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Functional bladder capacity and urine osmolality in children with primary monosymptomatic nocturnal enuresis

Authors :
Anna Wasilewska
Agata Korzeniecka-Kozerska
Walentyna Zoch-Zwierz
Source :
Scandinavian journal of urology and nephrology. 39(1)
Publication Year :
2005

Abstract

To assess functional day-time bladder capacity (DBC) and urine osmolality in children with primary monosymptomatic nocturnal enuresis (PMNE) according to age and sex.A total of 263 children with PMNE were divided into two groups: Group I, 160 children (63 girls, 97 boys) aged 5-9 years (mean age 7.14+/-1.47 years); and Group II, 103 children (25 girls, 78 boys) aged 10-15 years (mean age 12.26+/-1.52 years). DBC (milliliters) was the largest void of the day measured over four 24-h periods, irrespective of the diet applied. Urine osmolality was determined three times: in the evening before bed-time; at night, 2-4 h after falling asleep; and in the morning in the nocturnal void.DBC was smaller in Group I than in Group II (151.27 vs 199.46 ml; p0.05). No statistically significant differences were found in relation to sex (p0.05). The mean osmolality of the nocturnal void in the morning was 854.15 and 909.22 mOsmol/kg H(2)O in Groups I and II, respectively (p0.05). Differences between boys and girls were not statistically significant (p0.05). No correlation was found between DBC and urine osmolality (p0.05). A detailed analysis of the results revealed DBC below the 5th percentile or above the 95th percentile in 23/263 cases (8.7%), reduced osmolality (800 mOsmol/kg H(2)O) in 76/263 (28.8%), a familial nature of nocturnal enuresis in 124/263 (47.1%) and difficulty waking in 86/263 (32.7%).In children with PMNE aged 5-15 years, functional DBC increases with age and does not differ between the sexes; the mean nocturnal urine osmolality is neither age- nor sex-dependent.

Details

ISSN :
00365599
Volume :
39
Issue :
1
Database :
OpenAIRE
Journal :
Scandinavian journal of urology and nephrology
Accession number :
edsair.doi.dedup.....a9ca7151b783512e521daf11d522dd74