The mechanism of action of ketamine on the myelinated nerve membrane.
Ketamine is an intravenous anaesthetic that has been reported to react with a number of synaptic and non-synaptic receptors at both the spinal and supraspinal level. The present investigation was undertaken to analyse the effects of ketamine on the myelinated axon under voltage clamp conditions. Both sodium and potassium channels were affected. The effect may be described as mainly a reduction of the permeability constants. No effect on inactivation was observed. The effects were described by a first order binding to receptors within the ion channels that may be identical with the receptors for other anaesthetics. It was concluded from experiments with naloxone that no opiate receptors were involved in the axonal ketamine effects.
D000818:Animals; D001369:Axons / Q000187:drug effects / Q000378:metabolism; D002463:Cell Membrane Permeability / Q000187:drug effects; D066298:In Vitro Techniques; D007473:Ion Channels / Q000187:drug effects; D007649:Ketamine / Q000494:pharmacology*; D009186:Myelin Sheath / Q000187:drug effects* / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D011957:Receptors, Opioid / Q000187:drug effects; D012964:Sodium / Q000378:metabolism; D014982:Xenopus laevis
D007473:Ion Channels; D011957:Receptors, Opioid; D007649:Ketamine; D012964:Sodium; D011188:Potassium