“…After entering the room, the venous access was routinely opened. Anaesthesia induction in patients was the same: midazolam 0.05 mg/kg, sufentanil 0.5 µg/kg, propofol 1.0–2.0 mg/kg, and rocuronium 0.6 mg/kg [ 7 , 8 ]. After 3 min, an appropriate type of DLT was selected, and the anaesthesia intubation operation was performed by an anaesthesiologist with the same amount of experience.…”