Efficacy of Flurbiprofen Spray for Postoperative Sore Throat Following Double-Lumen Endobronchial Intubation

Topical administration of flurbiprofen 8.75 mg spray applied directly to the tracheal and bronchial cuffs of the double-lumen endobronchial tube before intubation. A total of three sprays will be applied: one spray to the bronchial cuff and two sprays to the tracheal cuff, immediately before intubation.

Topical administration of placebo spray (0.9% normal saline) applied in the same manner as the active intervention, with one spray to the bronchial cuff and two sprays to the tracheal cuff of the double-lumen tube before intubation.