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Diuresis and voiding pattern in healthy schoolchildren

S Mattsson1, S Lindström

  • 1Department of Paediatrics, Faculty of HEalth Sciences, Linköping, Sweden.

British Journal of Urology
|December 1, 1995
PubMed
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Diuresis (urine production) varies significantly in healthy children. Some children exhibit a reversed diurnal pattern, producing more urine at night, with bladder capacity adapting to this individual pattern.

Area of Science:

  • Pediatric Nephrology
  • Urology
  • Physiology

Background:

  • Micturition patterns in children are influenced by various physiological factors.
  • Understanding diurnal variations in urine production is crucial for assessing bladder function.

Purpose of the Study:

  • To investigate the impact of diuresis variations on normal micturition patterns in healthy children.
  • To analyze the relationship between diuresis, fluid intake, bladder capacity, and voiding habits.

Main Methods:

  • A 24-hour frequency/volume chart was completed by 206 healthy, continent schoolchildren (aged 7-15 years).
  • Diuresis variables were calculated and compared with demographic and functional parameters.
  • Weight-corrected diuresis was assessed in relation to fluid intake, bladder capacity, and voiding intervals.

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Main Results:

  • Weight-corrected 24-hour diuresis showed a 10-fold variation among individuals, irrespective of recorded fluid intake.
  • A reversed diurnal pattern (higher night-time diuresis) was observed in 12% of the children.
  • Night-time diuresis correlated positively with functional bladder capacity, while daytime diuresis correlated with voiding frequency.

Conclusions:

  • Significant inter-individual variability exists in weight-corrected diuresis among healthy children.
  • A notable proportion of children display a reversed diurnal urine production pattern.
  • Individual bladder capacity appears to adapt to accommodate typical nightly urine output.