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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 | 5.26% |
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Stroke VolumeVariation, SVV | 4.18 |
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IVCdmax | 2.15 |
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Mean airway pressure | 5.3 |
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peak inspiratory pressure | 11 |
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cardiac output | 5.42 |
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CVP | 8 |
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Pulse Pressure Variation, PPV | 5.65 |
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peak inspiratory pressure | PEEP=0时，11；PEEP=5时，20；PEEP=10时，22；PEEP=15时，28. |
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Mean airway pressure | PEEP=0时，5.3；PEEP=5时，10.5；PEEP=10时，14；PEEP=15时，17. |
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IVCdmax | PEEP=0时，2.15；PEEP=5时，2.49；PEEP=10时，2.56；PEEP=15时，2.36. |
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CVP | PEEP=0时，9；PEEP=5时，10；PEEP=10时，12；PEEP=15时，14. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，5.26%；PEEP=5时，3.73%；PEEP=10时，5.58%；PEEP=15时，6.13%. |
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Pulse Pressure Variation | PEEP=0时，5.63；PEEP=5时，45.26；PEEP=10时，7.17；PEEP=15时，8.78. |
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Stroke VolumeVariation, SVV | PEEP=0时，4.18；PEEP=5时，5.45；PEEP=10时，6.8；PEEP=15时，6.96. |
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cardiac output | PEEP=0时，6.35；PEEP=5时，6.28；PEEP=10时，5.17；PEEP=15时，5.96. |