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The LMA is a blind airway insertion device that comes in a range of sizes to fit pediatric and adult patients. It is the airway of choice within the controlled settings of a hospital. When properly placed the LMA rests on the supra-esophageal sphincter. In a prehospital environment there is a lot of movement of the patient and pressure off of the supra-esophageal sphincter can lead to vomiting and aspiration. Depending on the type and style of LMA it may be used as a conduit for a tracheal tube or bougie.
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