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Laryngeal Mask Airway Exchange Using a Gum Elastic Bougie With a Rotational Twist Technique
Stancil S, Miller J, Riddle M 14(3). 74 - 77 (Journal Article)
Previous studies have sought to determine the feasibility of exchanging the laryngeal mask airway (LMA) for an endotracheal tube (ETT) over a gum elastic bougie (GEB) and found the practice to have a success rate of about 50%. It has been speculated that the poor success rate may be due to the upward angle of the bougie tip meeting resistance against the anterior laryngeal wall. The use of a 90- to 180-degree twist technique to angle the bougie tip away from the anterior tracheal wall and caudally along the trachea theoretically could improve results. We conducted a prospective cadaveric study to determine if the use of a bougie 90- to 180-degree twist technique or the use of a more flexible pediatric bougie would improve previously published success rates. Emergency medicine personnel attempted exchange of an LMA for an ETT over a GEB using a twisting technique. Despite using the twisting technique, successful exchange over a bougie remained at 50%, similar to previous studies. Using a smaller, more flexible pediatric bougie led to a successful exchange in only 28% of attempts. In this study, the adding of a twist technique or using a pediatric bougie did not result in consistent successful exchange to an ETT from an LMA.
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