(2)阻塞性通气不足( Obstructive ventilatory disorders) Concept 由于气道狭窄或阻塞所致肺泡通气量不足 阻塞性通气不足 Airway obstruction、 narrow& contraction→→ airway resistance↑ (成年人气道阻力约为01~0.3PasL) alveolar ventilatory↓ Cause 气道内有层流和湍流、气道内径缩小、肺泡壁破坏 非弹性阻力增加
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■分类( Classification) A Central airway obstruction 气道分叉处以上的气道阻塞。 o obstruction is located in the airway outside the thorax inspiratory dyspnea 呼气 吸气 o obstruction is located in the airway inside the thorax expiratory dysnea 呼气 吸气
■ （Classification ） ▲Central airway obstruction ● Obstruction is located in the airway outside the thorax： inspiratory dysnea ● Obstruction is located in the airway inside the thorax： expiratory dysnea