JOURNAL ARTICLE

Increased nocturnal blood pressure in enuretic children with polyuria

Anne Kruse, Birgitte Mahler, Soren Rittig, Jens Christian Djurhuus
Journal of Urology 2009, 182 (4 Suppl): 1954-60
19695582

PURPOSE: We investigated the association between nocturnal blood pressure and urine production in children with enuresis.

MATERIALS AND METHODS: A total of 39 consecutive children with a mean age of 9.8 years (range 6.2 to 14.9) with monosymptomatic nocturnal enuresis completed a bladder diary, including 2 weeks of basic documentation and 2 with desmopressin titration from 120 to 240 microg sublingually. Arterial blood pressure was measured every 30 minutes during 24 hours and during 4 additional nights using an ambulatory blood pressure monitor. Furthermore, 10 healthy children were recruited into the study who completed a bladder diary for 5 days while measuring arterial blood pressures with documentation of all intake and voided volumes.

RESULTS: Patients with nocturnal polyuria had significantly higher nocturnal mean arterial pressure than patients without polyuria and controls (p <0.05). Furthermore, a positive correlation was seen between nocturnal urine output and nocturnal mean arterial pressure (r = 0.32, p <0.001). Nocturnal urine output was significantly higher during wet nights than dry nights (p <0.001). However, no significant difference was found in mean arterial pressure between wet and dry nights.

CONCLUSIONS: Nocturnal mean arterial pressure was significantly higher in children with enuresis with polyuria than in children without polyuria. There was a significant positive correlation between average nocturnal mean arterial pressure and nocturnal urine volume in the whole study. The association between nocturnal blood pressure and urine volume, and the role of blood pressure should be investigated in a larger group of children with enuresis who have nocturnal polyuria.

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