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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 | 4.38% |
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Stroke VolumeVariation, SVV | 4.69 |
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IVCdmax | 1.92 |
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Mean airway pressure | 5.2 |
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peak inspiratory pressure | 11 |
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cardiac output | 5.35 |
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CVP | 8 |
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Pulse Pressure Variation, PPV | 6.22 |
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peak inspiratory pressure | PEEP=0时，11；PEEP=5时，13；PEEP=10时，22；PEEP=15时，25. |
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Mean airway pressure | PEEP=0时，5.5；PEEP=5时，9.4；PEEP=10时，16；PEEP=15时，18. |
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IVCdmax | PEEP=0时，1.92；PEEP=5时，2.03；PEEP=10时，2.15；PEEP=15时，2.2. |
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CVP | PEEP=0时，10；PEEP=5时，14；PEEP=10时，14；PEEP=15时，17. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，4.38%；PEEP=5时，5.18%；PEEP=10时，4.62%；PEEP=15时，4.16%. |
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Pulse Pressure Variation | PEEP=0时，6.18；PEEP=5时，7.06；PEEP=10时，8.27；PEEP=15时，8.36. |
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Stroke VolumeVariation, SVV | PEEP=0时，4.69；PEEP=5时，5.12；PEEP=10时，4.5；PEEP=15时，5.36. |
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cardiac output | PEEP=0时，6.06；PEEP=5时，6.12；PEEP=10时，5.93；PEEP=15时，5.47. |