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How do general anesthetics differ from local anesthetics?
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General anesthetics and local anesthetics differ primarily in their scope of action and their effect on consciousness.
- General Anesthetics: These agents act on the central nervous system to induce a temporary, reversible loss of consciousness throughout the entire body. They are typically administered via inhalation or intravenous injection and are used to facilitate major surgical procedures by suppressing sensory responsiveness and pain.123
- Local Anesthetics: These agents provide restricted anesthesia by blocking the conduction of nerve impulses in a specific, limited area of the body. By preventing the movement of sodium ions through ion channels in nerve membranes, they temporarily stop pain signals from reaching the brain without causing a loss of consciousness. They are commonly administered via injection near nerves or applied topically to mucous membranes for minor procedures.412
While general anesthesia affects the brain to render the patient unconscious, local anesthesia targets peripheral nerves to numb only the site of the procedure.412