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目的探讨N-乙酰半胱氨酸(N-acetyl cysteine,NAC)联合无创正压通气(non-invasive positive ventilation,NIPV)对慢性阻塞性肺疾病急性加重期(acute exacerbation of chronic obstructive pulmonary disease,AECOPD)合并Ⅱ型呼吸衰竭患者肺功能、血气参数和超氧化物歧化酶(superoxide dismutase,SOD)、可溶性细胞间黏附分子-1(soluble intercellularadh