Central and peripheral arterial pressure decoupling occurs in some clinical conditions like sepsis or cardiopulmonary bypass. This decoupling may leed to unsuitable decisions such as the use of catecholamines.

The aim of this study is to evaluate the pulse wave's speed as a marker of central and peripheral arterial pressure decoupling in a scheduled condition which is the cardiopulmonary bypass during cardiac surgery.

Inclusion Criteria:

• Scheduled patient for coronary or valvular surgery with cardiopulmonary bypass
• Cardiopulmonary bypass is at least 90 minutes
• Written consent is needed

Exclusion Criteria:

• Patient with heart rate disorder
• Patient with aortic dissection
• Dobutamine/milrinone/levosimendan treatment before surgery
• Patient with heart rate due to a pacemaker