The results indicate that clinically relevant cardiotoxic concentrations of bupivacaine and levobupivacaine markedly depress cardiac sympathetic neurotransmission. A possible mechanism of local anesthetics in reducing evoked norepinephrine release from sympathetic endings is blockade of tetrodotoxin-sensitive fast sodium channels.
In this study, two concentrations of lidocaine are compared as spinal anesthetics in 51 male patients undergoing inguinal hernia repair. Patients were assessed for the onset, quality, and duration of the spinal block. The study results indicate that 1.5% lidocaine is as effective as the 5% solution as a spinal anesthetic for patients undergoing inguinal hernia repair.
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