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【多选题】
关于慢性肺源性心脏病失代偿期的治疗，正确的是（）A.
与治疗衰竭原则一致，即强心、利尿、扩血管
B.
扩血管治疗可以提高PaO 2
C.
COPD相关的肺动脉高压及肺心病，治疗以改善通气，纠正缺氧为主
D.
当肺心病患者合并衰竭时可应用洋地黄
E.
肺心病患者利尿过度容易造成代谢性碱中毒，从而加重组织缺氧
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