title: Clinical hyperthyroidism due to non-neoplastic inappropriate thyrotrophin secretion.
abstract: We report a case of hyperthyroidism due to inappropriate thyrotrophin (TSH) secretion in a patient with selective pituitary resistance to thyroid hormone action. Symptoms of hyperthyroidism in patients with this disorder are usually mild, implying some peripheral tissue resistance to the metabolic effects of thyroid hormone. Our patient had unusually severe symptoms, including marked weight loss and cardiac arrythmias which required carbimazole and beta-blocker therapy for control. Somatostatin was ineffective in suppressing TSH secretion. The introduction of sensitive thyrotrophin assays should facilitate the accurate diagnosis of TSH-induced hyperthyroidism and avoid inappropriate treatment.
authors.affiliation: Department of Endocrinology, Walton Hospital, Liverpool, UK.
authors.forename: A W
authors.initials: AW
authors.lastname: Chan
authors.forename: I A
authors.initials: IA
authors.lastname: MacFarlane
authors.forename: C
authors.initials: C
authors.lastname: van Heyningen
authors.forename: P M
authors.initials: PM
authors.lastname: Foy
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D006980:Hyperthyroidism / Q000209:etiology*; D007177:Inappropriate ADH Syndrome / Q000097:blood / Q000150:complications* / Q000188:drug therapy; D013972:Thyrotropin / Q000097:blood
chemical_list: D013972:Thyrotropin