患者，男性，72岁，有慢性支气管炎、阻塞性肺气肿病史20年。胸闷、气短加重1周。血气检查pH7.29,PaC0278mmHg,Pa0258mmHg,HC03-32mmol/L,BE5mmol/L。据此结果该患者酸碱失衡的类型最可能是

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