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[ACTH in the dexamethasone suppression test].

E Jungmann, F Schulz, W Magnet

    Medizinische Klinik (Praxis-Ausg.)
    |January 1, 1982
    PubMed
    Summary
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    Dexamethasone suppresses cortisol rhythm but not morning ACTH levels in normal subjects. Basal ACTH is biologically inactive and not suppressed by dexamethasone, suggesting its measurement is best during stimulation tests for hypercortisolism diagnosis.

    Area of Science:

    • Endocrinology
    • Hormone Regulation
    • Clinical Diagnostics

    Background:

    • The low-dose dexamethasone suppression test and plasma ACTH measurements are clinically vital.
    • Limited understanding exists regarding ACTH response to dexamethasone in healthy individuals.

    Purpose of the Study:

    • To investigate the ACTH response to dexamethasone in normal subjects.
    • To assess the impact of dexamethasone on cortisol and ACTH rhythms.
    • To evaluate cortisol response to ACTH stimulation before and after dexamethasone administration.

    Main Methods:

    • Radioimmunoassay was used to determine cortisol and ACTH levels.
    • Measurements were taken in normal subjects at 8:00 a.m., 10:00 a.m., and noon.
    • Cortisol response to ACTH stimulation was tested before and after dexamethasone.

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    Main Results:

    • Morning ACTH concentrations exhibited periodicity similar to cortisol's circadian rhythm.
    • Dexamethasone blocked this ACTH periodicity without significant ACTH reduction.
    • Cortisol response to ACTH stimulation remained normal post-dexamethasone.
    • Morning ACTH appears basal, biologically inactive, and resistant to dexamethasone suppression.

    Conclusions:

    • Dexamethasone impacts cortisol rhythm but not basal morning ACTH levels in healthy individuals.
    • Basal morning ACTH is likely biologically inactive and not further suppressed by dexamethasone.
    • Measuring ACTH during stimulation tests (e.g., insulin-induced hypoglycemia) is recommended for diagnosing hypercortisolism.