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- W4243882022 abstract "We examined whether N-methyl-d-aspartate (NMDA) receptors influence the immobilizing effect of isoflurane by a spinal or supraspinal action. We antagonized NMDA receptors by intrathecal (IT), intracerebroventricular (ICV), and IV administration of MK 801 (a noncompetitive NMDA antagonist) and measured the decrease in isoflurane minimum alveolar anesthetic concentration (MAC). We also measured MK 801 tissue concentrations in homogenates of upper and lower spinal cord, a slice of cerebral cortex, and the whole brain. IT infusion of MK 801 decreased isoflurane MAC more potently than ICV or IV infusions. The change in MAC correlated with the MK 801 concentration in the lower part of the spinal cord (P < 0.01) but not with concentrations in supraspinal tissue. The maximal effect of IT MK 801 reached a plateau without achieving anesthesia. IV doses 270-fold larger than the largest IT dose also did not produce anesthesia in the absence of isoflurane. These results suggest that the capacity of MK 801 to decrease the MAC of isoflurane results from an effect on the spinal cord but that spinal NMDA receptors provide only partial mediation of the immobility produced by isoflurane. Because neither IT nor IV MK 801 provide complete anesthesia, these findings also call into question the notion that NMDA blockade alone suffices to produce anesthesia as defined by immobility in the face of noxious stimulation." @default.
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- W4243882022 date "2003-01-01" @default.
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- W4243882022 title "Spinal N-Methyl-d-Aspartate Receptors May Contribute to the Immobilizing Action of Isoflurane" @default.
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- W4243882022 doi "https://doi.org/10.1213/00000539-200301000-00022" @default.
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