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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 | 22.78% |
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Stroke VolumeVariation, SVV | 16.48 |
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IVCdmax | 1.69 |
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Mean airway pressure | 5.8 |
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peak inspiratory pressure | 16 |
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cardiac output | 5.07 |
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CVP | 5 |
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Pulse Pressure Variation, PPV | 22.65 |
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peak inspiratory pressure | PEEP=0时，16；PEEP=5时，20；PEEP=10时，25；PEEP=15时，29. |
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Mean airway pressure | PEEP=0时，5.8；PEEP=5时，11；PEEP=10时，14；PEEP=15时，18. |
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IVCdmax | PEEP=0时，1.69；PEEP=5时，1.72；PEEP=10时，1.75；PEEP=15时，1.92. |
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CVP | PEEP=0时，5；PEEP=5时，7；PEEP=10时，8；PEEP=15时，12. |
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the dispensability index of the inferior vena cava, dIVC | PEEP=0时，22.78%；PEEP=5时，20.43%；PEEP=10时，20.28%；PEEP=15时，12.78%. |
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Pulse Pressure Variation | PEEP=0时，22.65；PEEP=5时，24.38；PEEP=10时，22.76；PEEP=15时，26.43. |
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Stroke VolumeVariation, SVV | PEEP=0时，16.48；PEEP=5时，16.42；PEEP=10时，26.4；PEEP=15时，.29.6. |
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cardiac output | PEEP=0时，6.06；PEEP=5时，5.86；PEEP=10时，5.75；PEEP=15时，5.23. |