AbstractIntroduction: The incidence of hyperthyroidism has been reported in various countries to be 23 - 93/100 000 inhabitants/year. This extended study has evaluated the incidence for approximately 40% of the Swedish population of 9 million inhabitants. Sweden is considered iodine sufficient.Methods: All patients including children, who were newly diagnosed with overt hyperthyroidism in the years 2003-2005, were prospectively registered in a multicenter study. Inclusion criteria: clinical symptoms and/or signs of hyperthyroidism with plasma TSH concentration below < 0.2 mIE/l, increased plasma levels of free/total T3 and/or free/total T4. Patients with relapse of hyperthyroidism or thyroiditis were not included. The diagnosis Graves' disease (GD), toxic multinodular goiter (TMNG) and solitary toxic adenoma (STA), smoking, initial treatment, occurrence of thyroid associated eye symptoms/-signs and demographic data were registered.Results: 2916 patients were diagnosed with de novo hyperthyroidism giving the total incidence of 27.6 / 100000 inhabitants/year. The incidence of GD was 21.0/100000 and toxic nodular goiter (TNG=STA + TMNG) occurred in 692 patients, corresponding to an annual incidence of 6.5 /100 000. The incidence was higher in women compared to men (4.2:1). 75% of the patients were diagnosed as GD, in whom thyroid associated eye symptoms/-signs occurred at diagnosis in every fifth patient. Geographical differences were observed. Conclusion: The incidence of hyperthyroidism in Sweden is in a lower range compared to international reports. Patients with hyperthyroidism had GD in 75% and 20% of them had thyroid associated eye symptoms/-signs at diagnosis. The observed geographical differences require further studies.
MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Endokrinologi och diabetes (hsv//swe)
MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Endocrinology and Diabetes (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin (hsv//swe)
MEDICAL AND HEALTH SCIENCES -- Clinical Medicine (hsv//eng)