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【单选题】
男性，56岁，发现高血压10年，1工作繁忙，出现头晕、头胀、胸闷，昨晚气促、心慌。以往无心力衰竭史。血压186／112mmHg，心率118次／min，律齐，双肺呼吸音粗，下肢无浮肿 该例患者心功能进入失代偿期最主要的原因是（）
A.
血压过高
B.
心率增快
C.
劳累
D.
血容量过多
E.
心肌肥厚
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