Venous overload has an impact on peripheral organ perfusion and on the short- and long-term prognosis of intensive care patients. The VExUS ultrasound score is a new tool whose parameters can be used to estimate this impact. This score was initially evaluated and validated on an adult population. ) In children, there is only one study looking at the use and applicability of this VExUS score, highlighting its feasibility in a paediatric population, as well as a possible correlation between elevated central venous pressure and altered renal Doppler (one of the score's components).

Inclusion Criteria:

Children aged between 1 and 18 years, receiving extrarenal purification with UF > 10 ml/kg, bleeding > 10 ml/kg or vascular filling > 10 ml/kg

Exclusion Criteria:

• Refusal of the patient or opposition of one or both holders of parental authority.
• Minors with parental authority.
• Ultrafiltration time > 6h.
• Curarized patient, known abnormality of the hepatorenal venous network.
• Patient agitated or poor tolerance of the examination.
• Parents under court protection, guardianship or curatorship.

All children aged between 1 and 18 years, receiving extrarenal purification with UF > 10 ml/kg, bleeding > 10 ml/kg or vascular filling > 10 ml/kg treated at Toulouse University Hospital.