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Abstract
Horner's syndrome is a complication of epidural analgesia and anesthesia, encountered
more commonly in pregnant women than in other patients. Previous reports described
the appearance of Horner's syndrome following epidural injection of concentrated local
anesthetic solutions. We report unilateral Horner's syndrome occurring in the setting
of lumbar epidural analgesia for labor with a very low local anesthetic concentration
(bupivacaine 0.04%) in an epidural infusion. We discuss the possible factors that
could have contributed to this occurrence despite the extremely dilute concentration
of local anesthetic used for analgesia.