Portal vein pulsatility index is a marker of venous congestion evaluated by point of care ultrasound. It is associated with acute kidney injury, especially in critically ill patients. It may be considered as a dynamic marker. The investigators hypothesized that portal vein pulsatility index is higher after a fluid challenge only in patient without preload dependence in critically ill patients with cardiovascular insufficiency.
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Portal vein pulsatility index variation induced by the fluid challenge (%), defined by: Portal vein pulsatility index before the fluid challenge - portal vein pulsatility index after the fluid challenge.
Timeframe: One hour