Journal of clinical anesthesia
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Randomized Controlled Trial
Gastric insufflation with and without an inserted gastric tube in second-generation laryngeal mask airways: A randomized controlled cross-over trial.
Second-generation laryngeal mask airways are equipped with an additional lumen for a gastric tube, with the intention to reduce the risk of aspiration by draining gastric content. However, the effect of an inserted gastric tube through the gastric channel on gastric insufflation, a substantial part of the pathomechanism of aspiration, during positive-pressure ventilation is not clear. We hypothesized, that an inserted gastric tube increases the risk of gastric insufflation. ⋯ Placement of a gastric tube through the gastric channel of a second-generation laryngeal mask airway, independent of the cuff-type, increases the risk of gastric insufflation. Flow over the gastric channel indicate a higher risk of gastric insufflation and gastric insufflation may increase the risk of postoperative nausea and vomiting.