Objective to detect the expiratory flow limitation (EFL) with a new simple technique, expiratory negative pressure technique (NEP) in patients with chronic obstructive pulmonary disease (COPD).
目的：应用呼气负压技术(NEP)检测慢性阻塞性肺疾病(COPD)患者的呼气流速受限(efl)。
Objective to detect the expiratory flow limitation (EFL) with a new simple technique, expiratory negative pressure technique (NEP) in patients with chronic obstructive pulmonary disease (COPD).
目的：应用呼气负压技术(NEP)检测慢性阻塞性肺疾病(COPD)患者的呼气流速受限(efl)。
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