患者,男,45岁。发作呼吸困难5年,再发3天,伴咳嗽,咳白色泡沫痰,无咯血发热,患甲亢1年,查体:血压135/90mmHg,呼气延长,双肺可闻及哮鸣音,发生呼吸困难最可能的机制是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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