Critical illness is associated with ICU acquired weakness and diaphragmatic dysfunction.

Ultrasound can evaluate the muscle mass non invasively and provides the ability for a muscle follow up during and after the ICU stay. Magnetic stimulation of the phrenic nerves and the measure of the end expiratory tracheal pressure with an occlusion valve allows to evaluate the diaphragm force production in mechanically ventilated patients.

The aim of the present study is to constitute an image bank and to describe the muscle mass and function recovery in critically ill patients.

Critical illness is associated with ICU acquired weakness and diaphragmatic dysfunction.

Ultrasound can evaluate the muscle mass non invasively and provides the ability for a muscle follow up during and after the ICU stay. Magnetic stimulation of the phrenic nerves and the measure of the end expiratory tracheal pressure with an occlusion valve allows to evaluate the diaphragm force production in mechanically ventilated patients.

The aim of the present study is to constitute an image bank and to describe the mass and function recovery in critically ill patients.

Ultrasound and clinical data will be collected and analysed during the ICU stay.

Inclusion Criteria:

• Critically ill patients with at least one organ failure defined, organ failure being defined by a SOFA equal or above 3 for the organ, and an expected duration of ICU stay equal of above 3 days

Exclusion criteria:

- Pregnancy, age below 18, absence of consent

Critically ill patients with at least one organ failure and an estimated duration of ICU stay of 3 days or more

NC