Iodine metabolism and thyroid hormones in blood were studied in 19 men and 11 women who had been treated with thiazides for arterial hypertension from 1 month to 15 years. The results were compared with the findings from age-matched normal controls. No differences were found regarding 24-h 131I-thyroid uptake, thyroid iodide clearance, renal iodide clearance, plasma inorganic iodide, absolute iodine uptake (AIU), serum thyroxine (T4 (D)), resin T3 test (T3U) and TSH after TRH. Twenty-four-hour urinary iodine was higher in the patients treated with diuretics which could be explained by increased iodine intake. The findings of increased serum triiodothyronine (T3 (RIA)) and reverse T3 (rT3) might be due to changes in distribution volume in the thiazide-treated patients. Long-term treatment with thiazides in man do not lead to iodine depletion.
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