(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■■