Postoperative pain after cardiac surgery is associated with reduced postoperative respiratory function. There is an association between greater pain and more pronounced decreases in lung volumes postoperatively. With an incidence of 10% to 25% of cases, pulmonary complications are the second source of postoperative morbidity after cardiac complications; in 2-5% of cases, the dysfunction is severe and leads to significant consequences that can lead to death. It has been shown that postoperative pain after cardiac surgery is associated with a reduction in functional respiratory capacity. There is an association between greater pain and more pronounced decreases in lung volumes postoperatively. The main objective of this study will be to evaluate the impact of locoregional anesthesia by parasternal block analgesic on postoperative respiratory function at D1 postoperatively

Inclusion Criteria:

• Patients over 18 years of age
• Elective cardiac surgery under CEC with sternotomy
• Written informed consent from the patient.
• Women of childbearing age must have a negative urine HCG pregnancy test.

Exclusion Criteria:

• Thoracotomy approach
• Mini-sternotomy approach
• Opioid drug dependence or chronic opioid drug use
• Chronic benzodiazepine use (respiratory depressant treatment or treatment that may affect postoperative respiratory function)
• Contraindication or allergy to local anesthetics
• Emergency surgery
• Acute infective endocarditis
• Immunosuppressive or steroid treatment (prednisone > 0.5mg/kg/day or equivalent)
• AIDS with CD4 count <200/mm3
• Autoimmune disorder
• Transplant recipient
• Inclusion in another study within the last 30 days.
• Pregnancy