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Bladder capacity at the time of enuresis
Akihiro Kawauchi1, Yoshiyuki Tanaka, Yasuyuki Naito
1Department of Urology, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kyoto, Japan.
Urology
|May 9, 2003
Summary
Children with nocturnal enuresis have a smaller bladder capacity during sleep compared to daytime capacity. This reduced capacity during sleep, unlike in controls, may be a key cause of bedwetting.
Area of Science:
- Urology
- Pediatrics
- Sleep Medicine
Background:
- Nocturnal enuresis, or bedwetting, affects many children.
- Understanding bladder function during sleep is crucial for effective treatment.
Purpose of the Study:
- To compare bladder capacity in children with monosymptomatic nocturnal enuresis (SNE) during enuresis events with that of healthy controls.
- To evaluate the relationship between daytime and nighttime bladder capacity in both enuretic and control groups.
Main Methods:
- Measured functional bladder capacity (FBC), ordinary bladder capacity (OBC), and enuretic bladder capacity (EBC) in 67 SNE patients.
- Measured FBC, OBC, and nocturnal bladder capacity in 67 controls.
- Utilized diapers and enuresis alarms to measure EBC in enuretic patients.
Main Results:
- Enuretic bladder capacity (EBC) was significantly smaller than the nocturnal bladder capacity in controls.
- In SNE patients, EBC was smaller than their daytime functional bladder capacity (FBC) and similar to their ordinary bladder capacity (OBC).
- No significant difference was found between FBC and nocturnal bladder capacity in controls.
Conclusions:
- Bladder capacity during sleep is significantly reduced in children with SNE compared to their daytime capacity.
- In contrast, healthy children show no difference between daytime and nighttime bladder capacity.
- Reduced ability to retain urine during sleep is a potential primary cause of SNE.