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• W2057896118 abstract "The analgesic properties of alpha(2)-agonists are well known. In experimental models, tumor necrosis factor (TNF)-alpha regulates adrenergic responses in the brain. Constitutive TNF-alpha, in brain regions involved in pain perception, is decreased after the administration of clonidine. We investigated patients undergoing lower-extremity revascularization. Seven patients were treated with clonidine 0.2 mg per os (low), and three patients received 0.4 mg per os clonidine (high) before surgery. Eight patients received placebo and served as controls. Continuous spinal anesthesia was provided by insertion of a pliable catheter into the subarachnoid space. Baseline plasma and cerebrospinal fluid (CSF) samples were obtained before injection of local anesthetic. Samples were analyzed for TNF-alpha using a biologic assay. Systemic and central release of catecholamines were assessed by high-pressure liquid chromatography measurement of norepinephrine in plasma and CSF, vanillylmandelic acid and methoxy hydroxyl phenyl glycol in 24-h urinary excretion, respectively. Clonidine 0.2 mg pretreatment decreased TNF-alpha concentrations both in plasma and CSF. Patients receiving clonidine had lower pain visual analog scale scores and required less morphine compared with the Placebo group (P < 0.01). Preoperative administration of clonidine decreased catecholamine release in the periphery, as well as in the central nervous system. A smaller norepinephrine concentration in plasma and CSF, and less secretion of vanillylmandelic acid (P < 0.01) and methoxy hydroxyl phenyl glycol in the urine, were observed. Larger dose clonidine (0.4 mg) resulted in no detectable TNF-alpha in CSF. These results suggest that an interaction between TNF-alpha and the function of adrenergic neurons in the central nervous system may contribute to the sedative and analgesic effects of adrenergic agonists.Preoperative administration of clonidine decreases both plasma and cerebrospinal fluid concentrations of inflammatory cytokines, resulting in perioperative analgesia and decreased sympathetic tone." @default.
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• W2057896118 date "2001-08-01" @default.
• W2057896118 modified "2023-10-15" @default.
• W2057896118 title "Clonidine Suppresses Plasma and Cerebrospinal Fluid Concentrations of TNF-α During the Perioperative Period" @default.
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• W2057896118 doi "https://doi.org/10.1097/00000539-200108000-00026" @default.
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