title: Hypothyroidism, an important cause of reversible hyperlipidemia.
abstract: Primary hypothyroidism was found to be the cause of hyperlipidemia in 22 patients. The mean age was 46 years, 59% were males, 27% had vascular disease, 14% had xanthomas and 86% had thyroid antibodies. Familial involvement was shown in 3 propositi. All patients were treated with L-thyroxine, 0.05--0.2 mg/day for a mean of 16 months. Combined hyperlipidemia was common (77%), and lipoprotein phenotyping revealed types IIB hyperlipopro-teinemia in 11, IIA in 5, III in 3 and IV in 3 patients. With treatment, normal plasma cholesterol (less than 265 mg/dl) and triglycerides (less than 200 mg/dl) were obtained in 91% and 86%, respectively. The mean maintenance L-thyroxine dose was 0.15 mg/day, but smaller doses often showed marked hypolipidemic effect. The mean +/- S. D. pretreatment fasting plasma cholesterol and triglycerides were 387 +/- 120 and 328 +/-247 mg/dl and on thyroid treatment the mean minimum levels were 205 +/- 46 and 133 +/- 65 mg/dl, respectively (both p values less than 0.005). Hypothyroidism has proved to be a common reversible form of hyperlipidemia. One cardiac patient died and three others had to have their L-thyroxine titrated to prevent angina. Family screening has been of use in case finding for auto-immune disease in 3 families.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002784:Cholesterol / Q000097:blood; D005260:Female; D006801:Humans; D006949:Hyperlipidemias / Q000097:blood / Q000188:drug therapy / Q000209:etiology*; D007037:Hypothyroidism / Q000097:blood / Q000150:complications* / Q000628:therapy; D008055:Lipids / Q000097:blood; D008297:Male; D008875:Middle Aged; D013974:Thyroxine / Q000097:blood / Q000627:therapeutic use; D013997:Time Factors; D014280:Triglycerides / Q000097:blood
chemical_list: D008055:Lipids; D014280:Triglycerides; D002784:Cholesterol; D013974:Thyroxine