The aim of this randomized , single blind phase IIIb study was to evaluate the efficacy of 0.5 % levobupivacaine versus 0.5 % bupivacaine and 0.75 % ropivacaine administered as epidural anesthesia and 0.125 % levobupivacaine versus 0.125 % bupivacaine and 0.2 % ropivacaine for postoperative analgesia .
