Clinical Research Directory

Inclusion Criteria: * Adult patients aged 19 and above. * Patients scheduled for general anesthesia for elective surgery. * American society of anesthesiologists physical status classification 1 or 2 Exclusion Criteria: * Individuals who have not provided prior consent for participation in the study * Patients showing cognitive impairment to the extent that voluntary consent is difficult * Obesity with a BMI of 30 kg/m² or higher * Patients with anatomical abnormalities in the airway structure making supraglottic airway device application difficult * Patients with respiratory diseases making PEEP application difficult (e.g., chronic obstructive pulmonary disease, asthma) * Patients suspected of delayed gastric emptying (e.g., not adhering to fasting guidelines, medication use affecting gastric motility \[anticholinergics, narcotic analgesics\], neurological disorders \[Parkinson's disease, multiple sclerosis\], diabetes, hypothyroidism) * Patients with a history of gastrointestinal surgery * Pregnant women * Patients undergoing concurrent surgeries or collaborative procedures * Patients transferred from the intensive care unit