Measuring the Plasma Clearance of Iohexol to Estimate Glomerular Filtration Rate in Intensive Care Unit Patients: Preliminary Feasibility Study

Inclusion Criteria: * Age ≥ 18 years * Patient admitted to intensive care for less than 12 hours * Acute circulatory failure * Patient carrying an arterial catheter * Informed consent obtained * Affiliated to social security system Exclusion Criteria: * Administration of iohexol the week before intensive care admission * Administration of iohexol expected within 24 hours of study entry * Known history of cutaneous immediate or delayed allergic reaction to the injection of the product * Indication for albumin transfusion within 24 hours of potential inclusion in the study * Pregnancy or breastfeeding in progress * Patient under guardianship or judicial protection known at the time of inclusion * Withdrawal of consent * Administration of iohexol outside the study within 24 hours after administration of iohexol in the context of the study * Administration of intravenous albumin in the 24 hours following administration of iohexol in the context of the study