患者，女，25岁。自幼即常有一过性呼吸困难，坐位时很少发生，平卧时发生率高，尤其在伤风感冒时发作频繁，且较平时重。具体表现为，在平卧后即刻或稍过片刻发作一次呼吸困难，深吸几口气后呼吸趋平稳，直到起床不再产生症状。唱歌发不出长音，常伴有咳嗽、声音嘶哑等症状， Patient, female, 25 years old. Often have a transient childhood dyspnea, sitting rarely occurs when the incidence of supine, especially in episodes of cold and frequent attacks, and usually heavier. Specific performance, immediately after supine or a short break episode of breathing difficulties, take a deep breath after a few breaths calm until no longer get up to produce symptoms. Can not pronounce long sound, often accompanied by cough, hoarseness and other symptoms,