女性,55岁,有高血压、糖尿病病史10余年,近来劳累后发生心前区闷痛,每次1~3min,常规心电图未发现缺血性改变,须做进一步检查,以下哪项检查不必要()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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