Clinical Study On Ultrasound For The Localization Of Laryngeal Mask Airway In Adults

Objective:To evaluate the role of the ultrasound examination in detecting the correct placement of the Laryngeal Mask Airways (LMA).Methods:58ASA I and II patients scheduled for gynecological operation under general anesthesia underwent standard general anesthetic technique with4#LMA-ClassicTM. In all patients, the position of the laryngeal mask was judged satisfiedly by the clinical assessment. First, the position was confirmed by the ultrasound and the results was recorded.Later on a second anesthesiologist performed fiberoptic bronchoscope (FOB) to estimate LMA’s position. The third anesthesiologist evaluated the oropharyngeal leak pressure (OLP)、peak airway pressure (PIP) and reported adverse events. Results:When the position of the laryngeal mask was judged satisfiedly by the clinical assessment, for the FOB assessment, accuracy was59%(38/58); for the ultrasound assessment, accuracy was69%(40/58). It showed that there was no statistically significant difference in detecting ideal position of the LMA by ultrasound or FOL examination assessment (P>0.05), Ultrasound could improve OLP more (P<0.05), which showed it could better reflect the adequacy of laryngeal seal than FOB.Conclusion:It is possible to reflect the position of the LMA by Ultrasound examination.Ultrasound examination could better improve the laryngeal mask seal than FOB, which would help improve ventilation conditions.