Erector Spinae Plane Block Versus Paravertebral Block for Analgesia After Cardiac Surgery (PEPS)

Inclusion Criteria: * Undergoing any (scheduled) surgery of the heart (valve or coronary surgery) via a median sternotomy * Physical status classification (ASA) ≤3 * Patients benefiting from a Social Security scheme or benefiting from it through a third party Exclusion Criteria: * Emergency cardiac surgery * Exclusion criteria related to cardiac surgery with thoracotomy, occurrence of aortic dissection, redo surgery. * Aortic counterpulsation * Preoperative cardiogenic shock * LVEF\< 30% * Severe preoperative chronic or acute renal failure with creatinine clearance less than 30 mL / min according to the MDRD formula * Pre-existing psychiatric pathology, including addiction to opioids * Physical or intellectual incapacity to use a PCA * Known allergy or hypersensitivity to any of the study drugs or analgesia protocol (ropivacaine, paracetamol, opioids) * Contraindication for performing the paravertebral block and Erector of the spine (ESP): Infection at the site of injection, severe hemostasis disorder, thoracic spinal pathology making the procedure difficult or dangerous to operate * Obese patient (BMI\> 30kg / m2) with poorly perceived thoracic spinous processes. * vulnerable patients(Pregnant or breastfeeding women, persons benefiting from enhanced protection, namely persons deprived of their liberty by a judicial or administrative decision, adults under legal protection).