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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 | 2.7% |
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Stroke VolumeVariation, SVV | 5.3 |
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IVCdmax | 2.27 |
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Mean airway pressure | 4 |
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peak inspiratory pressure | 9 |
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cardiac output | 4.95 |
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CVP | 9 |
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Pulse Pressure Variation, PPV | 2.1 |
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peak inspiratory pressure | PEEP=0时，9；PEEP=5时，18；PEEP=10时，23；PEEP=15时，28. |
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Mean airway pressure | PEEP=0时，4；PEEP=5时，10；PEEP=10时，15；PEEP=15时，17. |
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IVCdmax | PEEP=0时，2.27；PEEP=5时，1.91；PEEP=10时，2.02；PEEP=15时，2.01. |
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CVP | PEEP=0时，11；PEEP=5时，13；PEEP=10时，15；PEEP=15时，17. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，2.7%；PEEP=5时，3.2%；PEEP=10时，2.8%；PEEP=15时，5.2%. |
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Pulse Pressure Variation | PEEP=0时，2.1；PEEP=5时，4.2；PEEP=10时，4.1；PEEP=15时，5,2. |
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Stroke VolumeVariation, SVV | PEEP=0时，5.3；PEEP=5时，6.17；PEEP=10时，7.68；PEEP=15时，8.35. |
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cardiac output | PEEP=0时，5.68；PEEP=5时，5.54；PEEP=10时，5.58；PEEP=15时，5.35. |