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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 | 6.18% |
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Stroke VolumeVariation, SVV | 4.32 |
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IVCdmax | 2.04 |
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Mean airway pressure | 5.7 |
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peak inspiratory pressure | 12 |
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cardiac output | 4.77 |
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CVP | 7 |
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Pulse Pressure Variation, PPV | 7.8 |
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peak inspiratory pressure | PEEP=0时，12；PEEP=5时，21；PEEP=10时，23；PEEP=15时，29. |
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Mean airway pressure | PEEP=0时，5.7；PEEP=5时，8.9；PEEP=10时，16；PEEP=15时，20. |
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IVCdmax | PEEP=0时，2.04；PEEP=5时，2.16；PEEP=10时，2.06；PEEP=15时，2.17. |
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CVP | PEEP=0时，7；PEEP=5时，10；PEEP=10时，12；PEEP=15时，13. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，6.18%；PEEP=5时，4.68%；PEEP=10时，5.29%；PEEP=15时，5.31%. |
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Pulse Pressure Variation | PEEP=0时，7.18；PEEP=5时，6.18；PEEP=10时，10.23；PEEP=15时，13.95. |
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Stroke VolumeVariation, SVV | PEEP=0时，4.28；PEEP=5时，5.78；PEEP=10时，5.88；PEEP=15时，7.33. |
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cardiac output | PEEP=0时，5.54；PEEP=5时，5.27；PEEP=10时，5.29；PEEP=15时，5.15. |