Burlacu, C L Fentanyl and clonidine as adjunctive analgesics with levobupivacaine in paravertebral analgesia for breast surgery. [electronic resource] - Anaesthesia Oct 2006 - 932-7 p. digital Publication Type: Comparative Study; Journal Article; Randomized Controlled Trial ISSN: 0003-2409 Standard No.: 10.1111/j.1365-2044.2006.04793.x doi Subjects--Topical Terms: AdultAgedAnalgesia, Patient-ControlledAnalgesicsAnalgesics, OpioidBreast Neoplasms--surgeryBupivacaine--analogs & derivativesClonidineDouble-Blind MethodDrug CombinationsFemaleFentanylHumansLevobupivacaineMastectomyMiddle AgedMorphine--administration & dosageNerve Block--methodsPain Measurement--methodsPain, Postoperative--prevention & control