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Patients had invasive mechanical ventilation; vasoactive agent wasn’t used or had been evacuate | 是/Yes |
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sinus rhythm | 是/Yes |
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existing fluid infusion test contraindication (acute coronary syndrome, cardiogenic shock and evidence showing overload fluid) | 否/No |
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being obvious right ventricular dysfunction, right heart failure and tricuspid regurgitation | 否/No |
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being younger than 18 years old | 否/No |
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being gestation | 否/No |
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being intra-abdominal hypertension, bladder pressure measured by catheter ＞16cmH2O | 否/No |
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existing pneumothorax or pulmonary bulla Without drainage. | 否/No |
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the dispensability index of the inferior vena cava, dIVC | 11.13% |
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Stroke VolumeVariation, SVV | 1.38 |
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IVCdmax | 2.12 |
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Mean airway pressure | 5.5 |
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peak inspiratory pressure | 10 |
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cardiac output | 5.39 |
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CVP | 7 |
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Pulse Pressure Variation, PPV | 9.66 |
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peak inspiratory pressure | PEEP=0时，10；PEEP=5时，18；PEEP=10时，22；PEEP=15时，28. |
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Mean airway pressure | PEEP=0时，5.5；PEEP=5时，8.8；PEEP=10时，15；PEEP=15时，17. |
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IVCdmax | PEEP=0时，2.12；PEEP=5时，1.91；PEEP=10时，2.02；PEEP=15时，2.01. |
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CVP | PEEP=0时，7；PEEP=5时，10；PEEP=10时，11；PEEP=15时，14. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，11.13%；PEEP=5时，8.74%；PEEP=10时，10.91%；PEEP=15时，12.14%. |
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Pulse Pressure Variation | PEEP=0时，9.66；PEEP=5时，12.23；PEEP=10时，13.14；PEEP=15时，12.27. |
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Stroke VolumeVariation, SVV | PEEP=0时，1.38；PEEP=5时，12.2；PEEP=10时，14.25；PEEP=15时，15.73. |
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cardiac output | PEEP=0时，6.3；PEEP=5时，6.32；PEEP=10时，6.11；PEEP=15时，.5.68 |