catheter tip
1.Methods 13 cases of patients,ASA Ⅱ~Ⅲ degree,undergoing thoracic surgery were employed general anesthesia. Double lumen tubes were used for one lung or two lung ventilation during the surgery. A tube was inserted through the double lumen tubes as the TGI catheter,the tip of the catheter was positioned 1~2cm above the carina.

