Anesthesia and analgesia
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Anesthesia and analgesia · Jan 2007
The effects of lidocaine and bupivacaine on protein expression of cleaved caspase 3 and tyrosine phosphorylation in the rat hippocampal slice.
Severe neurologic sequelae have been reported with the use of lidocaine after spinal anesthesia. This is considered a consequence of the high concentrations reached in the cerebrospinal fluid. We have previously shown that lidocaine increases the phosphorylation of focal adhesion kinase (FAK, a nonreceptor tyrosine kinase playing a role in neuronal plasticity and cell death). ⋯ The expression of cleaved caspase 3 was increased by lidocaine, but not bupivacaine, at millimolar concentrations and was blocked by PP2. Our results indicate that millimolar concentrations of lidocaine, but not bupivacaine, increase cleaved caspase 3 expression. The role of FAK phosphorylation in this effect remains to be clarified.
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Anesthesia and analgesia · Jan 2007
Xenon blocks the induction of synaptic long-term potentiation in pain pathways in the rat spinal cord in vivo.
Xenon's (Xe) mechanisms for producing anesthesia and analgesia are not fully understood. We tested the effect of Xe equilibrated in a lipid formulation or normal saline on spinal C-fiber-evoked potentials and on the induction of synaptic long-term potentiation (LTP). ⋯ Low-dose Xe in saline 0.9% revealed no antinociceptive, but preventive, action in spinal pain pathways.