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Related Experiment Videos

An animal model of non-obstructive bladder instability.

K K Sethia1, A F Brading, J C Smith

  • 1Department of Urology, Oxford, United Kingdom.

The Journal of Urology
|June 1, 1990
PubMed
Summary

Bladder transection in minipigs caused instability and detrusor muscle supersensitivity. This study suggests anatomical denervation isn't required for bladder instability, offering a new model for research.

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Area of Science:

  • Urology
  • Physiology
  • Surgical Research

Background:

  • Bladder instability is a common clinical issue.
  • Current models often involve bladder outlet obstruction.
  • The role of nerve integrity in bladder instability requires further investigation.

Purpose of the Study:

  • To investigate bladder function after surgical transection in minipigs.
  • To determine if anatomical denervation is necessary for bladder instability.
  • To explore detrusor smooth muscle supersensitivity in a non-obstructed model.

Main Methods:

  • Eight minipigs underwent circumferential supratrigonal bladder transection.
  • Urodynamic studies were conducted pre- and post-operation (up to 8 months).
  • Physiological and histological analyses of bladder biopsies were performed.

Main Results:

  • All animals developed persistent bladder instability by 3 weeks post-transection.
  • Detrusor smooth muscle exhibited non-specific supersensitivity in vitro.
  • No loss of cholinergic nerves was observed in the transected bladder muscle.

Conclusions:

  • The transected minipig is a viable model for studying bladder instability without obstruction.
  • Anatomical denervation is not essential for unstable bladder contractions.
  • Detrusor supersensitivity occurs in both obstructed and non-obstructed bladder instability.

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