1.3.4 PCEA specifications 1.3.5 Unwanted effects 1.3.6 Some PCEA devices 1.4 Ropivacaine anesthetics 1.5 Some studies on PCEA 1.5.1 In Vietnam 4 In 2017, the author Pham Xuan Hung performed the evaluat ion of the effectiveness of epidural analgesia for patients after hip surgery of the levobupivacaine mixture with fentanyl.