GMA-Tulip, I-gel and the LMA-Supreme (LMA-S) Devices in Airway Management (GLAM-I)

GMA-Tulip, I-gel and the LMA-Supreme (LMA-S) Devices in Airway Management Under General Anesthesia, a Randomized Controlled Study (GLAM-I)

Patients were randomly assigned to three supraglottic airway devices (SADs) groups for airway management after anesthesia induced. Fiberoptic bronchoscope (FB) guided glottic exposure grading was performed and other airway management quality was recorded.

Mechanical ventilation was volume controlled and time cycled with tidal volumes (6-8 ml/kg) set to maintain peak inspiratory pressures of less than 20 cm H2O and ventilatory frequency adjusted to maintain end-tidal carbon dioxide (PETCO2) at 35-45 mmHg. Then a fiberoptic bronchoscope was passed through airway tube into the device to perform glottic exposure grading. Peak airway pressure, incidence of pharyngalgia, bleeding, hoarseness, and dysphagia were recorded.

Inclusion Criteria:

• 18-75 years old;
• American Society of Anesthesiologists (ASA) I-III;
• Body mass index (BMI)<30Kg/m2;
• Scheduled for elective breast or lower abdominal surgery with an estimated duration of less than 4 hours;
• Providing written inform consent.

Exclusion Criteria:

• History of oropharyngeal surgery and anatomical abnormalities;
• Limited movement of the cervical spine;
• High risk of reflux/aspiration;
• Emergency surgery;
• Acute throat inflammation and upper respiratory infection;
• History of chronic bronchitis or asthma;
• Cognitive dysfunction and inability to communicate;
• Participating in other clinical trials.