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  • Title: Plasma immunoassayable ACTH levels during and after hydrocortisone infusion in patients with Cushing's disease.
    Author: Hashimoto K, Takahara J, Hosogi H, Yunoki S, Ofuji T.
    Journal: Endocrinol Jpn; 1976 Jun; 23(3):243-9. PubMed ID: 186258.
    Abstract:
    The plasma ACTH responses to hydrocortisone infusion were compared in patients with Cushing's disease and primary adrenocortical insufficiency. In 4 patients with primary adrenocortical insufficiency, plasma ACTH levels were suppressed exponentially after administration of a relatively large dose of hydrocortisone (1.0 mg/kg/1.5 hr-3.0 mg/kg/2 hr). In patients with post-adrenalectomized Cushing's disease (4, bilateral; 1, unilateral), plasma ACTH suppression was delayed. Plasma ACTH levels, expressed as a percentage of the basal concentrations, were significantly less suppressed in patients with Cushing's disease than in patients with primary adrenocortical insufficiency 90 (p less than 0.05) and 120 (p less than 0.05) min after the beginning of infusion. When 0.5 mg/kg hydrocortisone was infused over a period of 1.5 hr, suppression was also delayed in Cushing's disease, and plasma ACTH levels were less suppressed in 4 patients with Cushing's disease than in 4 patients with primary adrenocortical insufficiency at 30 (p greater than 0.05), 45 (p greater than 0.05) 60 (p less than 0.05) min.
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