{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T05:20:22Z","timestamp":1788931222552,"version":"build-2803163510"},"reference-count":87,"publisher":"Bioscientifica","issue":"1","license":[{"start":{"date-parts":[[2022,8,1]],"date-time":"2022-08-01T00:00:00Z","timestamp":1659312000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["eo.bioscientifica.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,8,1]]},"abstract":"<jats:p>Hyponatraemia is a common electrolyte abnormality seen in a wide range of oncological and haematological malignancies and confers poor performance status, prolonged hospital admission and reduced overall survival, in patients with cancer. Syndrome of inappropriate antidiuresis (SIAD) is the commonest cause of hyponatraemia in malignancy and is characterised by clinical euvolaemia, low plasma osmolality and concentrated urine, with normal renal, adrenal and thyroid function. Causes of SIAD include ectopic production of vasopressin (AVP) from an underlying tumour, cancer treatments, nausea and pain. Cortisol deficiency is an important differential in the assessment of hyponatraemia, as it has an identical biochemical pattern to SIAD and is easily treatable. This is particularly relevant with the increasing use of immune checkpoint inhibitors, which can cause hypophysitis and adrenalitis, leading to cortisol deficiency. Guidelines on the management of acute, symptomatic hyponatraemia recommend 100 mL bolus of 3% saline with careful monitoring of the serum sodium to prevent overcorrection. In cases of chronic hyponatraemia, fluid restriction is recommended as first-line treatment; however, this is frequently not feasible in patients with cancer and has been shown to have limited efficacy. Vasopressin-2 receptor antagonists (vaptans) may be preferable, as they effectively increase sodium levels in SIAD and do not require fluid restriction. Active management of hyponatraemia is increasingly recognised as an important component of oncological management; correction of hyponatraemia is associated with shorter hospital stay and prolonged survival. The awareness of the impact of hyponatraemia and the positive benefits of active restoration of normonatraemia remain challenging in oncology.<\/jats:p>","DOI":"10.1530\/eo-22-0056","type":"journal-article","created":{"date-parts":[[2022,7,11]],"date-time":"2022-07-11T13:39:23Z","timestamp":1657546763000},"page":"R78-R89","update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-15","source":"Crossref","is-referenced-by-count":19,"title":["Hyponatraemia and the syndrome of inappropriate antidiuresis (SIAD) in cancer"],"prefix":"10.1530","volume":"2","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4745-9922","authenticated-orcid":true,"given":"D Mc","family":"Donald","sequence":"first","affiliation":[{"name":"Academic Department of Endocrinology, Beaumont Hospital, Dublin, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Sherlock","sequence":"additional","affiliation":[{"name":"Academic Department of Endocrinology, Beaumont Hospital, Dublin, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C J","family":"Thompson","sequence":"additional","affiliation":[{"name":"Academic Department of Endocrinology, Beaumont Hospital, Dublin, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"416","reference":[{"key":"bib1","series-title":"European Journal of Cancer Care","first-page":"224","article-title":"Hyponatraemia in cancer: association with type of cancer and mortality","volume":"24","author":"Abu Zeinah","year":"2014","unstructured":"Abu Zeinah GFAl-Kindi SHassan AAllam A2014Hyponatraemia in cancer: association with type of cancer and mortality. 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