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通气功能测验对测定气道阻塞的程度,从而对慢性阻塞性肺部疾病的诊断和判断其严重性有很大的价值。但慢性阻塞性肺疾患早期气道狭窄多发生在细支气管而常规的通气功能测验如时间肺活量,最大通气量和最大呼气流速等只是在病变蔓延到较大的支气管时,总气道阻力增高,才显示异常,而细支气管狭窄不能及时反映出来。目前测定小气道阻塞多采用闭合气量,最大呼气流速容量曲线,等容量压力流速和频率依赖的肺顺应性等等。这些检查都需要一定的仪器设备。有人利用“用力呼气流速图”,分析不同
Ventilation function test for the determination of the extent of airway obstruction, and thus the diagnosis of chronic obstructive pulmonary disease and determine the seriousness of great value. However, early airway stenosis in patients with chronic obstructive pulmonary disease occurs in the bronchioles and routine ventilation test such as time vital capacity, maximum ventilation and maximum expiratory flow rate is only increased when the lesions spread to the larger bronchus, the total airway resistance increased , It showed abnormalities, and the fine bronchus can not be reflected in time. The current determination of small airway obstruction using closed air volume, maximum expiratory flow volume curve, isometric pressure flow rate and frequency-dependent lung compliance and so on. These tests require some equipment. Some people use “forced expiratory flow chart” to analyze different