Iijima, Tetsuya A comparison of three different concentrations of ropivacaine with fentanyl for patient-controlled epidural analgesia. [electronic resource] - Anesthesia and analgesia Aug 2007 - 507-11 p. digital Publication Type: Comparative Study; Journal Article; Randomized Controlled Trial ISSN: 1526-7598 Standard No.: 10.1213/01.ane.0000269491.04233.3b doi Subjects--Topical Terms: AdultAmides--administration & dosageAnalgesia, Epidural--methodsAnalgesia, Patient-Controlled--methodsChemistry, PharmaceuticalDouble-Blind MethodDrug Therapy, CombinationFemaleFentanyl--administration & dosageHumansMiddle AgedPain, Postoperative--epidemiologyRopivacaine