Results The clinical manifestations were dyspnea , chest distress, palpitation;

结果突出的临床表现为呼吸困难、胸闷心悸；

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These patients of COPD usually have chronic cough, sputum production, air hunger or dyspnea, asthma and chest distress.

临床上多表现为慢性咳嗽、咳痰、气短或呼吸困难、喘息和胸闷。

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Objective To explore the relationship between unexplained chest distress and(or)chest pain in children and head-up tilt test(HUTT).

目的探讨儿童不明原因胸闷和（或）胸痛与直立倾斜试验（HUTT）的关系。

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