Hainan Medical College Development Corporation

The purpose of this study was to evaluate the efficacy and safety of large fractionation radiotherapy in nasopharyngeal carcinoma patients, and to analyze whether Hypofractionated radiotherapy is not inferior to conventional radiotherapy.

This prospective, sequential dose-finding clinical observational study aims to estimate the median effective concentration (EC50) and the 95% effective concentration (EC95) of liposomal bupivacaine for ultrasound-guided femoral nerve block. Sensory and motor block endpoints are evaluated separately at 30 minutes after block placement using a modified up-and-down (sequential allocation) design, with trial termination after eight reversal points.