李先生,52岁,因心慌,心前区不适前来就诊,王护士在巡视候诊病人时发现该病人面色苍白,呼吸困难,护士前去询问无应答,查脉搏50次/分,呼吸24次/分,对该病人应( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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