pages (from-to)1279-1284
Number of pages6
JournalInternational Urogynecology Journal
Volume21
Issue number10
DOIs
StatePublished - Oct 2010

Keywords

  • Bladder overactivity
  • Intravesical pressure
  • Ketamine/xylazine/acepromizine
  • Periurethral neuromuscular electrical stimulation
  • Urinary incontinence
  • Voiding dysfunction

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