Dissociation of ACTH and cortisol in septic and non-septic ICU patients
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The increase in circulating cortisol in septic intensive care unit (ICU) patients is not accompanied by increases in plasma adrenocorticotropic hormone (ACTH) . This dissociation could be due to decreased metabolic clearance of cortisol and negative feedback inhibition of ACTH secretion . The failure to maximally suppress ACTH secretion suggests an integration of activating central stress stimuli such as increased cytokines and inhibitory glucocorticoid negative feedback [2, 3, 4].
Another possible factor is the assay specificity for measuring plasma ACTH. Current human plasma ACTH assays use a two-site immunometric technology that is highly specific for human ACTH(1–39), and does not detect active or inactive pathophysiological concentrations of fragments or precursors of ACTH [5, 6]. It seems possible that other corticotrophic forms of ACTH might be increased during critical illness and detected by one-antibody competitive binding assays (e.g., radioimmunoassay...
KeywordsHypothalamic-pituitary-adrenal axis Critical illness Adrenocorticotropin Cortisol
ASLMC ICU supervisors, nurses, and staff; Anthony DeFranco MD, Richard Battiola MD, Catherine Warner, Ashley Gehrand, and Peter Homar. This study was funded in part by the Aurora Research Institute.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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