Fluid Responsiveness Evaluation by a Non-invasive Method in CHildren

"Fluid expansion will be delayed while our index test is performed. After fluid expansion, patient will undergo an echocardiographic assessment of response to fluid expansion (gold-standard).~Our index test is the ΔSVi-AC: indexed percentage of stroke volume variation between baseline and during a standardized abdominal compression. Stroke volume will be assessed by transthoracic echocardiography.~Patient will undergo 3 echocardiographic assessment: At baseline, During abdominal compression, After the 10 to 20ml/kg crystalloid fluid expansion Abdominal compression : a sphygmomanometer will be inflated to a pressure of less than 10 mmHg and will be applied to the center of the patient's abdomen. Then, a gentle compression on the sphygmomanometer will be performed, calibrated at 22 - 26 mmHg according to the sphygmomanometer. The echocardiographic assessments will take place between 10 and 60 seconds after the start of the compression, which will therefore last less than a minute."