CALCIURIA IN CHILDREN WITH PRIMARY MONO-SYMPTOMATIC NOCTURNAL ENURESIS

Introduction: The prevalence of idiopathic hypercalciuria (IH) in healthy pediatric population ranges from 3.0% to 7.0%. There is insufficient data about IH in children with mono-symptomatic enuresis. The aim of this study was to examine calcium excretion in urine (UCa) in patients with primary mono-symptomatic nocturnal enuresis (PMNE). Methods: In patients with PMNE, aged 5 to 17 years, IH was determined in 24-h urine and from second morning spot urine. The completeness of the 24-h urine collections was estimated via measuring 24h-urine creatinine excretion (UCr) of 0.1–0.2 mmol/kg/24h. Results: Sixty patients with PMNE, 32 males and 28 girls, median age of  9 years were enrolled in the study. Only 41.7% patients successfully completed 24 h urine collection. IH, defined as 24-h UCa >0.1 mmol/kg body weight, was diagnosed in 12% of the patients, while when defined as UCa/UCr >0.8 mmol/mmol in children 5-7 years and >0.6 mmol/mmol in those>7 years, IH was 8.3% and 6.7% from 24h- urine and spot urine, respectively. Conclusion: Children and adolescents with PMNE are in risk of hypercalciuria. Therefore, it is useful to examine 24 hours of urine calcium excretion in these patients.