1. To evaluate the consistency of cardiac output measured by pulmonary artery catheter and LiDCO in cardiac surgical patients 2. To evaluate whether different hemodynamic monitoring methods can accurately detect the trend of cardiac output changes
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Baseline Cardiac Output measurement
Timeframe: within1 minute at baseline position
Cardiac Output measurement after PLR
Timeframe: 1 minute after PLR
Cardiac Output measurement after Dobutamine stress test
Timeframe: 5 minutes after dobutamine stress test