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Changes in bladder wall blood oxygen saturation in the overactive obstructed bladder.

Jeroen R Scheepe1, Arjen Amelink, Bas W D de Jong

  • 1Department of Urology and Pediatric Urology, Erasmus Medical Centre, Sophia Children's Hospital, Rotterdam, The Netherlands. j.scheepe@erasmusmc.nl

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Bladder outlet obstruction significantly lowers bladder wall oxygen saturation during filling and voiding. This reduction is linked to increased bladder pressure and overactivity, impacting bladder function.

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Area of Science:

  • Urology
  • Physiology

Background:

  • Hypoxia of the bladder wall is implicated in bladder dysfunction.
  • The precise relationship between bladder function and blood oxygen saturation remains unclear.

Purpose of the Study:

  • To determine bladder wall blood oxygen saturation in vivo.
  • To establish the relationship between blood oxygen saturation and bladder function in a model of bladder outlet obstruction.

Main Methods:

  • Measured bladder wall blood oxygen saturation using differential path length spectroscopy in sham-operated and obstructed guinea pigs.
  • Conducted urodynamic investigations over 8 weeks to assess bladder function.

Main Results:

  • Normal bladder wall oxygen saturation ranged from 88-95% during filling, decreasing during voiding.
  • Obstruction led to significantly lower saturation during filling and voiding compared to controls.
  • Reduced saturation correlated with increased bladder pressure and was more pronounced with overactivity.

Conclusions:

  • A healthy bladder maintains high oxygen saturation during filling.
  • Bladder obstruction impairs oxygen saturation, particularly when overactivity is present.
  • Local bladder contractions, even without increased pressure, decrease blood saturation.