Evaluate the Muscle Protection Effect of Sevoflurane Sedation in Vascular Surgery

Inclusion Criteria: * persons who have provided written consent * patients over 18 years of age * patients undergoing scheduled vascular surgery with high clamping for: * Abdominal aortic aneurysm * suprapopliteal vascular bypass (aorto-bi-femoral, femoral trifurcation, ilio-femoral or femoro-femoral, femoro-popliteal). Exclusion Criteria: * persons without health insurance cover * patients younger than 18 years of age, pregnant or breast-feeding women and adults under guardianship * patients with epilepsy * emergency surgery * patient presenting a contra-indication for Sevoflurane: hypersensitivity to sevoflurane or to other halogenated anaesthetic agents, myopathy, hyper-eosinophilia, immunoallergic hepatitis, known or suspected genetic predisposition to malignant hyperthermia * patients presenting a contra-indication to the use of Propofol: known hypersensitivity to propofol or to one of the constituents of the product, allergy to peanuts or soja * Patients presenting a contra-indication for sufentanil: hypersensitivity to sufentanil or to opioids * Association with opioid agonists-antagonists or partial opioid antagonists * patients presenting a CI for the use of Cisatracurium: history of allergy or hypersensitivity to cisatracurium or atracurium * patients presenting cardiac, respiratory, renal or kidney failure, hypovolemia, poor general health * Patients with a risl of prolongation of the QT interval * Patients with end-stage renal failure - requiring dialysis