Randomized Controlled Trial
Prolonged epidural infusions of ropivacaine (2 mg/mL) after colonic surgery: the impact of adding fentanyl.
Anesth. Analg. 2001 May 1;92(5):1276-85.
Randomized Controlled Trial
Intraoperative epidural anesthesia and postoperative analgesia with levobupivacaine for major orthopedic surgery: a double-blind, randomized comparison of racemic bupivacaine and ropivacaine.
J Clin Anesth. 2003 Mar 1;15(2):126-31.
Randomized Controlled Trial
Subtenon block compared to intravenous fentanyl for perioperative analgesia in pediatric cataract surgery.
Anesth. Analg. 2009 Apr 1;108(4):1132-8.