Aust Fam Physician
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Hypothyroidism is a common endocrine disorder that mainly affects women and the elderly. ⋯ In the Western world, hypothyroidism is most commonly caused by autoimmune chronic lymphocytic thyroiditis. The initial screening for suspected hypothyroidism is thyroid stimulating hormone (TSH). A thyroid peroxidase antibody assay is the only test required to confirm the diagnosis of autoimmune thyroiditis. Thyroid ultrasonography is only indicated if there is a concern regarding structural thyroid abnormalities. Thyroid radionucleotide scanning has no role in the work-up for hypothyroidism. Treatment is with thyroxine replacement (1.6 μg/kg lean body weight daily). Poor response to treatment may indicate poor compliance, drug interactions or impaired absorption. The significance of elevated TSH associated with thyroid hormones within normal range is controversial; thyroxine replacement may be beneficial in some cases. Unless contraindicated, iodine supplementation should be prescribed routinely in women planning a pregnancy. Where raised TSH levels are detected periconceptually or during pregnancy, specialist involvement should be sought.
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Goitre refers to an enlarged thyroid. Common causes of goitre include autoimmune disease, thyroid nodules and iodine deficiency. ⋯ Patients with goitre may be asymptomatic, or may present with compressive symptoms such as cough or dysphagia. Goitre may also present with symptoms due to associated hypothyroidism or hyperthyroidism. Thyroid stimulating hormone is the appropriate first test for all patients with goitre; if this hormone is low a radionuclide scan is helpful. Thyroid ultrasound has become an extension of physical examination and should be performed in all patients with goitre. Ultrasound can determine what nodules should be biopsied. Treatment options for goitre depend on the cause and the clinical picture and may include observation, iodine supplementation, thyroxine suppression, thionamide medication (carbimazole or propylthiouracil), radioactive iodine ablation and surgery.
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Thea, aged 63 years, presents for review after a small inferior myocardial infarction (MI) 3 months previously.