{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,3]],"date-time":"2025-08-03T22:55:36Z","timestamp":1754261736199,"version":"3.37.3"},"reference-count":33,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2022,4,22]],"date-time":"2022-04-22T00:00:00Z","timestamp":1650585600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical Endocrinology"],"published-print":{"date-parts":[[2023,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To understand differences in thyroid hormone replacement therapy with levo\u2010thyroxine (<jats:sc>l<\/jats:sc>\u2010T4) between acquired and congenital hypothyroid (CH)\u00a0patients.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>We compared biochemical thyroid parameters between euthyroid subjects (EU) and both CH adult patients and thyroidectomized patients (TP) under replacement therapy.<\/jats:p><\/jats:sec><jats:sec><jats:title>Patients and Measurements<\/jats:title><jats:p>A retrospective analysis was performed on a series of 98 consecutive adult CH patients (27 males and 71 females) with a median age of 24 years (range 18\u221258). Serum TSH, FT3, FT4, <jats:sc>l<\/jats:sc>\u2010T4 dose and body weight were assessed. For comparison purposes, large series of 461 TP for thyroid cancer and 1852 EU followed at our Thyroid Clinic were used as control groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The daily weight\u2010based <jats:sc>l<\/jats:sc>\u2010T4 dose was significantly higher in CH than TP group (1.9 vs. 1.7\u2009mcg\/kg, <jats:italic>p<\/jats:italic>\u2009=\u2009.03). FT3\/FT4 ratio was significantly higher in the\u00a0EU group, intermediate in CH and lower in TP groups (0.32, 0.28 and 0.24, respectively). Linear regression analysis displayed an inverse correlation between FT4 and TSH in all the groups. An inverse correlation between FT3 and TSH was observed in the\u00a0TP group, but not in the\u00a0EU and CH group suggesting that CH patients, under replacement therapy, display biochemical thyroid parameters similar to EU subjects.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Adult CH patients require a higher daily <jats:sc>l<\/jats:sc>\u2010T4 dose than adult TP. However, the different correlation of TSH and FT3 values between CH and TP patients suggests an adaptive and different hypothalamic\u2212pituitary\u2212thyroid axis regulation that may depend on the early timing of the onset of hypothyroidism in CH.<\/jats:p><\/jats:sec>","DOI":"10.1111\/cen.14738","type":"journal-article","created":{"date-parts":[[2022,4,14]],"date-time":"2022-04-14T05:44:58Z","timestamp":1649915098000},"page":"117-122","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Different FT3\/TSH correlation in acquired and congenital hypothyroid patients reveals a different hypothalamic set\u2010point"],"prefix":"10.1111","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5151-9417","authenticated-orcid":false,"given":"Marco","family":"Russo","sequence":"first","affiliation":[{"name":"Endocrinology, Department of Clinical and Experimental Medicine, Garibaldi\u2010Nesima Medical Center University of Catania Catania Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Damiano","family":"Gullo","sequence":"additional","affiliation":[{"name":"Endocrinology, Department of Clinical and Experimental Medicine, Garibaldi\u2010Nesima Medical Center University of Catania Catania Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1021-6692","authenticated-orcid":false,"given":"Dario","family":"Tumino","sequence":"additional","affiliation":[{"name":"Endocrinology, Department of Clinical and Experimental Medicine, Garibaldi\u2010Nesima Medical Center University of Catania Catania Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniela","family":"Leonardi","sequence":"additional","affiliation":[{"name":"Endocrinology, Department of Clinical and Experimental Medicine, Garibaldi\u2010Nesima Medical Center University of Catania Catania 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