Effects of duloxetine on urethral continence reflex and bladder activity in rats with cerebral infarction

Minoru Miyazato, Takeya Kitta, Yasuhiro Kaiho, Takuma Oshiro, Seiichi Saito, Michael B. Chancellor, William C. De Groat, Naoki Yoshimura

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Purpose We investigated the effect of duloxetine, a norepinephrine and serotonin reuptake inhibitor, on the sneeze induced continence reflex and on bladder function in rats with cerebral infarction. Materials and Methods Using urethane anesthesia the effect of duloxetine (1 mg/kg intravenously) on the amplitude of urethral responses during sneezing as well as urethral baseline pressure at the mid urethra was evaluated in normal female adult rats and cerebral infarction rats. Tilt leak point pressure was also measured. In normal and cerebral infarction rats continuous cystometry was evaluated before and after duloxetine injection. Results In cerebral infarction rats urethral baseline pressure was 43% lower than in normal rats but the amplitude of urethral responses during sneezing did not differ in the 2 groups. Duloxetine increased the amplitude of urethral responses during sneezing and urethral baseline pressure by 31% and 21%, respectively, in normal rats but did not affect either in cerebral infarction rats. Also, in cerebral infarction rats leak point pressure was 29% lower compared with normal rats. Duloxetine increased leak point pressure in normal rats but not in cerebral infarction rats. Cerebral infarction reduced intercontraction intervals without affecting the amplitude of bladder contractions compared with normal rats. Duloxetine prolonged intercontraction intervals in cerebral infarction rats but not in normal rats. Conclusions These results suggest that cerebral infarction induces not only bladder overactivity but also stress urinary incontinence, which may account for mixed incontinence in patients with cerebral infarction. After cerebral infarction duloxetine reduced bladder overactivity but failed to enhance active urethral closure mechanisms during sneezing, suggesting that disorganization of the brain network after cerebral infarction might influence the effect of duloxetine on lower urinary tract function.

Original languageEnglish
Pages (from-to)842-847
Number of pages6
JournalJournal of Urology
Volume194
Issue number3
DOIs
Publication statusPublished - 2015 Sep 1

Keywords

  • cerebral infarction
  • duloxetine
  • stress
  • urethra
  • urinary bladder
  • urinary incontinence

ASJC Scopus subject areas

  • Urology

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