Objective. To investigate the changes and influencing factors of early postoperative pulmonary function of thoracotomy.Methods. Pre-and early postoperative pulmonary function was studied in 64 consecutive cases with optimal thoracotomy. Pain assessment was done before pulmonary function test

and the chief complaints of patients were recorded after the procedure. The changing curves of pulmonary function were done and the differences associated with groups

surgical styles

pain assessment

epidural analgesia

chief complaint and preoperative conditions were analyzed.Results. Pulmonary function was severely lowered to about 40% of the base line on the first day

and it was rehabilitated to about 60% of the base line on the eighth day. There was a greater gradient on the recovery curve on the 3rd and 4th days. Epidural analgesia was able to improve pain relaxation and pulmonary function in some degree. Single-factor analysis showed that postoperative pain

postoperative day and surgical style were the significant influencing factors for early postoperative pulmonary function. By multiple-factor analysis

preoperative pulmonary function

age and postoperative pain were the main factors

while surgical style had only weak effect on it.Conclusions. Early postoperative pulmonary function is severely impaired by thoracotomy. It rehabilitate gradually with time. Improvement of preoperative pulmonary function

reducing surgical procedure injuries

especially injury to respiratory muscle system

and enough postoperative pain relief are the most important means that would reduce pulmonary function impairment and consequently reduce postoperative pulmonary complications.