The Influence of Head and Neck Position on the Oropharyngeal Leak Pressure Using Air-Q SP Airway

The purpose of this study is to investigate the changes of the oropharyngeal leak pressure of the air-Q self-pressurizing masked laryngeal airway in the different head and neck positions. Moreover, the adequacy of ventilation will be assessed in the different head and neck positions.

Inclusion Criteria:

• adult patients aged over 20 yrs who are scheduled for surgery under general anesthesia

Exclusion Criteria:

• anticipated difficult intubation
• body mass index more than 30 km/m2
• history of gastroesophageal reflux disease
• history of esophageal operation
• cervical spine disease
• mass in the oral cavity or neck