{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T07:34:00Z","timestamp":1782286440126,"version":"3.54.5"},"reference-count":20,"publisher":"BMJ","issue":"1","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2020,12,7]]},"published-print":{"date-parts":[[2021,1]]},"abstract":"<jats:p>The authors present a case of a 55-year-old gentleman with a medical history of atrial fibrillation on amiodarone who presented with weight loss, palpitations and exertional dyspnoea. Thyroid function tests revealed thyrotoxicosis with a free thyroxine (T4) of 117\u2009pmol\/L and a thyroid-stimulating hormone (TSH) of &lt;0.008\u2009mIU\/L. Interleukin-6 level was low. The negative TSH-receptor antibody status, the presence of a small thyroid gland with heterogeneous echotexture and decreased internal vascularity on ultrasound together with the relatively quick drop in free T4 and free tri-iodothyronine (T3) levels once prednisolone therapy was added to carbimazole suggested that this was typical of amiodarone-induced thyrotoxicosis (AIT) type 2. Subsequently, carbimazole was discontinued and treatment with prednisolone was continued. This case highlights that AIT management may be challenging and it is of paramount importance to establish the type of AIT present as this will guide management and is key to improving prognosis.<\/jats:p>","DOI":"10.1136\/bcr-2020-238145","type":"journal-article","created":{"date-parts":[[2021,1,8]],"date-time":"2021-01-08T13:40:26Z","timestamp":1610113226000},"page":"e238145","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":6,"title":["Amiodarone-induced type 2 thyrotoxicosis"],"prefix":"10.1136","volume":"14","author":[{"given":"Darryl","family":"Portelli","sequence":"first","affiliation":[{"name":"Department of Medicine, Mater Dei Hospital, Msida, Malta"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simon","family":"Mifsud","sequence":"additional","affiliation":[{"name":"Department of Diabetes and Endocrinology, Mater Dei Hospital, Msida, Malta"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexia","family":"Abela","sequence":"additional","affiliation":[{"name":"Department of Diabetes and Endocrinology, Mater Dei Hospital, Msida, Malta"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen","family":"Fava","sequence":"additional","affiliation":[{"name":"Department of Diabetes and Endocrinology, Mater Dei Hospital, Msida, Malta"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2021,1,8]]},"reference":[{"key":"2025082703223668000_14.1.e238145.1","doi-asserted-by":"publisher","DOI":"10.1136\/pmj.76.893.133"},{"key":"2025082703223668000_14.1.e238145.2","doi-asserted-by":"publisher","DOI":"10.1177\/2042018811398516"},{"key":"2025082703223668000_14.1.e238145.3","doi-asserted-by":"publisher","DOI":"10.1016\/S0828-282X(09)70512-4"},{"key":"2025082703223668000_14.1.e238145.4","doi-asserted-by":"publisher","DOI":"10.1210\/en.2010-0553"},{"key":"2025082703223668000_14.1.e238145.5","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1111\/j.1365-2265.1985.tb03238.x","article-title":"Amiodarone and thyroid hormone action","volume":"22","author":"Franklyn","year":"1985","journal-title":"Clin Endocrinol"},{"key":"2025082703223668000_14.1.e238145.6","doi-asserted-by":"publisher","DOI":"10.1210\/er.22.2.240"},{"key":"2025082703223668000_14.1.e238145.7","doi-asserted-by":"crossref","first-page":"319","DOI":"10.18295\/2075-0528.2808","article-title":"A case of amiodarone-induced thyrotoxicosis","volume":"9","author":"Sudheer Ahamed","year":"2009","journal-title":"Sultan Qaboos Univ Med J"},{"key":"2025082703223668000_14.1.e238145.8","unstructured":"Ursella S , Testa A , Mazzone M , et al . 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