Continuous perioperative cardiac output (DC) and blood pressure (PA) monitoring contributes to hemodynamic stability and ensures adequate perfusion pressure, resulting in a reduction in morbidity and mortality and length of hospital stay.

The monitors usually used in perioperative are either semi-invasive and difficult for calibration (oesophageal Doppler) or invasive (arterial catheter).

The Nexfin HD allows these two measurements and it is completely non-invasive, remains to validate its use in peroperative.

Inclusion Criteria:

• Adult patients candidate for surgery under general anesthesia requiring oesophageal Doppler or arterial catheter hemodynamic monitoring.

Exclusion Criteria:

• Patients with cardiac and thoracic surgery,
• patients for whom access to the head is impossible,
• facial trauma patients,
• patients with aortic malformation, dilation or coarctation,
• patients with aortic dissection,
• patients with vascular surgery with aortic clamping,
• patients with a tumor, stenosis or varices of the esophagus,
• patients with severe oesophagitis,
• patients with thoracic radiotherapy
• patients under guardianship or curatorship or deprived of liberty.