Increased plasma concentration of atrial natriuretic factor (ANF) in untreated hyperthyroid patients is reported. A significant positive correlation between the concentration of ANF and serum thyroid hormones (T4 and T3) has been found when hyperthyroid patients and healthy controls were pooled together. The mechanism by which thyroid hormones raise plasma ANF concentration and its relevance to the symptomatology of hyperthyroidism is discussed.
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