The influence of different head and neck positions on the effectiveness of ventilation with the Ambu AuraGain airway remains unevaluated. This study aimed to evaluate the influence of different head and neck positions on ventilation with the AuraGain airway. AuraGain will be placed in all patients, and mechanical ventilation will be performed using a volume-controlled mode with a tidal volume of 10 ml/kg. The expiratory tidal volume, peak inspiratory pressure, oropharyngeal leak pressure, and ventilation score will be assessed first for the neutral head position and then for the extended, flexed, and rotated head positions in a random order. Fiberoptic bronchoscopic view will be also assessed for each head and neck positions.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Enrollment
40
After changing the position of head and neck of subjects to flexion, the variables were measured.
After changing the position of head and neck of subjects to extension, the variables were measured.
After changing the position of head and neck of subjects to right flexion, the variables were measured.
Seoul National University Hospital
Seoul, South Korea
Oropharyngeal leak pressure
The airway pressure at which a leak sound is detected around the patient's mouth and at which the airway pressure has reached equilibrium, when the pressure-limiting valve of the anesthesia breathing system is closed and the fresh gas flow rate was fixed at 3 L/min.
Time frame: 30 seconds after positioning of head and neck
Peak inspiratory pressure
Peak inspiratory pressure
Time frame: 30 seconds after positioning of head and neck
Expiratory tidal volume
Expiratory tidal volume
Time frame: 30 seconds after positioning of head and neck
Ventilation score
No leakage with an airway pressure of 15cmH2O; bilateral chest excursion with a peak inspiratory pressure of 20cmH2O; and a square-wave capnogram
Time frame: 30 seconds after positioning of head and neck
Fiberoptic score
1, vocal cords not visible; 2, vocal cords plus anterior epiglottis visible; 3, vocal cords plus posterior epiglottis visible; 4, only vocal cords visible
Time frame: 30 seconds after positioning of head and neck
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