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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 | 4.4% |
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Stroke VolumeVariation, SVV | 8.29 |
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IVCdmax | 2.02 |
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Mean airway pressure | 5.2 |
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peak inspiratory pressure | 12 |
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cardiac output | 5.11 |
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CVP | 9 |
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Pulse Pressure Variation, PPV | 7.95 |
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peak inspiratory pressure | PEEP=0时，12；PEEP=5时，21；PEEP=10时，24；PEEP=15时，31. |
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Mean airway pressure | PEEP=0时，5.2；PEEP=5时，10.5；PEEP=10时，16；PEEP=15时，22. |
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IVCdmax | PEEP=0时，2.05；PEEP=5时，2.17；PEEP=10时，2.22；PEEP=15时，2.32. |
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CVP | PEEP=0时，11；PEEP=5时，12；PEEP=10时，14；PEEP=15时，15. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，4.38%；PEEP=5时，4.25%；PEEP=10时，5.17%；PEEP=15时，4.88%. |
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Pulse Pressure Variation | PEEP=0时，7.95；PEEP=5时，8.85；PEEP=10时，8.28；PEEP=15时，10.17. |
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Stroke VolumeVariation, SVV | PEEP=0时，8.26；PEEP=5时，7.78；PEEP=10时，8.78；PEEP=15时，10.18. |
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cardiac output | PEEP=0时，5.9；PEEP=5时，5.88；PEEP=10时，5.08；PEEP=15时，5.12. |