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In vitro intravesical instillation of anticholinergic, antispasmodic and calcium blocking agents to decrease bladder

K Kato1, A Kondo, M Saito

  • 1Department of Urology, Nagoya University School of Medicine, Japan.

Urologia Internationalis
|January 1, 1991
PubMed
Summary
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Intravesical administration of drugs like atropine effectively reduced bladder pressure responses in rabbits. This suggests self-catheterization with these medications could treat overactive bladder conditions.

Area of Science:

  • Pharmacology
  • Urology
  • Physiology

Background:

  • Detrusor hyperreflexia causes involuntary bladder contractions.
  • Current treatments for detrusor hyperreflexia have limitations.
  • Intravesical drug administration offers a localized treatment approach.

Purpose of the Study:

  • To evaluate the efficacy of various intravesical drugs in suppressing bladder pressure responses.
  • To compare the effects of different drug classes on bladder contractility.

Main Methods:

  • Utilized an in vitro rabbit whole bladder model.
  • Administered atropine, oxybutynin, verapamil, diltiazem, and imipramine intravesically.
  • Measured bladder pressure responses to field stimulation and bethanechol.

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Main Results:

  • All tested drugs significantly suppressed bladder pressure responses in a time-dependent manner.
  • Maximum drug effect was observed between 90-120 minutes post-administration.
  • Atropine and oxybutynin showed greater suppression of bethanechol-induced contractions compared to field stimulation.

Conclusions:

  • Intravesical drug instillation is a viable therapeutic strategy for detrusor hyperreflexia.
  • Self-intravesical instillation may be particularly beneficial for patients using intermittent catheterization.
  • Further research could explore optimizing drug combinations and delivery for enhanced efficacy.