患儿,5岁,既往有哮喘病史,3天前感冒,逐渐咳喘加重,使用口服及雾化糖皮质激大素和支气管扩张剂未缓解,来院就诊。查体:面色青灰,大汗淋漓,不能平卧,三凹征阳性,双肺呼吸音低,无哆音,心音低钝,患儿最可能的诊断是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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