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Challenges in using fractional excretion of sodium in the assessment of salt poisoning

Shenoy, S; Bockenhauer, D; (2024) Challenges in using fractional excretion of sodium in the assessment of salt poisoning. Acta Paediatrica: Nurturing the Child , 113 (1) 15--154. 10.1111/apa.16734. Green open access

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Abstract

AIM: Hypernatraemia typically reflects dehydration, yet in rare instances may be caused by salt poisoning. Identifying these rare cases is a difficult challenge. Making the diagnosis of salt poisoning can have severe consequences, such as removal of the child from its home or even prison sentences for the implicated carer. It is therefore imperative to get the diagnosis right. Guidelines for the assessment of hypernatraemia emphasise the importance of the fractional excretion of sodium to distinguish between dehydration and salt poisoning, but no generally accepted cut-off value exists. Opinions about the diagnosis of salt poisoning in some cases consequently may differ. Here, we aim to highlight the challenges and stimulate discussion on how to improve the tools for the assessment of hypernatraemia. METHODS: Report of a case of unexplained hypernatraemia in which the treating paediatrician raised the suspicion of salt poisoning. RESULTS: Two consulted experts made opposing judgements about the aetiology of the observed hypernatraemia. CONCLUSION: Clear diagnostic criteria for the diagnosis of salt poisoning are lacking and more data are needed for their establishment. Without this, victims may experience further harm and carers are at risk of devastating, yet potentially erroneous accusations.

Type: Article
Title: Challenges in using fractional excretion of sodium in the assessment of salt poisoning
Location: Norway
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/apa.16734
Publisher version: https://doi.org/10.1111/apa.16734
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Dehydration, fractional excretion of sodium, hypernatraemia, salt poisoning
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine > Renal Medicine
URI: https://discovery.ucl.ac.uk/id/eprint/10165884
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