Efficacy of Ambu AuraOnce laryngeal mask airway in Chinese patients undergoing general anesthesia

Abstract

Objective To evaluate the efficacy of Ambu AuraOnce laryngeal mask airway (LMA) in Chinese patients undergoing general anesthesia. Methods Fifty-six female patients, aged 20-64 yr, weighing 45-75 kg, of American Society of Anesthesiology physical statusⅠor Ⅱ (MallampatiⅠ-Ⅲ), scheduled for elective breast surgery under general anesthesia, were equally and randomly divided into either Ambu AuraOnce LMA group (group A) or LMA Supreme group (group S) using a random number table. After induction of anesthesia, Ambu AuraOnce LMA was inserted in group A, and LMA Supreme was placed in group S. After successful placement of LMA, correct position was confirmed by fiberoptic laryngoscopy. Intermittent positive pressure ventilation was performed during surgery to maintain pulse oxygen saturation > 95% and partial pressure of end-tidal CO2 at 30-45 mmHg. The success rate, insertion time, extubation time, airway sealing pressure, peak airway pressure and occurrence of air leakage of LMA were recorded. After removal of the LMA, the blood stains on the LMA were checked, and the occurrence of hypoxemia, regurgitation, nausea, vomiting and bucking was recorded. The occurrence of sore throat, hoarseness and dysphagia was also recorded within 24 h after surgery. Results There were no significant differences in terms of insertion time, overall success rate, success rate at first attempt, removal of LMA time, airway sealing pressure, and incidence of air leakage of LMA, hypoxemia, blood stains on the LMA, sore throat, hoarseness and dysphagia between the two groups. The rate for correct position of LMA confirmed by fiberoptic laryngoscopy was significantly higher in group A than in group S. Conclusion Ambu AuraOnce LMA can safely and effectively be applied for airway management in Chinese patients undergoing general anesthesia. Key words: Laryngeal masks; Respiration, artificial; Anesthesia, general