Ultrasound Evaluation of Cardiac Function During Spontaneous Breathing Trials

Inclusion Criteria: * Intubated patient undergoing invasive mechanical ventilation for at least 24 hours and scheduled for a spontaneous breathing trial * Richmond Agitation Sedation Scale (RASS) between -1 and +1 * Patient at high risk of re-intubation with at least one of the following criteria: * Underlying cardiac disease (left ventricular dysfunction with left ventricular ejection fraction ≤ 45%, documented ischemic heart disease, chronic atrial fibrillation, known history of cardiogenic pulmonary edema) * Underlying respiratory disease (COPD, Emphysema, bronchial dilatation, asthma, obesity/hypoventilation syndrome, restrictive lung disease) Exclusion Criteria: * Neuromuscular pathology (myasthenia type) preceding hospitalization * Pregnant or breast-feeding women * Patient already included in the study * Protected person (under guardianship or curatorship) * Person under court protection * Person not affiliated to a social security scheme