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Diuresis and voiding pattern in healthy schoolchildren
1Department of Paediatrics, Faculty of HEalth Sciences, Linköping, Sweden.
Insights
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.
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.
Objective:
To analyse how differences in diuresis affect the normal pattern of micturition of healthy children.
Subjects And Methods:
Two hundred and six healthy continent schoolchildren, aged 7-15 years, completed a frequency/volume chart for 24 h by recording the time and volume of each micturition. Several diuresis variables were calculated from these charts and compared with sex, age, oral fluid intake, functional bladder capacity, voiding intervals and volumes.
Results:
The weight-corrected mean diuresis per 24 h varied 10-fold between individuals, independently of recorded fluid intake. In the majority, the diuresis decreased during the night, but the opposite diurnal pattern occurred in 12% of the children. The individual night-time diuresis was positively correlated with functional bladder capacity and the daytime diuresis was positively correlated with voiding frequency.
Conclusions:
The weight-corrected diuresis varies many-fold among healthy continent children. A substantial proportion has a reversed diurnal pattern with a larger diuresis during the night. The individual bladder size is adapted to accommodate their typical nightly urine production.
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