Secondary endpoints were the association between the considered variables and the implicit memory rates after general anesthesia and/or deep sedation or following only inhalational or only intravenous anesthesia maintenance regimens. In the hippocampus, extrasynaptic γ-aminobutyric acid subtype A receptors may play a particularly important role. developing an implicit memory to the total number of cohorts included in our analysis. The cellular substrates of memory blockade include an increase in neuronal inhibition by γ-aminobutyric acid subtype A receptors, a decrease in excitatory glutamatergic neurotransmission, and alterations in synaptic plasticity.Īnesthetics target different receptors and brain regions to modify the various forms of memory. Studies in human volunteers and laboratory animals have shown that the memory-blocking properties of general anesthetics depend on the specific drug, the dose, the type of memory, and the experimental paradigm, as well as the species and age of the experimental subject.
This review provides a brief summary of the acute memory-blocking properties of general anesthetics and the neuronal substrates that most likely contribute to memory loss. Thus, a major outstanding question remains: How do anesthetics produce their desirable behavioural end points at the molecular level? Understanding the mechanisms underlying memory blockade is of particular importance, because some patients experience the unexpected recall of events during anesthesia while others experience persistent memory deficits in the postoperative period. Today's general anesthetics were developed empirically according to their ability to produce memory blockade, analgesia, immobility, and unconsciousness.
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