Why can patients remain conscious during regional nerve block anesthesia?

Patients remain conscious during regional nerve block anesthesia because the medication is administered locally to specific nerve trunks rather than affecting the central nervous system or the brain.1

Unlike general anesthesia, which induces a state of unconsciousness by acting on the brain, local anesthetics work by temporarily blocking the conduction of nerve impulses along sensory and motor fibers at the site of injection. By preventing the movement of sodium ions through ion channels in the nerve membrane, the drug stops the transmission of pain signals from the surgical area to the brain. Because the anesthetic is confined to a limited region—such as a limb or a specific level of the spinal cord—the patient’s higher brain centers remain unaffected, allowing them to stay awake throughout the procedure.1