Once the pericardium is closed, there is no information on the hemodynamics of the grafts after coronary artery bypass grafting. This would be the reason for different opinions on pericardial closure: some teams do not close the pericardium and others close it.

In the department Cardiovascular Surgery of the University Hospital of Saint-Etienne, the Medistim machine is used in routine and the hemodynamic properties of the grafts are recorded immediately after the bypass surgery, before the closure of the pericardium.

The aim of the study is to have hemodynamic information immediately after the closure of the pericardium using the Medistim machine. The prospective study will be conducted on 50 patients, who will be selected consecutively without randomization. The inclusion and exclusion criteria are determined.

Inclusion Criteria:

• All patients who will have isolated aortocoronary bypass grafting surgery

Exclusion Criteria:

• History of thoracic trauma
• Severe cyphosis
• Severe thoracic deformity (Pectus excavatum)
• Pericardial disease
• History of radiotherapy
• Severe pulmonary disease (emphysema)
• Right heart failure
• Redo surgery

All patients who will have isolated aortocoronary bypass grafting surgery will be included.