{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:44:49Z","timestamp":1760147089936,"version":"build-2065373602"},"reference-count":11,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2023,1,4]],"date-time":"2023-01-04T00:00:00Z","timestamp":1672790400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Background: We previously reported that for around 5% of patients hospitalized with hyponatremia, it was related to what is called \u201ctransient renal salt wasting\u201d (TRSW). In the present study we ask whether TRSW can also be observed in patients without hyponatremia. Methods: In this observational retrospective study we analyze the urine solute excretion of 200 consecutive normonatremic patients with normal kidney function and admitted in our department over one year. Patients were selected for analyses of FE.K, UCa\/UCr and FE.PO4 if FE.Na was higher than 2% (N &lt; 1.6%) before any treatment, and only if they were not taking diuretics. Result: Eleven normonatremic patients presented with transient high FE.Na &gt; 2% on admission (2.9 \u00b1 0.6% with a high FE.K of 28 \u00b1 6.4%; a high UCa\/UCr of 0.37 \u00b1 0.13 and a high FE.PO4 of 23.2 \u00b1 9.6%). All of these patients were elderly. Seven were female and four were male. Neurological disorders were observed in six patients (three strokes, one transient ischemic attack, one syncope and one epileptic attack). Heart problems were observed in three patients (all angina pectoris, two of which also had HBP). One patient presented with rectal bleeding with HBP, and another presented COPD with a pneumothorax. One patient with angina pectoris showed a transient relapse after four days of hospitalization (FE.Na 3.6%). The urine electrolyte excretion in these patients are similar to those observed after furosemide intake. Conclusion: Normonatremic TRSW is not a rare observation, particularly in patients with neurological or cardiac problems.<\/jats:p>","DOI":"10.3390\/jcm12020397","type":"journal-article","created":{"date-parts":[[2023,1,4]],"date-time":"2023-01-04T02:54:55Z","timestamp":1672800895000},"page":"397","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Normonatremic Transient Renal Salt Wasting (TRSW) Is Not Rare in a Department of Internal Medicine"],"prefix":"10.3390","volume":"12","author":[{"given":"Wim","family":"Musch","sequence":"first","affiliation":[{"name":"Department of Internal Medicine, Iris South Hospital, B-1070 Brussels, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guy","family":"Decaux","sequence":"additional","affiliation":[{"name":"Research Unit for the Study of Hydromineral Metabolism, Department of Internal Medicine, Erasme Hospital, Free University of Brussels (ULB), B-1070 Brussels, Belgium"},{"name":"Department of Internal Medicine, Moli\u00e8re-Longchamps Hospital, Rue Marconi, 142, B-1190 Brussels, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1023\/A:1017586004688","article-title":"Utility and limitations of biochemical parameters in the evolution of hyponatremia in the elderly","volume":"32","author":"Musch","year":"2001","journal-title":"Int. Urol. Nephrol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"344","DOI":"10.5414\/CN109472","article-title":"Hyponatremia secondary to transient renal salt wasting (TRSW): A not so uncommon observation in the elderly","volume":"91","author":"Musch","year":"2019","journal-title":"Clin. Nephrol."},{"key":"ref_3","first-page":"57","article-title":"A salt wasting syndrome associated with cerebral disease","volume":"63","author":"Peters","year":"1950","journal-title":"Trans. Assoc. Am. Physicians"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1037","DOI":"10.1056\/NEJM196011242632101","article-title":"Hyponatremia and renal wasting of sodium in patients with malfunction of the central nervous system","volume":"263","author":"Golber","year":"1960","journal-title":"N. Engl. J. 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Int."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"769","DOI":"10.1172\/JCI111759","article-title":"Renal mechanism of action of rat atrial natriuretic factor","volume":"75","author":"Huang","year":"1985","journal-title":"J. Clin. Investig."}],"container-title":["Journal of Clinical Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2077-0383\/12\/2\/397\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T17:58:10Z","timestamp":1760119090000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2077-0383\/12\/2\/397"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,1,4]]},"references-count":11,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2023,1]]}},"alternative-id":["jcm12020397"],"URL":"https:\/\/doi.org\/10.3390\/jcm12020397","relation":{},"ISSN":["2077-0383"],"issn-type":[{"type":"electronic","value":"2077-0383"}],"subject":[],"published":{"date-parts":[[2023,1,4]]}}}