Obstructive emphysema is one of the primary pathological manifestations of chronic obstructive pulmonary disease (COPD), scientists have been focusing on obstructive emphysema.
阻塞性肺气肿(肺气肿)是慢性阻塞性肺疾病(COPD)的主要病理表现，已成为研究中的焦点。
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Objective to study the window technique in evaluating the chronic obstructive emphysema and pulmonary residual volume in long-term smoker without symptoms.
目的探讨窗技术对慢性阻塞性肺气肿和无症状长期吸烟者肺残气量的评价。
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Chronic obstructive pulmonary disease (COPD), of which emphysema and chronic bronchitis are the most common form (and often co-exist), is characterized by swelling of the airways.