Anesthesia methods
CAVITY
Patients were routinely fasted for 8 h and abstained from drinking for 6 h. After entering the operating room, an intravenous catheter was inserted into a peripheral vein, and their electrocardiogram (ECG), heart rate (HR), blood pressure (BP), oxygen saturation (SpOBlind insertion manoeuvre: briefly, the anesthesiologist held the distal end of the ventilation tube and let the SaCoVLM™ slide down the palatopharyngeal curve along midline in the mouth, until the front end of the SaCoVLM™ was inserted into the hypopharyngeal cavity, feeling an obvious resistance. Then, the cuff was inflated to 60 cmHUp-down optimized glottic exposure manoeuver: in brief, the anesthesiologist placed the VLM in a semi-inflated state(Internal pressure of capsule < 60 cmH