Fig. 6

Scatter plot of cutoff value of △PPV and △PPV% in included studies. The purple black dots represent absolute change of pulse pressure variation (△PPV). The black diamond squares represent percentage change of pulse pressure variation (△PPV%). The cutoff values of △PPV are as follows: (1) Myatra 2017 [14], 3.5%; (2) Jun 2019 [16], 1%; (3) Elsayed 2021 [19], 3.5%; (4) Taccheri 2021 [20], 1%; Hamzaoui2021 [21]; (5) Shi 2022 [22], 3.5%; (6) Xu 2022 [23], 2%. The cutoff values of △PPV% are as follows: (1) Myatra 2017 [14], 48%; (2)Yonis 2017 [15], 29%; (3) Jun 2019 [16], 25%; (4) Messina 2019 [17], 13.3%; (5) Messina 2020 [18], 12%; (6) Taccheri 2021 [20], 20%;