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Declercq D, Peremans L, Glorieus M, Weygaerde YV, Schaballie H, Van Braeckel E, Snauwaert E, Van Daele S, Van Biervliet S. Urinary sodium/creatinine ratio is a predictor for fractional sodium excretion and related to age in patients with cystic fibrosis. J Cyst Fibros 2021; 21:e136-e140. [PMID: 34802939 DOI: 10.1016/j.jcf.2021.11.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 11/03/2021] [Accepted: 11/04/2021] [Indexed: 10/19/2022]
Abstract
Electrolyte disturbances are common in patients with cystic fibrosis (CF). Current guidelines on monitoring sodium status are based on research in a small group of infants and require blood sampling. The aim of this study was to evaluate urinary salt parameters as a surrogate for sodium-status in different age-groups. Blood and urine samples for electrolytes were collected from 222 patients followed at the Ghent University Hospital CF-center. Fractional sodium excretion (FENa) and several urinary parameters were calculated. Clinical characteristics did not differ according to sodium status, defined as FENa <0.5%. ROC analysis demonstrated that sodium/creatinine ratio (UNa/Creat) predicted the sodium status most accurately with high sensitivity and specificity (97 and 91% respectively). The UNa/Creat cut-off predicting a FENa <0.5% differed significantly according to age. The UNa/Creat is an excellent marker for the sodium status defined as a FENa <0.5%. However, different cut-offs according to age category should be applied.
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Affiliation(s)
- Dimitri Declercq
- Cystic Fibrosis Reference Center, Ghent University Hospital, C. Heymanslaan 10, Belgium; Center for Nutrition and Dietetics, Ghent University Hospital, C. Heymanslaan 10, Gent, Belgium.
| | - Lieselot Peremans
- Ghent University, Faculty of medicine and health sciences, C. Heymanslaan 10, Gent, Belgium
| | - Michiel Glorieus
- Ghent University, Faculty of medicine and health sciences, C. Heymanslaan 10, Gent, Belgium
| | - Yannick Vande Weygaerde
- Cystic Fibrosis Reference Center, Ghent University Hospital, C. Heymanslaan 10, Belgium; Department of Respiratory Medicine, Ghent University Hospital, C. Heymanslaan 10, Gent, Belgium
| | - Heidi Schaballie
- Cystic Fibrosis Reference Center, Ghent University Hospital, C. Heymanslaan 10, Belgium; Department of Paediatric Respiratory Medicine, Ghent University Hospital, C. Heymanslaan 10, Gent, Belgium
| | - Eva Van Braeckel
- Cystic Fibrosis Reference Center, Ghent University Hospital, C. Heymanslaan 10, Belgium; Department of Respiratory Medicine, Ghent University Hospital, C. Heymanslaan 10, Gent, Belgium
| | - Evelien Snauwaert
- Department of Paediatric Nephrology, Ghent University Hospital, C. Heymanslaan 10, Gent, Belgium
| | - Sabine Van Daele
- Cystic Fibrosis Reference Center, Ghent University Hospital, C. Heymanslaan 10, Belgium; Department of Paediatric Respiratory Medicine, Ghent University Hospital, C. Heymanslaan 10, Gent, Belgium
| | - Stephanie Van Biervliet
- Cystic Fibrosis Reference Center, Ghent University Hospital, C. Heymanslaan 10, Belgium; Department of Paediatric gastroenterology, Ghent University Hospital, C. Heymanslaan 10, Gent, Belgium
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