Risk of Gastric Reflux During Tulip vs GMA(Glottis Mask Airway) Airway

Comparison of Risk of Gastroesophageal Reflux During General Anesthesia With Tulip vs GMA(Glottis Mask Airway) Airway

Glottis mask airway (GMA) is supraglottic airway device and is frequently used in patients undergoing general anesthesia. However, gastroesophageal reflux remains a risk during ventilation through supraglottic airway devices. The classical shaped GMA and tulip shaped GMA differ in the shape of their tips. And theoretically the tulip shaped tip fits the larynx better. This study aims to compare the incidence of gastroesophageal reflux during ventilation through classical shaped vs tulip shaped glottis mask airway.

Inclusion Criteria:

• age≥18 years old
• scheduled for surgery under general anesthesia with laryngeal mask airway

Exclusion Criteria:

• American society of anesthesiologists status score higher than 3
• morbid obesity (body mass index higher than 40 kg/m2)
• with high risk of gastroesophageal reflux
• with risk of difficult airway
• with airway disease