Abstract
脉压变异率（PPV）作为心肺交互的产物，是预测容量反应性的动态指标，但PPV预测急性呼吸窘迫综合征患者容量反应性受到诸多因素影响，如小潮气量通气、自主呼吸、腹内高压，此时可通过改变PPV阈值、潮气量挑战、叹息试验等方法提高其预测准确性；当PPV预测容量反应性准确性受到呼吸系统顺应性降低或右心功能不全影响时，则需要通过被动抬腿试验和呼气末阻断试验才能准确预测容量反应性。.
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