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• W2015447096 abstract "Anesthetic endpoints of unconsciousness and immobility result from agent effects on both brain and spinal cord that are difficult to separate during systemic administration. To investigate cerebral mechanism of anesthetic-induced unconsciousness, the authors studied behavioral and electrophysiologic effects of four anesthetics infused intracerebroventricularly to conscious rats. The authors aimed to produce progressively increasing anesthetic depths, indicated by electro-encephalographic synchronization and behavioral change.During anesthesia, rats were equipped with intracerebroventricular infusion catheters, hind-paw stimulation, and epidural electrodes to record the electroencephalogram from the somatosensory cortex. Silicone bolus was injected into the fourth ventricle to minimize drug distribution to the spinal cord. 60 min later, 50-min infusion of pentobarbital (6.0 mg/h), fentanyl (0.75 microg/h), propofol (3.0 mg/h), or midazolam (0.24 mg/h) was initiated. Vibrissal, olfactory, corneal, and tail-pinch responses were tested every 10 min.All agents depressed vibrissal, olfactory, and corneal responses; propofol and pentobarbital produced the strongest effect. All agents except propofol depressed tail-pinch response; fentanyl and pentobarbital produced the strongest effect. All agents except midazolam increased delta power. Pentobarbital enhanced theta power. All agents except fentanyl enhanced alpha and beta power. Pentobarbital and midazolam slightly increased, whereas fentanyl decreased, gamma power. Pentobarbital increased and midazolam decreased somatosensory evoked potential; these changes were small and apparently unrelated to behavior.Alpha and beta power increase may reflect sedative component of anesthesia. Simultaneous delta, alpha, and beta power increase may correlate with loss of consciousness. Theta and delta power increase may reflect surgical anesthesia. Opioid-induced gamma power decrease may reflect suppression of pain perception. Pentobarbital-, fentanyl-, and midazolam-induced immobility to noxious stimulation may be mediated supraspinally." @default.
• W2015447096 created "2016-06-24" @default.
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• W2015447096 date "2006-10-01" @default.
• W2015447096 modified "2023-10-18" @default.
• W2015447096 title "Supraspinal Anesthesia" @default.
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• W2015447096 doi "https://doi.org/10.1097/00000542-200610000-00023" @default.
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