This work consists, first of all, in making an inventory of the physiotherapy of the patient undergoing cardiac surgery under high flow oxygenation at the CHRU NANCY.

Then, in a second step, the impact of the physiotherapy on the lung ultrasound score associated or not with the NIV of the patient under OHD after cardiac surgery will be studied.

The objective is therefore to answer the following research question: what is the impact of a physiotherapy session with or without non-invasive ventilation in patients receiving high flow oxygenation after cardiac surgery on the lung ultrasound score measured by ultrasound?

Main hypothesis: Physiotherapy is associated with NIV when it is prescribed in patients undergoing high flow oxygenation after cardiac surgery.

Secondary hypothesis: Physiotherapy + NIV further improves pulmonary aeration versus physiotherapy + high flow oxygenation.

Inclusion Criteria:

• Person who has received full information on the organization of the research and has not objected to the use of the data.
• Person benefiting from cardiac surgery programmed on Cardiothoracic Bypass
• Patient under high flow oxygenation
• Age ≥ 18 years old
• 18.5 ≤ BMI ≤ 35 kg/m2
• Conscious and oriented patients: Glasgow 15

Exclusion Criteria:

• Surgical emergencies: grafting, dissections...
• Lumbar drainage in progress
• Beating heart surgery
• Refusal to participate in the study
• Persons referred to in Articles L.1121-8 and L.1122-1-2 of the Public Health Code (minors, person under guardianship, under curatorship)

The subjects of the study will be patients who stayed in the Cardiovascular Surgery and Cardiac Transplant Intensive Care Unit at NANCY CHRU from September 15, 2020 to March 15, 2021