患者男性,56岁。发现高血压10年,1周来工作繁忙,劳力后出现呼吸困难、头晕、头胀、胸闷,昨晚气促、心慌。以前无心力衰竭史。血压186/112 mmHg,心率118次/分,律整,双肺呼吸音粗,下肢无浮肿。判断患者左心功能不全失代偿的早期依据是 A.
心动过速 B.
心脏扩大 C.
心肌肥厚 D.
夜尿增多 E.
劳力性呼吸困难

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