Sensitivity and Specificity of Gastric Ultrasonography in Determination of Gastric Contents.

Perioperative pulmonary aspiration (PPA) is a major cause of morbidity and mortality. During anesthesia, airway reflexes become depressed, placing patients at risk of PPA. Gastric ultrasonography (GUS) can be used to qualitatively differentiate between solids, liquids, and empty gastric contents.