题目内容

A3型题男，53岁，间歇性中上腹隐痛2个月余，黑便6天，呕血1天，急诊入院。腹痛多发生于空腹，进食后可缓解，有时夜间痛，近1周来排黑便2次，量分别约300g及200g，入院前1天出现呕血，随即头晕、心悸、出汗，此后再次呕血2次。体检；血压80/40mmHg（10.6/5.3kPa），心率120次/分，律齐，两肺呼吸音无异常，腹平软，肠鸣音活跃。估计其出血量约为（）

A. 300ml
B. 400ml
C. 500ml
D. 1000ml
E. ＞1000ml

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