Use of the Aortic Time-velocity Integral Via Suprasternal Ultrasound to Search Preload Dependence in Paediatric Surgery : Kid's Fluid Management (FM)

Measurement of aortic Vmax and VTI with suprasternal doppler. Measurement of VTI variation and cardiac output after general anaesthesia. After preoperative fasting compensation, measurement of cardiac output (CO). Search of a difference in the suprasternale VTI variability between the patients who have increased their CO after fasting compensation and the patient who haven't.