Acute kidney injury (AKI) is common in intensive care unit (ICU) and inducing a high morbidity and mortality. In severe forms of AKI (more than 25% of AKI patients admitted to the ICU), renal replacement therapy (RRT) is often necessary. Although RRT is a cornerstone of therapy, it can lead to serious adverse effects, such as intradialytic arterial hypotension. Indeed, arterial hypotension during the session - intra-dialytic arterial hypotension (IDH) - occurs frequently complication and so regardless of the RRT modality used. Its occurrence may worsen significantly the outcome as previously reported. It is therefore of parmount importance to prevent such an adverse effect. The investigators hypothesize that a decrease in the central venous oxygen saturation (SvcO2) measured related to a decreased cardiac output could precede the onset of IDH. The aim of this study is collect IDH in AKI patients and to measure continuously SvcO2 during RRT session in order to investigate its role in predicting IDH.
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Venous oxygen saturation measurement
Timeframe: 1-28 days