This study is designed to compare thoracic epidural catheter insertion distances, in order to determine which is the best for pain relief following a thoracotomy. HYPOTHESIS : 1. The quality of epidural analgesia upon coughing one hour following the end of surgery will not be inferior if the catheter is inserted 7 cm in the epidural space, versus 3 and 5 cm. 2. The quality of epidural analgesia upon coughing at 24 hour will not be inferior if the catheter is inserted 3 cm in the epidural space, versus 5 and 7 cm.
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Quality of pain relief during cough
Timeframe: At one hour and 24 hours after surgery