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Preventing hyponatraemic dehydration in cystic fibrosis: a cautionary note to take coconut water with a pinch of salt
  1. Rebecca Sayer,
  2. Ian Sinha,
  3. Jacqueline Lowdon,
  4. Jay Panickar
  1. Department of Respiratory Paediatrics, Royal Manchester Children's Hospital, Manchester, UK
  1. Correspondence to Dr Rebecca Sayer, Department of Respiratory Paediatrics, Royal Manchester Children's Hospital, Oxford Road, Manchester M13 9WL, UK; rebeccasayer{at}nhs.net

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Children and young people with cystic fibrosis (CF) are at risk of hyponatraemic dehydration in hot weather, largely because they lose substantial amounts of salt in sweat. Secretion of aldosterone, secondary to sodium loss, can cause pseudo-Bartter’s syndrome, manifest as hyponatraemia, hypochloremia, hypokalaemia and metabolic alkalosis. Children and families are therefore advised to remain well hydrated during summer months and often increase their dietary sodium intake, or take additional supplements.

Recently, coconut water has been marketed as good fluid for rehydration purposes. The proposed advantages are that coconut water is …

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  • Contributors RS: acquisition and interpretation of data; drafting the letter; final approval of letter; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. IS: substantial contributions to the conception of the work; drafting the letter; final approval of letter; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. JL: interpretation of data; revising intellectual content; final approval of letter; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. JP: interpretation of data; critical analysis of content; final approval of letter; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

  • Competing interests None.

  • Provenance and peer review Not commissioned; internally peer reviewed.

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