Abstract
ACTH stimulation is useful in assessing the hypothalamo-pituitary-adrenal axis. However, there is still some debate about the proper dose and interpretation. We designed a new protocol using repetitive graded ACTH stimulation. Thirty-two patients with the diagnosis of adrenal insufficiency (AI) were studied. After taking samples for baseline ACTH and cortisol, 1 μg fresh-prepared ACTH (Synacthen (1–24)) was injected intravenously, then 5, 50 and 100 μg at hourly interval. Cortisol responses were measured at 30, 60, 120, 180 and 240 min. The secondary AI group (26 subjects) had cortisol responses in between those of the control group (8 subjects) and the primary AI group (6 subjects). The minimal overlap between the secondary AI group and the control group occurred at a 30-min cortisol response after 1 μg ACTH stimulation, using 20 μg/dl as the cut-off level. There was only one exception which showed an episodic release at 30 min. There were 5, 10 and 9 patients with secondary AI who responsed normally to 5, 50 and 100 μg ACTH stimulation, respectively. Maximal cortisol increments of the primary AI group were all below 4 μg/dl. Although there were 11 cases of secondary AI whose cortisol responses overlapped with those of primary AI, only two of them had a cortisol increment less than 4 μg/dl. Our new protocol combines the advantage of the low dose ACTH stimulation test, a sensitive method for detecting mild AI, and the ACTH infusion test, a longer test to mimic surgical stress.
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Huang, TS., Jiang, Y.D. Repetitive graded ACTH stimulation test for adrenal insufficiency. J Endocrinol Invest 23, 163–169 (2000). https://doi.org/10.1007/BF03343700
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DOI: https://doi.org/10.1007/BF03343700