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. 2021 Jul;11(7):3133–3145. doi: 10.21037/qims-20-700

Figure 5.

Figure 5

Four-quadrant concordance analysis between changes in VTI during TP and after FC. ΔVTI-TP, changes in velocity-time integral during the Trendelenburg position; ΔVTI-FC, changes in velocity-time integral after fluid challenge.