Feasibility and Accuracy of Core Temperature Measurements Using the Esophageal Temperature Probe Inserted Through the Gastric Lumen of Supraglottic Airway Device in Pediatrics

Inclusion Criteria: * Pediatrics patients under six years old with ASA PS 1-3 * Patients undergoing general anesthesia using the Supraglottic airway device * Patient's weight: 10-30kg Exclusion Criteria: * Patients who refused to participate in the study * Patients with tumors in the esophagus or esophageal varices * Patients with a monitoring device inserted through the esophagus during surgery * Patients with ear inflammation * Patients with congenital anomaly in the rectum * Patients judged unfit to participate in the study by medical staff for other reasons