The Articulating Oral Airway (AOA) is a novel oral airway which actively displaces the tongue, allowing for a greater cross-sectional area for mask ventilation. The investigators hypothesize that, in patients with predictors for difficult mask ventilation, the AOA will be non-inferior to the Geudel oral airway in terms of expired tidal volumes.
Difficult mask ventilation (MV) is common in the obese population and can result in patient morbidity and mortality. The Articulating Oral Airway (AOA) is a novel oral airway which actively displaces the tongue, allowing for a greater cross-sectional area for MV. The investigators hypothesize that, while using the same ventilatory pressure in neuromuscularly blocked patients with predictors for difficult mask ventilation, MV with an AOA will not result in smaller expired tidal volumes than MV with a similarly sized Guedel oral airway (GDA). In other words, the AOA will be non-inferior to the GDA in terms of expired tidal volumes.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Enrollment
58
The AOA is a novel device which actively displaces the tongue, allowing for a greater cross-sectional area for mask ventilation. The AOA will be evaluated for efficacy of mask ventilation.
The Guedel oral airway is a standard oral airway commonly used to facilitate mask ventilation. The Guedel oral airway will be evaluated for efficacy of mask ventilation.
The University of Iowa Hospital
Iowa City, Iowa, United States
Expiratory Tidal Volume (Breaths 6-10)
Measured expiratory tidal volume (from video of anesthesia monitor). Each participant had measurements collected during breaths number 6-10 after the insertion of each oral airway (GOA or AOA) with the order of first treatment randomized. The average expiratory tidal volumes reported were weight standardized per kilogram of participant's body weight, meaning the expiratory measurements were divided by the participant's weight (kg). A total of 56 patients were enrolled and randomized--28 received the Guedel Oral Airway first and 28 received the Articulated Oral Airway first. The average expiratory values are reported as outlined in table below: Guedel inserted first AOA inserted first Guedel inserted second AOA inserted second
Time frame: Measured immediately after placement of each oral airway; an average of 2-5 minutes.
Inspiratory Tidal Volume (Breaths 6-10)
Measured inspiratory tidal volume (from video of anesthesia monitor). Each participant had measurements collected during breaths number 6-10 after the insertion of each oral airway (GOA or AOA) with the order of first treatment randomized. The average inspiratory tidal volumes reported were weight-standardized per kilogram of participant's body weight, meaning the inspiratory measurements were divided by the participant's weight (kg). A total of 56 patients were enrolled and randomized--28 received the Guedel Oral Airway first and 28 received the Articulated Oral Airway first. The average inspiratory values are reported as outlined in table below: Guedel inserted first AOA inserted first Guedel inserted second AOA inserted second
Time frame: Measured immediately after placement of each oral airway; an average of 2-5 minutes.
Immediate Oropharyngeal Trauma From Oral Airway Randomized to be Placed First
After the first oral airway device was removed, it was visually inspected for the presence of blood and is reported as the number of subjects where blood was visualized on the initial airway device..
Time frame: Measured immediately after removal of first oral airway and before placing the second oral airway
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