Sitting Position and Blood Oxygenation in ICU Patient

This is a monocentric, comparative, randomized, open-label trial comparing two methods of "seated" positioning of the ICU patient, chair versus natural position in bed, on arterial blood oxygenation

• Sitting in a Chair position For patients randomized in the chair group, we will perform the transfer to the chair immediately after the morning arterial blood gas. The chair position will be maintained for 3 hours, if the patient shows no clinical signs of discomfort or intolerance.
• Semi-recumbent position in bed The patient will benefit from conventional positioning techniques in the ICU bed. With the help of the medical monitoring software present in the wards, we will note the different nursing care given to the patient during the 3 hours following the morning arterial gasometry.

Inclusion criteria

• Patient ≥ 18 years old in intensive care unit (ICU) or surgical intensive care unit (SICU)
• Intubated and under mechanical invasive ventilation for at least 24 hours or under non-invasive ventilation for more than 12 hours a day or under continuous high-flow nasal oxygen therapy for more than 24 hours or alternating NIV/HFNO.
• Patient or next of kin who has expressed consent to participate in the study

Exclusion criteria

• Tracheotomized patient
• Patient with a contraindication to sitting in a chair

• Deep vein thrombosis not effectively anticoagulated
• Fracture or orthopaedic disorder contra indicating mobilization
• Lung Embolism
• Hemodynamic instability with Average Arterial Pressure < 65 mmHg or a vasopressor amine dose greater than 0.5 ug/kg/min
• Pregnant or breastfeeding woman
• Therapeutic limitation with decision of non-reintubation in case of extubation failure
• Non-affiliated or non-beneficiary patient of a social security scheme
• Person deprived of liberty by judicial or administrative decision
• Person under guardianship or curators
• Patient already included in the study