Inclusion Criteria :  Age> 18 years Patient with suspected infectious syndrome qSOFA >= 2 Tachycardia>120 and/or PAS < 100mm Hg / MAP <60 mmHg  Exclusion Criteria :  Atrial fibrillation arrhythmia Vascular filling > 500 ml before hemodynamic evaluation by echo cardiography Perfusion of catecholamine (norepinephrine, epinephrine, or dobutamine) at the time of inclusion in the study (before hemodynamic assessment by echo cardiography) Patient sedated and on positive pressure ventilation, including NIV Tamponade due to a compressive pericardial or pleural effusion Patient with known pre-capillary PAH > 50 mmHg PAPS Presence of suspected acute valvulopathy requiring immediate cardiological expertise Absence of an acoustic window allowing the evaluation of the aortic or pulmonary ITV Minor patients, adults under guardianship, protected persons