Preoperative Gabapentin for Chronic Pain After Thoracotomy (GABATHOMIE).

Inclusion Criteria: * age \> 18 years * elective lung resection via thoracotomy Exclusion Criteria: * extended pleurectomy and chest wall resection * previous ipsilateral thoracotomy * previous ipsilateral radiotherapy * thoracotomy for pyothorax * chest injury * palliative surgery * contraindicated placement of a thoracic epidural catheter * allergy to medications on protocol * pre-existing pain syndrome * current treatment with morphine, gabapentin, pregabalin, anticonvulsivants or tricyclic antidepressants * a history of past or current drug addiction * severe hepatic, renal or cardiovascular disorders * inability to understand the study protocol or to answer the questionnaires on pain and quality of life * severe psychiatric disorders * incompetent adults under some form of guardianship * refusal of the protocol * persons without social security coverage * pregnant or lactating woman