Abstract:Objective: To explore the mechanism of catecholamine release type on glucose intolerance in patients with pheochromocytoma. Methods: We evaluated 57 patients who were diagnosed as having pheochromocytoma and underwent surgical resection. Patients were divided into normal glucose tolerance group and abnormal glucose tolerance group. The blood glucose parameters, insulin secretion parameters (HOMA-β), insulin resistance parameters (HOMA-IR) before and after operation, and 24-h urine metanephrine and urine normetanephrine were analyzed. Results: The mean preoperative systolic blood pressure in the impaired glucose tolerance group was higher than that in the normal glucose tolerance group. After operation, FBG, HbA1c, HOMA-β and HOMA-IR in impaired glucose tolerance group were significantly improved. Spearman correlation analysis showed that the improvement of HOMA-β before and after operation was positively correlated with the improvement of urinary metanephrine, and the improvement of HOMA-IR before and after operation was positively correlated with the improvement of urinary normetanephrine. Conclusion: The removal of pheochromocytoma improved blood glucose parameters in patients with impaired glucose tolerance, and the mechanisms of glucose tolerance induced by different catecholamines were different. The increase of adrenaline mainly affects the decrease of insulin secretion, while the increase of noradrenaline mainly affects insulin resistance.
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