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【1125】Ⅱ型呼吸衰竭教学查房.ppt

  • 2026-07-22 23:18:59
【1125】Ⅱ型呼吸衰竭教学查房.ppt

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PPT总页数:27页
先看看我写的学习笔记,PPT往下翻。

一、完整病例资料

1.1 患者基础信息

  • 姓名:张某某,男,68 岁,住院号 2025xxxx,入院时间 2025 年 9 月 20 日 20:00
  • 主诉:反复咳嗽咳痰 10 年,加重伴呼吸困难 3 天,嗜睡 2 小时

1.2 现病史

  • 基础病史:确诊 COPD 十年,每年咳喘发作超 3 个月,冬春加重;长期 1-2L/min 家庭氧疗,每日吸氧 15 小时,单用噻托溴铵吸入,未规范联用 ICS+LABA。
  • 本次诱因:受凉后咳黄脓痰、发热 38.5℃,自行口服阿莫西林无效;1 天出现活动气短、夜间无法平卧;2 小时嗜睡、应答迟钝入院。
  • 伴随表现:食欲下降,尿量正常,双下肢轻度水肿,无胸痛咯血。

1.3 既往与个人史

  • 既往:高血压 5 年,硝苯地平控释片口服,血压平稳;无糖尿病、冠心病。
  • 个人:40 年吸烟史,每日 1 包未戒烟;无特殊粉尘职业暴露,无呼吸系统家族遗传病。

1.4 体格检查

1.4.1 生命体征与意识

  • T38.2℃,P108 次 / 分,R28 次 / 分浅快,BP135/85mmHg,空气下 SpO₂85%
  • 意识嗜睡,GCS13 分,口唇甲床重度发绀

1.4.2 肺部查体

  • 视:桶状胸,胸锁乳突肌等辅助肌参与呼吸,缩唇呼吸
  • 触:气管居中,双侧语颤减弱
  • 叩:双肺广泛过清音,肺下界下移
  • 听:双肺呼吸音减低,呼气相延长,弥漫哮鸣音,双肺底湿啰音

1.4.3 循环体征

  • 颈静脉充盈,双下肢凹陷性水肿,提示右心功能不全

1.5 实验室检查

  • 动脉血气(空气吸氧):pH7.25,PaCO₂70mmHg,PaO₂50mmHg,HCO₃⁻30mmol/L,BE+5;提示 Ⅱ 型呼衰、失代偿呼吸性酸中毒,肾脏轻度代偿
  • 血常规:WBC15.6×10⁹/L,中性粒 88%,血红蛋白正常,提示细菌感染
  • 炎症标志物:CRP95mg/L,PCT2.5ng/mL,全身重度细菌感染
  • 肝肾电解质:肝肾功能正常,血钾血钠处于正常区间

1.6 影像学表现

  • 胸部 CT / 胸片:双肺透亮度增高、膈肌低平、心影狭长(肺气肿);右下肺斑片状渗出影,符合社区肺炎

1.7 最终诊断

  1. Ⅱ 型呼吸衰竭,失代偿性呼吸性酸中毒
  2. 慢性阻塞性肺疾病急性加重(AECOPD)
  3. 右下社区获得性肺炎
  4. 慢性肺源性心脏病,右心衰竭

二、核心理论知识

2.1 呼吸衰竭分型诊断标准

  • 海平面静息呼吸空气,排除心内分流、心排量原发下降:
    1. Ⅰ 型呼衰:PaO₂<60mmHg,PaCO₂正常或偏低,机制为弥散 / 通气血流比例失调
    2. Ⅱ 型呼衰:PaO₂<60mmHg 同时 PaCO₂>50mmHg,核心机制肺泡通气不足

2.2 Ⅱ 型呼衰病理生理机制

  • 气道阻塞:COPD 气道重塑、痉挛,气道阻力升高,CO₂排出受阻
  • 呼吸肌疲劳:长期过度做功,通气效率持续下降
  • 二氧化碳麻醉:PaCO₂显著升高,脑脊液 pH 降低,先抑制大脑皮质出现嗜睡,严重抑制延髓呼吸中枢,通气进一步下降形成恶性循环

2.3 高浓度吸氧危害(AECOPD 人群)

  1. 消除低氧对颈动脉体化学感受器的驱动作用,自主通气量下降,CO₂潴留加重
  2. 解除低氧性肺血管收缩,通气血流比例失衡,无效腔通气增多
  3. Haldane 效应:血红蛋白结合氧气后,CO₂解离能力下降,血液二氧化碳蓄积

