男性，26岁。排柏油便2天，加重伴头晕、心慌半天急诊人院。既往无肝病史，近期无服药史。查体：BP70/40mmHg，心率120次/分，腹平软，无压痛，肝、脾肋下未触及，四肢末梢发凉。
首选的处理是（）.
A.胃镜止
B.三腔二囊管压迫止血
C.补充血容量
D.急诊手术治疗
参考答案：C
解析：患者血压明显降低，心率快，四肢末梢发凉，出现休克表现，应首先补充血容量，进行抗休克治疗。三腔二囊管压迫止血只在药物治疗无效时紧急使用。患者尚无急症手术治疗的指征。
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