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Some new insights into bladder function in infancy

C K Yeung1, M L Godley, C K Ho

  • 1Department of Surgery, Chinese University of Hong Kong, Prince of Wales Hospital.

British Journal of Urology
|August 1, 1995
PubMed
Summary
This summary is machine-generated.

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Normal infant bladder function is stable, emptying nearly completely. Micturition occurs during wakefulness or arousal, not quiet sleep, challenging the uninhibited bladder concept.

Area of Science:

  • Pediatric Urology
  • Neuroscience
  • Physiology

Background:

  • The traditional view posits a completely uninhibited infant bladder.
  • Understanding normal bladder function and micturition patterns in infants is crucial for pediatric urology.
  • Infant voiding mechanisms require further elucidation.

Purpose of the Study:

  • To evaluate normal bladder function and micturition patterns in infants.
  • To investigate the relationship between bladder filling, detrusor pressure, and voiding efficiency.
  • To determine the sleep state associated with micturition in neonates and infants.

Main Methods:

  • Natural filling cystometry was performed on 21 infants (mean age 5.9 months) without lower urinary tract pathology.
  • Micturition patterns were simultaneously observed with polysomnography in 26 healthy neonates (mean age 7.4 days).

Related Experiment Videos

  • Key parameters measured included bladder capacity, detrusor pressure, voiding efficiency, and associated sleep states.

    • Main Results:

    • Infant bladder capacity averaged 42-53 mL, with a voiding efficiency of 0.86-0.91.
    • Detrusor pressure during voiding ranged from 95-120 cmH2O; discoordinated urinary flow was noted in 10 infants.
    • Micturition exclusively occurred during wakefulness or arousal from sleep, never during quiet sleep.

    Conclusions:

    • The infant bladder demonstrates stability and near-complete emptying, contradicting the 'uninhibited bladder' theory.
    • Incomplete coordination during voiding may be a normal finding in infants.
    • Cortical arousal in response to bladder fullness, even in neonates, suggests a more complex control mechanism than previously thought, with implications for enuresis management.