患者,男,40岁,哮喘急性发作1周,昨夜气急突然加重。体检:发绀,大汗,两肺叩诊过清音,两肺闻及哮鸣音,左肺呼吸音减弱,心率120次/分,律齐。用氨茶碱、激素后哮鸣音改善,但气急无好转。病情加重的原因最可能是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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