Abstract: ［Abstract］ Objective〖HTSS〗〓To study the feasibility of application of laryngeal mask with bronchial blocker for thoracic anesthesia.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Twenty patients were divided into 2 groups(n=10 each)using a random number table: endotracheal tube bronchial blocker group(group T) and laryngeal mask plus bronchial blocker group(group L). Midazolam 0.05 mg/kg, sufentanil 0.4 μg/kg, propofol 1.5 mg/kg and cisatracurium 0.2 mg/kg were injected intravenously for induction of anesthesia. An enhanced endotracheal tube with inner diameter 7.5 was inserted in group T, and the laryngeal mask airway was placed in group L .Then the bronchial blocker was inserted into the lateral bronchus under the guidance of fiberoptic bronchoscopy in 2 groups. During the operation the bronchial occluder cuff was inflated, and the surgical lateral bronchus was sealed, with one healthy lung ventilation. Mean arterial pressure(MAP), heart rate(HR), pulse oxygen saturation, end tidal carbon dioxide, lactic acid and cortisol concentration were recorded before intubation and intubation immediately. The positioning duration of bronchial occluder, pulmonary collapse, propofol dosage, operation time, bleeding volume, extubation time and postoperative airway mucosal injury were compared between the two groups.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The MAP、HR and cortisol concentration were higher at intubation immediatelythan that before intubation in group T(P＜005).The data in group Lshowed no significant changesexcept that the HR increased. Compared with group T, the MAP、HR and cortisol concentration were lower in group L（P＜005）. There were no significant differences in the positioning duration of bronchial occluder and pulmonary collapse between the two groups. Compared with group T, the propofol dosage were lower andthe extubation time was shorter in group L（P＜005）.
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓Laryngeal mask with bronchial blocker may be considered an alternative onelung ventilation technique, which can be used in thoracic anesthesia.

Key words: anesthesia, thoracic surgical procedures, bronchial blocker, laryngeal mask