Perineural concentration of lidocaine is more relevant to spinal neurotoxicity than the concentration administered.
Johnson
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ME
D000779:Anesthetics, Local / Q000009:adverse effects*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008012:Lidocaine / Q000009:adverse effects*; D013116:Spinal Cord / Q000187:drug effects*
D000779:Anesthetics, Local; D008012:Lidocaine