Diagnostic Performance of the Mitral Annulus Velocity Variation Measured by Tissue Doppler to Evaluate the Fluid Responsiveness During the Initial Management of Shock in Patients Admitted to the Emergency Department

Inclusion Criteria: * Patient has been informed of the study and does not refuse to participate. * Patient is at least ≥ 18 years of age. * The patient must be beneficiary of a health insurance plan. * Patient has shock with a mean blood pressure less than 65 mmHg (\<) * The patient does not have acute intracranial pathology * The referring physician has decided on a vascular filling with 500mL of crystalloids (NaCl 0.9% or Ringer lactate) Exclusion Criteria: * The patient has already received 2 vascular fillings since the beginning of his management * The patient is in shock and has a contraindication to vascular filling : shock of a cardiogenic or obstructive nature * The patient has an intracranial pathology requiring maintain a MAP ≥ 80 mmHg * The patient is intubated or on Non-Invasive Ventilation before the vascular filling * The patient is under court protection * The patient is pregnant, parturient or nursing