Comparison of alfentanil and sufentanil on extubation-related cough following suspension laryngoscopy surgery: a randomized controlled trial.

Were randomly allocated to receive either alfentanil (Group A, n = 42; The induction dose for general anesthesia is 21 μg/kg, and maintenance 0.7-1.4 μg·kg -1 ·min -1 ) or sufentanil (Group S, n = 38; The induction dose for general anesthesia is 0.3 μg/kg, and maintenance 0.01-0.02 μg·kg -1 ·min -1 ), both combined with propofol 2-4 μg·mL -1 target-controlled infusion.