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Saudi Journal of Kidney Diseases and Transplantation
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ORIGINAL ARTICLE Table of Contents   
Year : 2016  |  Volume : 27  |  Issue : 4  |  Page : 726-732
Evaluation of aldosterone excretion in very low birth weight infants

1 Department of Pediatrics, Faculty of Medicine, El-Minia University, Cairo, Egypt
2 Department of Biochemistry, Faculty of Medicine, El-Minia University, Cairo, Egypt

Correspondence Address:
Abdel Hakeem Abdel Mohsen
Department of Pediatrics, Faculty of Medicine, El-Minia University, Cairo
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1319-2442.185234

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Data about aldosterone production and excretion in the neonatal period are still few and controversial. Our objectives are to assess urinary aldosterone excretion (UAE) in very low birth weight (VLBW) infants and to identify clinical and biochemical variables that may influence this excretion. Thirty VLBW infants (14 males and 16 females), their gestational age <32 weeks and body weight <1500 g, were included in the study. Demographic and clinical data were recorded, within the first 72 h of life and urine and blood samples were collected for the measurement of urinary aldosterone and serum potassium, sodium, and chloride. The mean UAE value was 0.176 ± 0.05 μg/24 h and the mean absolute UAE was 1906 ± 271 pg/mL. There was a statistically significant positive correlation between UAE and gestational age and birth weight; also, infants with respiratory distress syndrome had higher urinary aldosterone levels than infants without respiratory distress. Only plasma sodium was a significant independent factor that negatively influenced UAE on linear regression analysis. The renin-angiotensin-aldosterone system of VLBW infants seems to be able, even immediately after birth, to respond to variations of plasma sodium concentrations; measurement of UAE constitutes an interesting method to determine aldosterone production in VLBW infants.

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