Auriculopalpebral nerve block lasts approximately how long when using 1-2 cc carbocaine?

• A. 1-3 h
• B. 4-6 h
• C. 8-12 h
• D. 24 h

Answer: (A)

The block lasts about 1–3 hours. The auriculopalpebral nerve block is aimed at motor fibers to the eyelids, so it temporarily immobilizes the lids to facilitate examination without affecting corneal sensation. Carbocaine (mepivacaine) is a medium-acting local anesthetic, and when used in a small volume (1–2 cc) around this nerve, the palpebral paralysis typically persists in the 1–3 hour range. Longer durations (4–6, 8–12, or 24 hours) would require a longer-acting agent or additives; with this dose and agent, that extended duration isn’t expected. Also, remember this block does not provide analgesia to the cornea, which would require a separate sensory block if needed.