问题：
[单选题]
患者，男，68岁。既往有心绞痛发作史。4小时前因体育锻炼后出现心前区剧烈疼痛，含服硝酸甘油无效，急诊入院。患者入院后应先做下列哪项检查（ ）。
A、心脏X线检查
B、心电图
C、心肌酶学检查
D、血压
E、超声心动图
参考答案：
B
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