Thoracic epidural analgesia via the lumbosacral approach using multiport catheters with a low concentration of bupivacaine and morphine in sheep.

Objective: To determine the analgesic and systemic effects of thoracic epidural administration of bupivacaine (BP) and morphine (MP) in conscious sheep.

Study Design: Randomized, crossover, experimental study.

Animals: Six healthy castrated sheep weighing between 40 and 50 kg.