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第三节 影响机体对缺氧 耐受性的因素

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第三节 影响机体对缺氧 耐受性的因素 - PowerPoint PPT Presentation


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第三节 影响机体对缺氧 耐受性的因素. 一、代谢耗氧率 发热,甲亢时,对缺氧耐受性低 体温降低,神经系统抑制时相反 二、机体的代偿能力. 第四节 氧疗与氧中毒. 一、氧疗 低张性缺氧效果最好 其它类型的缺氧,氧疗可增加 血浆内溶解的氧. 二、氧中毒 0.5个大气压以上的氧对细胞有毒 性作用,可引起氧中毒 机制:可能与活性氧有关 肺型氧中毒:咳嗽,呼吸困难

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slide1
第三节 影响机体对缺氧 耐受性的因素
  • 一、代谢耗氧率
  • 发热,甲亢时,对缺氧耐受性低
  • 体温降低,神经系统抑制时相反
  • 二、机体的代偿能力
slide2
第四节 氧疗与氧中毒
  • 一、氧疗
  • 低张性缺氧效果最好
  • 其它类型的缺氧,氧疗可增加
  • 血浆内溶解的氧
slide3
二、氧中毒
  • 0.5个大气压以上的氧对细胞有毒
  • 性作用,可引起氧中毒
  • 机制:可能与活性氧有关
  • 肺型氧中毒:咳嗽,呼吸困难
  • 脑型氧中毒:视听障碍,恶心,
  • 抽搐,昏迷等
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