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支气管哮喘肺气肿关系

来源:华人健康网 | 发布时间:2010-08-10 08:47:57 | www.chinesejk.com
肺气肿是指慢性气管炎发展到肺心病的中间阶段,因肺泡腔扩大、肺泡内充气增多而导致肺组织弹性减退和肺容积膨胀而言。支气管哮喘由于长期反复发作,肺气肿便成为其最常见的并发症之一。通常所说的肺气肿一般是指阻塞性肺气肿而言,因其占肺气肿的80%。由于支气管哮喘反复发作或伴反复感染,可使细小支气管粘膜增厚,管腔变窄,粘液腺分泌增多,粘液储留,致使支气管胜不完全阻塞。通常,吸气时支气管管胜扩张,所以患者不觉得吸气时气短。但当呼气时,支气管腔恢复原状,使不完全阻塞加重,肺泡内气体难以通过狭窄的管胶而充分呼出,遂使肺泡内气压逐渐增高而引起肺泡腔扩张。气体排除障碍日久,则肺泡内残气增加,导致肺泡壁破坏融合,从而形成阻塞性肺气肿。

(编辑:小珊 )

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