41患者,女性,32岁。某饭店服务员。中午于餐厅进食后出现头晕、头痛,继而心率加速、烦躁不安、呼吸急促,伴口唇、皮肤发绀,遂急诊就医。该患者发绀的最可能的原因是:( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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