单项选择题

45岁男性，经理，送来急诊，自述半小时前突然感到气紧，胸闷，心悸，头晕，出汗，认为生命垂危，要求紧急处理。近一月来，这种情况发生过3次，每次持续约0.5～1小时，发病间隙期一切正常，发病与饮食无明显关系。最有助于鉴别诊断的项目是（）

A. 追问起病诱因
B. 心电图
C. 脑电图
D. 血钾测定
E. 脑CT
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