Fluid Responsiveness Evaluation by a Non-invasive Method in Children, Extended to PREterm Infants - FRENCH-PREMA
In this study, the investigators aim to validate a non-invasive marker of fluid-responsiveness in preterm infants (term below 37 gestational week) with acute circulatory failure based on standardized abdominal compression. This would allow physicians to identify which patient could benefit from a fluid expansion, thus avoiding a potentially useless or even dangerous fluid expansion, leading to fluid overload. To this end, the investigators will evaluate the diagnostic accuracy (sensitivity and specificity) of stroke volume variation induced by standardized abdominal compression for the diagnosis of fluid responsiveness (based on the gold-standard test: significant increase in cardiac index after fluid expansion).
- EligibilityCriteria: Inclusion Criteria:  Premature newborn under 37 weeks of amenorrhea hospitalized in neonatal intensive care Prescription of a 10 to 20ml/kg fluid expansion (crystalloid, blood products or albumin) by the physician in charge, whose goal would be to increase cardiac output (based on clinical, biological and/or echographic criteria).  Exclusion Criteria:  Acute cardiogenic pulmonary edema Hemodynamic instability making the delay necessary for abdominal compression and ultrasonography dangerous for the patient Non corrected congenital cardiopathy, or inferior to 15 days postoperative. Intra-abdominal hypertension or painful abdominal palpation Abdominal surgery in the last 15 days Supine position contraindicated or deleterious No investigator available to assess ultrasonographic measures Impairment of echocardiographic acoustic window or restless patient making ultrasonography impossible - HealthyVolunteers: No - Gender: All - MinimumAge: 1 Minute - MaximumAge: 5 Months - StdAgeList: Child - StudyPopulation: As this is a pilot study in a population of premature infants (term bellow 37 weeks of amenorrhea), the projected number of patients included will be 20, based on the department's active patient file, in order to have a minimum of 40 fluid expansion required for the study. - SamplingMethod: Non-Probability Sample