Hepatic artery and portal flows are both regulated to assume the whole hepatic blood flow. Each counts for respectively 25% and 75%. That so-called "buffer response" assumes that when portal flow increases, hepatic artery flow decreases. During fluid challenge in intensive care unit, fluid challenge is often administered to improve hepatic perfusion. That observation is not demonstrated. The aim of the study is to test buffer response and portal flow during fluid challenge.
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Portal blood flow measure before and after fluid challenge
Timeframe: Two hours: the difference in hepatic portal flow before and after a volume expansion of 500 ml NaCl 0.9%.