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呼吸功能障碍的治疗-氧疗丨ppt

  • 2026-04-22 01:41:44
呼吸功能障碍的治疗-氧疗丨ppt

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先看看我写的学习笔记,PPT往下翻。

一、概述

  1. 氧气的重要性氧气是细胞能量代谢的必需物质。正常成年人氧气储备量为 1.0-1.5L,每分钟氧耗量约 250ml,需通过呼吸和血液循环摄取、运输氧气维持生命活动。一旦呼吸或循环环节出现障碍,机体可能缺氧,需通过氧疗纠正。

  2. 氧疗定义氧气疗法(简称氧疗)是通过提高吸入氧浓度(FiO₂),增加动脉血氧含量及饱和度,改善组织缺氧状态,从而维持正常生命活动的治疗措施,是纠正组织缺氧的重要辅助手段。

  3. 氧疗分类

    • 按吸入氧浓度(FiO₂):低浓度氧疗(FiO₂<30%)、中浓度氧疗(FiO₂ 30%-50%)、高浓度氧疗(FiO₂>50%)。

    • 按氧流量:低流量氧疗(氧流量≤4L/min)、高流量氧疗(氧流量 > 4L/min)。

二、氧疗适应证

  1. 适用范围与慎用情形

    • 适用范围:主要用于存在组织缺氧、低氧血症的患者,以及处于缺氧高危状态的人群。

    • 慎用情形:

      • 百草枯中毒患者:高浓度氧气会加剧百草枯的毒性作用,需谨慎使用。

      • 博来霉素使用者:该药物可能引发肺纤维化、肺炎样症状,高浓度氧疗会加重这些不良反应。

  2. 具体适应证

    • 呼吸系统疾病:各类呼吸衰竭、低氧血症患者。

    • 心血管系统疾病:心搏骤停后复苏者、心力衰竭患者、急性心肌梗死患者。

    • 休克:多种原因导致的休克患者。

    • 内环境失衡:严重酸碱中毒、水电解质紊乱患者。

    • 血氧运输障碍:严重贫血患者、血红蛋白异常者(如一氧化碳中毒)。

    • 药物中毒:吗啡、麻醉药、巴比妥类、氰化物等中毒患者。

    • 其他:昏迷患者、外科大手术后患者、分娩时产程延长且胎儿胎心音减弱的产妇。

三、氧疗装置与方法

  1. 装置分类依据根据氧疗系统提供的气体能否满足患者吸气需求,分为低流量给氧系统和高流量给氧系统。需注意:高流量与低流量不等于高浓度与低浓度吸氧,不同装置的氧流量与 FiO₂关系不同。

  2. 低流量氧疗系统

    • 特点:提供的气流无法完全满足患者吸气需求,需患者额外吸入空气补充;FiO₂不稳定,受呼吸状态影响,但患者舒适度高、使用方便且经济;适用条件为潮气量 300-700ml、呼吸频率 < 25 次 /min、呼吸规则稳定。

    • 常用装置:

      • 鼻塞或鼻导管:临床最常用,简单安全、廉价舒适,不影响口腔护理和进食,无重复呼吸。FiO₂计算公式为 21+4× 氧流量(L/min),张口呼吸会降低 FiO₂,氧流量超 6L/min 后 FiO₂不再随流量增加而上升。

      • 普通面罩:由塑料或硅胶制成,无单向活瓣或储气袋,呼出气经小孔排出,湿化效果较好。氧流量需≥5L/min 以排出二氧化碳,FiO₂可达 50%-60%。

      • 无重复呼吸和部分重复呼吸面罩:在普通面罩基础上加 600-1000ml 储气袋,氧流量需≥5L/min 以确保储气袋充盈并冲洗二氧化碳。面罩与储气袋间是否有单向活瓣,决定其为无重复呼吸或部分重复呼吸面罩。

  3. 高流量给氧系统

    • 特点:提供的气流能满足患者吸气需求,配备高气体流速与大储气袋;可提供稳定的 FiO₂,不受呼吸形式影响,还能调节气体温度和湿度;适用于严重通气或氧合功能障碍患者,以及需精确控制 FiO₂的低浓度氧疗患者(如 COPD 患者)。

    • 常用装置:

      • Venturi 面罩:依据 Venturi 原理,氧气经狭窄孔道形成高速涡流,卷吸周围空气稀释至所需浓度。FiO₂范围 24%-50%,调节时需改变氧流量或射流孔 / 空气入口口径,不受呼吸状态影响,适用于低氧血症伴高碳酸血症需严格控制 FiO₂的患者。

      • 经鼻高流量氧疗(HFNC):通过高流量鼻塞提供可调控的 FiO₂(21%-100%)、温度(31-37℃)和湿度,流量 8-80L/min,设备包括空氧混合装置、湿化治疗仪、高流量鼻塞及连接管路。能产生一定 PEEP、冲刷生理无效腔,改善换气和部分通气功能。适用于轻中度低氧血症(PaO₂/FiO₂ 100-300mmHg)、无紧急气管插管指征、生命体征相对稳定者,轻度通气功能障碍(pH≥7.3)患者可慎重使用;禁忌证包括呼吸心搏骤停、重度 Ⅰ 型呼吸衰竭、中重度呼吸性酸中毒(pH<7.3)、合并多器官功能不全等。

      • 密闭面罩加压给氧法:通过简易呼吸器、呼吸机或麻醉机实施,可连续或间断进行。适用于严重低氧血症等重症患者及气管插管前预充氧,实施时需注意体位、保持呼吸道通畅、防止胃肠充气。

  4. 机械通气利用呼吸机上的供氧装置进行氧疗,可精确调节 FiO₂(21%-100%),还能通过通气模式使小气道和肺泡复张,改善通气 / 血流比值失调和减少肺内分流,有效纠正低氧血症。

四、氧疗的注意事项

  1. 方法与浓度选择及调整:根据患者缺氧的发生机制,选择有效的给氧方法和合理的吸氧浓度,并依据病情变化和实验室检查结果随时调整。

  2. 严密观察患者状况:氧疗期间密切关注患者意识、面色、咳嗽和排痰能力、呼吸幅度与节律,尤其警惕 COPD 患者出现呼吸抑制。

  3. 保障呼吸道通畅:这是氧疗的基础和前提,需确保气道无阻塞。

  4. 注意加温和湿化:吸入氧需通过湿化瓶和必要的加温装置,维持呼吸道内 37℃温度和 95%-100% 湿度,以保证黏液纤毛系统的正常清除功能,避免干冷氧气损伤气道黏膜。

  5. 定时更换和清洗消毒:定期对呼吸机管道系统、湿化加温装置、导管等进行更换和清洗消毒,预防感染和导管堵塞。

  6. 明确氧疗定位:氧疗仅为辅助性治疗手段,用于为病因治疗争取时间、创造条件,不能替代对病因的根本治疗。

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  1. CONNECT:[ UseTime:0.000630s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000923s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000291s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000520s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000604s ]
  8. SELECT * FROM `article` WHERE `id` = 485754 LIMIT 1 [ RunTime:0.001205s ]
  9. UPDATE `article` SET `lasttime` = 1777081676 WHERE `id` = 485754 [ RunTime:0.000820s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 485754 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000455s ]
  12. SELECT * FROM `article` WHERE `id` > 485754 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000402s ]
  13. SELECT * FROM `article` WHERE `id` < 485754 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000594s ]
  14. SELECT * FROM `article` WHERE `id` < 485754 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004651s ]
  15. SELECT * FROM `article` WHERE `id` < 485754 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005184s ]
0.088909s