患者，女性，68岁。因在外科术后发生低血压而转人ICU，经输液治疗血压有所上升，动脉导管以及漂浮导管置入后测血流动力学数据如下：BP96/62mmHg，PAWP8mmHg，CVP6mmHg，CO3.2L/min，SVR1675dyn/(sec·cm5)。该患者出现低血压的原因是

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