Erythrocytosis associated with hyperthyroidism: a rare case report and clinical study of possible mechanism

Endocrine Research
Xingjun LiuBingyin Shi

Abstract

To report a rare case of erythrocytosis that occurred in close association with Graves' hyperthyroidism. In order to explore the role of altered erythropoiesis in hyperthyroidism, factors related to erythropoiesis were studied in 30 patients with Graves' hyperthyroidism. The relationship between thyroid hormone level and erythrocytosis was studied in a patient with Graves' hyperthyroidism and erythrocytosis. Later, 30 consecutive patients with proven untreated Graves' hyperthyroidism and 30 age- and sex-matched healthy controls were recruited. All patients received methimazole therapy. Erythrocyte indices, thyroid function, serum erythropoietin (EPO), and hypoxia-inducible factor-1α (HIF-1α) concentrations were measured before and after eight weeks of therapy. In our case study, erythrocytosis relapsed with elevation of thyroid hormones. Methimazole or subsequent radioiodine therapy reduced the conditions of erythrocytosis and thyroid function returned to normal. In the clinical study, erythrocyte counts, serum erythropoietin, and HIF-1α levels in the hyperthyroid group were significantly higher than those in the control subjects. All subjects were grouped together for correlation analyses and HIF-1α was shown to correlate with...Continue Reading

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