【单选题】【消耗次数：1】
慢性阻塞性肺疾病合并慢性肺源性心脏病，最常见的死亡原因是
①
心律失常
②
消化道出血
③
电解质紊乱
④
呼吸衰竭
⑤
休克
参考答案：
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慢性呼吸衰竭并发肺性脑病，不宜吸高浓度氧的主要原因是
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缺氧不是主要原因
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