Fig. 2

Early versus late changes in CI (a) and GEDVI (b) during prone position. Symbols are individual values for each prone position session. Broken lines are regression lines performed on the whole dataset with corresponding R². Concordance rate is the percentage of data points falling into one of the two quadrants of agreement (i.e., upper right and lower left quadrants in which hemodynamic variations between T₁ and T₂ and between T₁ and T₃ have the same directional changes). Red rectangles are exclusion zones for computation of concordance rate, excluding data points with changes in both variables below 15%. ΔCI_T1–T2: change in CI between T₁ and T₂; ΔCI_T1–T3: change in CI between T₁ and T₃; ΔGEDVI_T1–T2 = change in GEDVI between T₁ and T₂; ΔGEDVI_T1–T3 = change in GEDVI between T₁ and T₃