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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 | 是/Yes |
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being younger than 18 years old | 是/Yes |
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being gestation | 是/Yes |
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being intra-abdominal hypertension, bladder pressure measured by catheter ＞16cmH2O | 是/Yes |
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existing pneumothorax or pulmonary bulla Without drainage. | 是/Yes |
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the dispensability index of the inferior vena cava, dIVC | 8.33% |
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Stroke VolumeVariation, SVV | 6.24 |
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IVCdmax | 1.61 |
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Mean airway pressure | 5.6 |
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peak inspiratory pressure | 12 |
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cardiac output | 5.19 |
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CVP | 7 |
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Pulse Pressure Variation, PPV | 7.14 |
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peak inspiratory pressure | PEEP=0时，15；PEEP=5时，19；PEEP=10时，25；PEEP=15时，30. |
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Mean airway pressure | PEEP=0时，5.6；PEEP=5时，9.5；PEEP=10时，17；PEEP=15时，19. |
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IVCdmax | PEEP=0时，1.64；PEEP=5时，1.45；PEEP=10时，1.45；PEEP=15时，1.52. |
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CVP | PEEP=0时，8；PEEP=5时，10；PEEP=10时，13；PEEP=15时，14. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，8.25%；PEEP=5时，6.9%；PEEP=10时，6.41%；PEEP=15时，7%. |
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Pulse Pressure Variation | PEEP=0时，7.12；PEEP=5时，10.18；PEEP=10时，11.25；PEEP=15时，15.36. |
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Stroke VolumeVariation, SVV | PEEP=0时，6.22；PEEP=5时，6.4；PEEP=10时，8.2；PEEP=15时，9.6. |
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cardiac output | PEEP=0时，6.08；PEEP=5时, 6.14；PEEP=10时，5.98；PEEP=15时，5.32. |