Differential sensitivity of A and C nerve fibres to long-acting amide local anaesthetics.
The differential sensitivities of A beta, A delta and C fibres of rat vagus nerve to bupivacaine, etidocaine and AL-381 were studied in vitro. In A beta fibres, at 35-37 degrees C, 50 mumole litre-1 of the drugs had similar effects on the action potential amplitude, while at greater concentrations (100 and 200 mumole litre-1) the greatest mean depression of amplitude was seen with etidocaine (n.s.). AL-381 had the most marked effect on the A delta potentials, and it appeared that it was about twice as potent as the others in blocking these fibres. Etidocaine 100 mumole litre-1 was more depressant than the same dose of bupivacaine. The C fibres were blocked most rapidly by AL-381, while etidocaine had the least effect.
D000200:Action Potentials / Q000187:drug effects; D000577:Amides / Q000494:pharmacology; D000779:Anesthetics, Local / Q000494:pharmacology*; D000818:Animals; D002045:Bupivacaine / Q000494:pharmacology; D005041:Etidocaine / Q000494:pharmacology; D066298:In Vitro Techniques; D009407:Nerve Block; D009412:Nerve Fibers / Q000187:drug effects*; D009413:Nerve Fibers, Myelinated / Q000187:drug effects*; D010791:Phrenic Nerve / Q000187:drug effects; D051381:Rats; D011919:Rats, Inbred Strains; D000077212:Ropivacaine; D014630:Vagus Nerve / Q000187:drug effects
D000577:Amides; D000779:Anesthetics, Local; D000077212:Ropivacaine; D005041:Etidocaine; D002045:Bupivacaine