【单选题】
某慢性低氧血症患者出现代谢性酸中毒和高钾血症，但血压正常，分析该患者血钾增高的原因是___
A. 肾小管K+ -Na+交换减弱
B. 肾小管H+ -K+交换增强
C. 肾小管Na+重吸收减少
D. 肾小球滤过率降低
E. 近端小管K+的吸收增加
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某患者，心悸气短，有风湿病史，近半年症状加重，查体左心界扩大，心率120次/分，胸骨左缘2-3肋间可闻及舒张期杂音，脉为水冲脉，本患者的疾病最大可能是___
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男性，33岁，右胸车祸伤1小时，呼吸困难，发绀。查体：脉搏130次/分，血压76/50mmHg,右前胸可及皮下气肿，右胸叩鼓音，右肺呼吸音消失，最可能的诊断是___
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B. 闭合性气胸
C. 创伤性血胸
D. 创伤性休克
E. 多发性肋骨骨折
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