Fluid administration is the first-line treatment in hypovolemic states in critically ill patients. Prediction of fluid responsiveness is possible with echocardiography by assessing the variation of the sub-aortic velocity-time integral (AoVTI) during a passive leg raising test (PLR) or Mini-fluid challenge. However, VTI-Ao measurement is not feasible in all patients due to poor echogenicity. Validation of new fluid-responsiveness indices may facilitate the evaluation in this patient population. Among the available indices, variation of the sub-pulmonary VTI is a potential criterion.
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Fluid responsiveness
Timeframe: T0 : baseline T1 : 60 to 90 after passive legs raising manoeuver or mini fluid challenge T2 : within 10 mins after fluid infusion of 500mL of crystalloïds solution
Ability of sub-pulmonary VTI variation to predict fluid responsiveness
Timeframe: T0 : Baseline T1 : 60 to 90 after passive legs raising manoeuver or mini fluid challenge T2 : within 10 mins after fluid infusion of 500mL of crystalloïds solution