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The effects of bladder over distention on voiding function in kindergarteners
Stephen Shei-Dei Yang1, Shang-Jen Chang
1Division of Urology, Buddhist Tzu Chi General Hospital, Taipei and Medical College of Buddhist Tzu Chi University, Hualien, Taiwan.
The Journal of Urology
|September 23, 2008
Summary
Bladder over distention in children negatively impacts voiding function, leading to abnormal uroflowmetry curves and increased post-void residual urine. Extreme overdistention also decreases peak flow rate, highlighting the importance of optimal bladder capacity.
Area of Science:
- Pediatric Urology
- Voiding Dysfunction
- Urodynamics
Background:
- Assessing pediatric voiding function is crucial for diagnosing and managing lower urinary tract issues.
- Understanding the impact of bladder overdistention on normal voiding patterns is essential for accurate urodynamic interpretation.
Purpose of the Study:
- To investigate the effects of bladder overdistention on pediatric voiding function.
- To establish criteria for defining bladder overdistention in children using uroflowmetry and post-void residual measurements.
Main Methods:
- Healthy kindergarten children underwent uroflowmetry and post-void residual urine assessments.
- Bladder capacity was calculated as a percentage of expected capacity.
- Uroflowmetry curves were classified as bell-shaped or nonbell-shaped.
Main Results:
- Bladder overdistention (≥115% expected capacity) was associated with a higher incidence of nonbell-shaped uroflowmetry curves and increased post-void residual urine (p <0.01).
- Nonbell-shaped curves typically occurred at higher bladder capacities compared to bell-shaped curves (133% vs. 84% expected capacity, p <0.01).
- Peak uroflow rate increased with bladder capacity but decreased during extreme overdistention.
Conclusions:
- Optimal bladder capacity is vital for accurate assessment of pediatric voiding function.
- Bladder overdistention significantly alters uroflowmetry patterns and increases post-void residual urine.
- Extreme bladder overdistention adversely affects peak urinary flow rate.
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