Bonhomme, Vincent Epidural administration of low-dose morphine combined with clonidine for postoperative analgesia after lumbar disc surgery. [electronic resource] - Journal of neurosurgical anesthesiology Jan 2002 - 1-6 p. digital Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial ISSN: 0898-4921 Standard No.: 10.1097/00008506-200201000-00001 doi Subjects--Topical Terms: Adjuvants, AnesthesiaAdultAnalgesia, EpiduralAnalgesia, Patient-ControlledAnalgesics--adverse effectsAnalgesics, Opioid--adverse effectsAnesthetics, CombinedAnesthetics, LocalBupivacaineClonidine--adverse effectsDiskectomyDouble-Blind MethodFemaleHumansLumbar Vertebrae--surgeryMaleMiddle AgedMorphine--adverse effectsPain, Postoperative--therapyPirinitramideUrinary CatheterizationUrination Disorders--chemically induced