Horner syndrome during lumbar epidural analgesia for obstetrics.

Horner syndrome (ptosis, miosis, anhidrosis, and facial and conjunctival vasodilation) is a recognized complication of lumbar epidural analgesia for labor and delivery. Alone, it presents no significant risk to mother or fetus, as resolution is spontaneous and complete. Horner syndrome may, however, be associated with significant maternal hypotension and therefore should be an indication for close maternal and fetal monitoring to provide reassurance.