2.3. Application of General Anesthesia and Monitoring
All patients were instructed to fast for at least 8 h before surgery. No premedication was given. When the patient was in the anesthesia room, their head was placed on a soft, 7 cm high pillow before the induction of anesthesia, with their neck flexed and head extended. The patients were connected to electrocardiography, noninvasive blood pressure measurement, peripheral pulse oximeter, end-tidal carbon dioxide (EtCOEach patient was randomly assigned to one of three groups, Group P (pLMA, 