Automatic Oxygen Administration After Major Abdominal and Thoracic Surgery

Automatic Oxygen Administration in Early and Late Postoperative Hypoxaemia Prevention After Major Abdominal and Thoracic Surgery

The aim of the study is to assess the use feasibility of the FreeO2 system so as to deliver automatically oxygen in the post anesthesia care unit in a patient population admitted for major abdominal and thoracic surgery.

The investigators' hypothesis is that FreeO2 system will provide a better control of the oxygen saturation and reduce postoperative hypoxaemia.

Inclusion Criteria:

• Preoperative anesthetic visit for major thoracic or abdominal surgery ( ARISCAT risk score ≥ 26) with general anesthesia
• Patient consent

Randomization Criteria:

• Admission in post-anesthesia care unit after major thoracic or abdominal surgery

• Randomization and device establishment within a time less than one hour after the endotracheal intubation

• Availability of the prototype FreeO2

• Absence of criteria of gravity justifying immediately a different technique of ventilatory support:

  • Disturbance of consciousness with a Glasgow Coma Score ≤ 12
  • Serious ventricular rhythm disorders
  • Hemodynamic instability (SBP <80mmHg or recourse to vasopressors)
  • Cardiac or respiratory arrest
  • pH < 7.35 and PaCO2 > 55 mm Hg

• Necessity of an oxygen flow less than 15 L / min to maintain a SpO2 higher than 92%.

• Absence of necessity of a urgent surgery

• Oxygen saturation measured by Spo2 sensor

Exclusion Criteria:

• BMI ≥ 35 kg/m2
• Obstructive sleep Apnea (with or without Mechanical therapy)
• Emergency Surgery for life-threatening
• Age <18 years
• Pregnant women, lactating
• perturbed or non-cooperative patient