The purpose of this study is to investigate the ability of changes in PPV and SVV after Tidal Volume Challenge to predict fluid responsiveness in patients undergoing general anesthesia with protective mechanical ventilation.
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Delta(Δ) PPV(T2-T1)
Timeframe: intraoperative, one hour and 3 minutes after anesthesia induction
Delta (Δ)SVV(T2-T1)
Timeframe: intraoperative, one hour and 3 minutes after anesthesia induction