Time-motion-mode Ultrasound Diaphragm Measures in Patients With Acute Respiratory Distress in Emergency Department

"Diaphragmatic ultrasound will be performed by the physician supporting the patient on arrival and also at 4 hours later in the beginning of therapeutic management. The patient will be monitored for 24 hours following inclusion.~The exams will all be done with the same ultrasound system (Vivid S6 GE Ultrasound) and a phased array probe, also called a cardiac probe."