患者，女性，44岁。因“突发上腹疼痛、恶心、呕吐10小时”来院。诊断急性出血坏死性胰腺炎行手术治疗。术后第2天出现进行性呼吸困难和低氧血症，面罩吸氧下动脉血PaO240mmHg。其低氧血症的产生是由于

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