['aortic aneurysm, abdominal', 'pain', 'anesthesia, local']
['pca with chlorhydrate of morphine', 'acetaminophen']

        Inclusion Criteria:

          -  ASA (American Society of Anesthesiologists) physical status 1, 2 or 3

          -  Elective surgery for open repair of an aortic abdominal aneurysm performed in the
             Vascular Surgery Unit of the University Hospital of Besancon

          -  Informed consent given

          -  Health medical insurance affiliation

        Exclusion Criteria:

          -  Poor adherence to protocol attended

          -  Incapacity to consent

          -  Pregnancy and/or breast feeding

          -  Endovascular repair of aortic abdominal aneurysm

          -  Emergent surgery of a rupture or a fissuration of aortic abdominal aneurysm

          -  Chronic medical treatment by clopidogrel if clopidogrel not stopped 5 days before
             surgery at least

          -  Chronic medical treatment by prasugrel if prasugrel not stopped 7 days before surgery
             at least

          -  Chronic medical treatment by ticlopidine, inhibitors of phosphodiesterase , inhibitors
             of glycoprotein IIb/IIIa, adenosine triphosphate analogs or thrombin receptor
             antagonists

          -  Congenital or acquired bleeding disorder

          -  Incapacity to use patient-controlled analgesia device

          -  Chronic opioid abuse or dependence

          -  Chronic renal failure defined as a clearance < 30 ml/min

          -  Severe hepatic failure

          -  Other contraindications to ropivacaïne (allergy, medical history of porphyria,
             hypovolemia)

          -  Contraindications to acetaminophen

          -  Contraindications to morphine
      