2.4 不同人群血氧控制目标

  • COPD 合并 Ⅱ 型呼衰:SpO₂维持 88%~92%
  • 单纯 Ⅰ 型呼衰、无二氧化碳潴留:SpO₂92%~96%

三、分层呼吸支持方案

3.1 第一层:控制性低流量氧疗

  • 适用:初始稳定患者,首选文丘里面罩,FiO₂24%~30%
  • 目标血氧 88%~92%,禁止高浓度吸氧

3.2 第二层:无创 BiPAP 通气(NIPPV)

  • 启动指征:规范氧疗 1 小时后血气 pH<7.30
  • 参数设置:IPAP12~18cmH₂O,EPAP4~6cmH₂O
  • 适用人群:意识嗜睡 GCS≥10,自主呼吸存在,血流动力学平稳
  • 禁忌:心跳骤停、GCS<8 重度昏迷、重度休克、上气道梗阻

3.3 第三层:有创机械通气

  • 启动指征:无创通气疗效差、重度昏迷、呼吸节律不规则、循环不稳定
  • 插管流程:快速序贯诱导,7.5~8.0mm 气管导管
  • 初始通气模式:容量控制通气,潮气量 6~8ml/kg 理想体重,RR12~16 次 / 分,PEEP5cmH₂O
  • 血气管理:允许性高碳酸血症,维持 pH>7.25,避免快速降 PaCO₂诱发碱低钾

四、综合药物治疗方案

4.1 抗感染治疗

  • 首选:哌拉西林他唑巴坦 4.5g 每 8 小时静滴,疗程 7~10 天
  • 备选:莫西沙星等呼吸喹诺酮
  • 覆盖病原体:肺炎链球菌、流感嗜血杆菌、卡他莫拉菌,兼顾非典型菌

4.2 支气管扩张

  • 雾化:异丙托溴铵 + 沙丁胺醇,每 6~8 小时雾化吸入,急性期持续使用

4.3 抗炎激素

  • 甲泼尼龙 40mg 每日静滴,连用 5 天后改为口服序贯

4.4 祛痰治疗

  • 氨溴索 30mg 每日三次静推,疗程 7~10 天

4.5 右心衰对症

  • 呋塞米 20mg 口服 / 静滴短期使用,水肿消退后停药

五、情景模拟处置

5.1 场景条件

  • 文丘里面罩 FiO₂30% 吸氧 1 小时,SpO₂90%,血气 pH7.26、PaCO₂72mmHg,意识恶化 GCS9 分

5.2 处置流程

  1. 评估无创通气可行性,患者意识持续下降,无创效果不佳,启动气管插管
  2. 插管前纯氧预充,备好丙泊酚、咪达唑仑、罗库溴铵诱导肌松药物
  3. 快速序贯诱导插管,容量控制通气初始参数设置
  4. 逐步下调吸氧浓度,严密监测血气,缓慢降低 PaCO₂,维持 pH>7.25

六、整体诊疗总结

  1. Ⅱ 型呼衰核心病理为肺泡通气不足,同时存在缺氧与二氧化碳潴留
  2. AECOPD 患者严格控制性氧疗,血氧目标 88%~92%,规避高浓度吸氧加重二氧化碳麻醉
  3. BiPAP 无创通气为 AECOPD 合并 Ⅱ 型呼衰一线方案,可降低插管率与病死率
  4. 有创通气指征:无创失败、重度昏迷、呼吸节律紊乱、循环不稳定
  5. 完整综合方案:抗感染、支气管扩张、短期激素、祛痰、短期利尿改善右心衰

七、课后学习任务

  1. 研读《2025 GOLD 慢性阻塞性肺疾病诊疗指南》
  2. 病例血气代偿分析:pH7.25、PaCO₂70、HCO₃⁻30,判定为急性加重失代偿呼吸性酸中毒伴肾脏部分代偿
  3. 思考题:突发胸痛、血氧骤降、气管左移,高度怀疑自发性气胸,列出完整处置流程
  4. 实操模拟:控制性氧疗→无创 BiPAP→气管插管完整抢救流程

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  1. CONNECT:[ UseTime:0.000499s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000566s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000288s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000496s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000648s ]
  8. SELECT * FROM `article` WHERE `id` = 539132 LIMIT 1 [ RunTime:0.006699s ]
  9. UPDATE `article` SET `lasttime` = 1784937389 WHERE `id` = 539132 [ RunTime:0.000573s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000487s ]
  11. SELECT * FROM `article` WHERE `id` < 539132 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001413s ]
  12. SELECT * FROM `article` WHERE `id` > 539132 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000710s ]
  13. SELECT * FROM `article` WHERE `id` < 539132 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000717s ]
  14. SELECT * FROM `article` WHERE `id` < 539132 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000872s ]
  15. SELECT * FROM `article` WHERE `id` < 539132 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000709s ]
0.087532s