Administration of Ropivacaine by Bi-laterosternal Multiperforated Catheters Placed Before a Sternotomy for Cardiac Surgery

Inclusion Criteria: * Patients who undergo scheduled cardiac surgery with sternotomy: aortic or mitral valve replacement, biological or mechanical, coronary bypass surgery * Age under 85 years * Patients who have given their consent according to the methods described in Title II of the book of the first Public Health Code * Possession of Social Security insurance. Exclusion Criteria: * Emergency surgery * Approach by thoracotomy * Heart transplant * Aortic dissection * Redo surgery. * Pregnant women * Refusal of the protocol * Protected minors or adults * Pre-existing psychiatric pathology including known states of opioid addiction * Long-term opioid medication * Physical or intellectual inability to use a PCA * Severe heart failure (ejection fraction less than 40% or PAH \> 50 mmHg) * Preoperative cardiogenic shock * Severe preoperative chronic or acute renal failure with a creatinine clearance of less than 30 mL / min according to Cockroft's formula * Known hypersensitivity to local anesthetics or to any component of the catheter * Known allergy or hypersensitivity to any of the study drugs or analgesia protocol (ropivacaine, paracetamol, opiates).