Interventions
mouth-breathing, delirium
CAVITY, MUSCLE RELAXATION
Patients in preconditioning group underwent nasal splint preconditioning and mouth breath training in pre-anesthesia room 1 h before surgery. In details, a nasal splint (patent No. 202020982582.9, China) was used to clamp the subnasal cartilage in front of the nasal cavity to block breathing through nose (Fig. 
 A graphic summary displaying that preconditioning by nasal splint and mouth-breathing training reduces emergence delirium after FESSFor general anesthesia induction, all patients administrated midazolam (0.05 mg/kg), propofol (2 mg/kg), and sufentanil (0.25 µg/kg). Rocuronium(0.6 mg/kg) was then administered. After satisfactory muscle relaxation, tracheal intubation was carried out, followed by 60% O