Inclusion criteria:  To be over 18 To be scheduled for CABG surgery in the center of the study during the study period.  Exclusion criteria:  Chronic pain or opioid use before surgery Recent thoracic regional analgesia (< 1 month) Preoperative dementia or other neurologic or psychiatric disease incompatible with VAS pain scoring. Other technique of regional anesthesia (e.g. thoracic epidural) Opposition to data collection  Secondary exlusion criteria:  Postoperative prolonged sedation in ICU (> 12 hours) Postoperative surgical complication requiring surgical revision during the first two days. Opposition to data collection expressed secondarily