Comparison of the Impacts of Sugammadex With Neostigmine on Patency of Laryngeal Opening (Glottic Aperture Angle)

Inclusion Criteria: 1\. Adult patients who undergoes elective surgery under general anesthesia with supraglottic airway device. Exclusion Criteria: 1. Patients under 20 years old 2. Pregnant women 3. Patients who can not read the consent form or are not fluent in Korean (illiterate, foreigner) 4. Patients who refused the clinical trial 5. Patients with dementia or cognitive impairment 6. Patients with neuromuscular disorders impairing neuromuscular blockade 7. Renal dysfunction (estimated Glomerular Filtration Rate less than 30 ml/min/1.73m2) 8. Past history of allergic reactions to neostigmine or sugammadex 9. Patients with ASA class IV or higher 10. Robotic surgery, adenoid or tonsillectomy 11. Patients with moderate or severe asthma, pulmonary function tests with forced expiratory volume for 1second of 1 liter or less, patients with upper respiratory infection symptoms within 2 weeks before surgery, current smokers (within 1 month of smoking cessation is included.)