New rationale for glucocorticoid treatment in septic shock.
Two recent small randomized trials evaluating a 5- to 12-day course of low dose hydrocortisone in patients with septic shock have reported a significant clinical improvement and a reduction in mortality. Recent studies indicate that an overaggressive and unregulated systemic inflammatory response is a major determinant of outcome in sepsis. In septic shock, nonsurvivors as opposed to survivors have over time: (1) significantly higher NF-kB activity in peripheral mononuclear cells, (2) persistent elevation in circulating inflammatory cytokine levels, and (3) elevated ACTH and cortisol levels. Current research recognizes that cytokines can cause a concentration-dependent resistance to endogenous glucocorticoids (GC). It is postulated that an excess of cytokine-induced transcription factors, such as NF-kB, may form complexes with activated glucocorticoid receptors (GCR), preventing GCR interaction with DNA. When T cells are incubated with a combination of cytokines, GC resistance is induced in a cytokine concentration-dependent fashion and reversed by removal of cytokines. Prolonged treatment with physiological doses of exogenous GCs may be necessary to compensate adequately for the inability of target organs to respond to endogenous cortisol and for the inability of the host to produce appropriately elevated levels of GCs. This hypothesis is supported by the laboratory findings of a recent randomized study of patients with unresolving acute respiratory disease.
Meduri
G U
GU
Division of Pulmonary and Critical Care Medicine, The University of Tennessee and Veterans Affairs Medical Center, Memphis 38163, USA.
D000324:Adrenocorticotropic Hormone / Q000097:blood / Q000494:pharmacology; D005938:Glucocorticoids / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D006854:Hydrocortisone / Q000097:blood / Q000494:pharmacology; D016328:NF-kappa B / Q000494:pharmacology; D011965:Receptors, Glucocorticoid / Q000502:physiology*; D012772:Shock, Septic / Q000188:drug therapy* / Q000503:physiopathology; D013601:T-Lymphocytes / Q000502:physiology
D005938:Glucocorticoids; D016328:NF-kappa B; D011965:Receptors, Glucocorticoid; D000324:Adrenocorticotropic Hormone; D006854:Hydrocortisone