Document Classification

Section Type: METHODS

Text: Thirty-eight patients receiving paravertebral analgesia for breast surgery received a 19-mL paravertebral bolus of levobupivacaine 0. 25 % combined with a 1-mL volume of saline (group L, 13 patients), fentanyl 50 microg (group LF, 13 patients), or clonidine 150 microg (group LC, 12 patients) followed 1 hour later by infusion of levobupivacaine 0. 1 % (L), levobupivacaine 0. 05 % with fentany l 4 microg/mL (LF), or levobupivacaine 0. 05 % with clonidine 3 microg/mL (LC), respectively.