Retrobulbar Block in Pediatric Vitreoretinal Surgery Eliminates the Need for Intraoperative Fentanyl and Postoperative Analgesia: A Randomized Controlled Study.

Background and Objectives: Pediatric ophthalmologic surgery is traditionally accomplished by general anesthesia with opioids, but respiratory depression remains a major concern. Our study compared the efficacy of retrobulbar block with systemic fentanyl on pain, hemodynamic, and stress response in pediatric vitreoretinal surgery. Methods: A prospective double-blind, randomized controlled study was performed comparing retrobulbar block with intravenously administered fentanyl in 28 children aged 1 to 6 years undergoing vitreoretinal surgery. After general anesthesia was induced, retrobulbar block with 0.5% ropivacaine was accomplished in group RB (general anesthesia plus retrobulbar block) (n = 13), and normal saline was injected into retrobulbar space in group F (general anesthesia alone) (n = 15). Fentanyl 0.5 [mu]g/kg was administered when signs of inadequate anesthesia were observed. Results: Respiratory depression (defined as a persistent respiratory rate

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