Objective. To investigate the efficacy and safety of tetracaine hydrochloride in patient-controlled epidural analgesia （PCEA） after pulmonary lobectomy.Methods. Forty-three patients scheduled for elective pulmonary lobectomy under general anesthesia were randomly allocated into either tetracaine group （22 patients） or ropivacaine group （21 patients） . In the tetracaine group

0. 15% tetracaine was used for postoperative PCEA

while 0. 3% ropivacaine was used in the ropivacaine group. The duration of postoperative analgesia was 48 h. The PCEA included a bolus of 6 ml with a lockout time of 1 h. Postoperative pain score was measured by visual analogue scale （VAS）. Forced expired volume at the 1st second （FEV1.0）

forced vital capacity （FVC）

FEV1.0/ FVC and peak expired flow （PEF） were measured preoperatively and daily after surgery. Hemodynamics were monitored and recorded before and after each administration of local anesthetics during the period of the study.Results. VAS scores in both groups decreased significantly after a bolus injection of local anesthetics. There was no significant difference between the two groups in VAS either before or after the administration of PCEA. On the 1st and 2nd days after the operation

pulmonary function was reduced in both groups. However

there were no significant differences between the percentage of the changes of FEV1.0

FEV1.0/FVC and PEF in the two groups. There were also no significant differences between the percentage of the changes of heart rate

mean arterial blood pressure and SpO2 after administration of local anesthetics. There was no significant difference in overall satisfaction with pain relief.Conclusions. The analgesic effect of 0. 15% tetracaine is similar to that of 0. 3% ropivacaine used in patient-controlled epidural analgesia after thoracotomy. No serious side effects were observed.