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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 | 2.75% |
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Stroke VolumeVariation, SVV | 3.68 |
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IVCdmax | 2.22 |
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Mean airway pressure | 5.2 |
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peak inspiratory pressure | 11 |
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cardiac output | 5.18 |
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CVP | 8 |
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Pulse Pressure Variation, PPV | 5.83 |
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peak inspiratory pressure | PEEP=0时，11；PEEP=5时，20；PEEP=10时，24；PEEP=15时，30. |
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Mean airway pressure | PEEP=0时，5.2；PEEP=5时，8.8；PEEP=10时，16；PEEP=15时，21. |
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IVCdmax | PEEP=0时，2.22；PEEP=5时，2.34；PEEP=10时，2.38；PEEP=15时，2.32. |
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CVP | PEEP=0时，9；PEEP=5时，9；PEEP=10时，11；PEEP=15时，14. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，2.75%；PEEP=5时，3.23%；PEEP=10时，4.25%；PEEP=15时，4.62%. |
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Pulse Pressure Variation | PEEP=0时，5.75；PEEP=5时，7.25；PEEP=10时，8.08；PEEP=15时，9.52. |
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Stroke VolumeVariation, SVV | PEEP=0时，3.66；PEEP=5时，4.14；PEEP=10时，6.02；PEEP=15时，6.85. |
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cardiac output | PEEP=0时，5.82；PEEP=5时，5.66；PEEP=10时，5.48；PEEP=15时，4.96. |