This study evaluates the effectiveness of Trendelenburg position and carotid ultrasound in predicting fluid responsiveness in VV-ECMO patients with ARDS in the prone position. Findings reveal that carotid corrected flow time (FTcBaseline) and stroke volume index variation (ΔSVITrend) are accurate and non-invasive predictors. These methods outperform traditional markers like pulse pressure variation, enhancing fluid management strategies in critical care.