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Fluid intake and urinary osmolality in pediatric patients with functional constipation

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A Correction to this article was published on 13 October 2021

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Abstract

Purpose

This study aimed to evaluate fluid intake and urinary osmolality in pediatric patients with functional constipation.

Methods

This was a cross-sectional, case–control study that prospectively included two groups: 36 pediatric patients older than 4 years with functional constipation (Rome III criteria) who were consecutively admitted in a public tertiary pediatric gastroenterology outpatient clinic and 93 controls with normal bowel habits. The control group was recruited from a public school and did not have any of the characteristics of the Rome III criteria. Fluid and food intakes were assessed using a daily diet inquiry and 24 h recording method. Hypohydration was defined as osmolality greater than 800 mOsm/kg H2O in a spot urine sample.

Results

The age of the functional constipation group (median, 8.9 years; range 7.3–10.0 years) and the control group (8.8 years) was similar (p = 0.51). The proportion of boys in the functional constipation group (76.6%; 25/36) was higher (p = 0.01) than that in the control group (45.2%; 41/93). The total water intake of the functional constipation group (median 1566 mL) was lower (p < 0.001) than that of the control group (median 2177 mL). Urinary osmolality was higher (p = 0.039) in the functional constipation group (median 859 mOsm/kg H2O) than in the control group (median 775 mOsm/kg H2O). The association between hypohydration and functional constipation did not reach statistical significance (Odds ratio 2.06; 95% confidence interval 0.93–4.55; p = 0.073).

Conclusion

Compared to the control group, patients with functional constipation have lower fluid intake and higher urinary osmolality.

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Data availability

Available for the authors.

Code availability

None.

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Funding

CNPq-Conselho Nacional de Desenvolvimento Científico e Tecnológico (The National Council for Scientific and Technological Development, Brazil).

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All authors contributed to the accomplishment of the article with significant intellectual contributions. All authors have approved the final version of the manuscript and assume responsibility for the content.

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Correspondence to Mauro Batista de Morais.

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Approved by the Research Ethics Committee of the Universidade Federal de São Paulo (CEP 859.533).

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Participants signed the informed consent and assent forms.

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Cite this article

Boilesen, S.N., Dias, F.C., Tahan, S. et al. Fluid intake and urinary osmolality in pediatric patients with functional constipation. Eur J Nutr 60, 4647–4655 (2021). https://doi.org/10.1007/s00394-021-02657-2

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