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【291】肺水肿.ppt

  • 2026-04-08 13:18:12
【291】肺水肿.ppt

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先看看我写的学习笔记,PPT往下翻。

一、分类与发病机制

(一)核心分类

  • 心源性肺水肿:由左心室充盈压急剧升高致肺毛细血管静水压增高引起,液体蛋白含量低。
  • 非心源性肺水肿:由肺血管通透性增加导致,液体蛋白含量高,以急性呼吸窘迫综合征(ARDS)为主要病因。

(二)心源性肺水肿机制

  1. 核心诱因:高血压急症、急性心肌缺血、快速性心律失常、瓣膜病等导致左心房压>25mmHg,液体突破肺上皮进入肺泡。
  2. 病理生理:交感神经激活引发心动过速、全身血管阻力升高,进一步加重左心室负荷,缺氧可恶化心肌功能,形成恶性循环。
  3. 特殊类型:“速发型” 肺水肿病情剧烈,需紧急联用动静脉血管扩张剂。

(三)非心源性肺水肿机制

  1. 常见病因:ARDS、高原性肺水肿(HAPE)、神经源性肺水肿、复张性肺水肿、输血相关急性肺损伤(TRALI)等。
  2. 病理生理:肺血管通透性增加,液体和蛋白质大量漏出,净漏出量取决于过滤与排出速度平衡。
  3. 典型类型特点:
    • 神经源性:由头部损伤、癫痫等诱发,交感神经过度兴奋致肺毛细血管渗漏,48-72h 内症状多缓解。
    • 高原性:海拔>3600m 时缺氧性肺血管收缩,肺动脉压力升高引发。
    • 复张性:单侧萎陷肺快速复张后出现,表现为急性呼吸困难、低氧血症,以支持治疗为主。

二、评估与检查

(一)病史与体格检查

  1. 共性症状:呼吸困难、呼吸急促、咳嗽、咳泡沫痰,动脉低氧血症。
  2. 心源性相关线索:有缺血、心衰、瓣膜病病史,查体可见 S3 奔马律、颈静脉怒张、肝大、外周水肿,四肢冰凉。
  3. 非心源性相关线索:有感染、创伤、输血、高原暴露史,查体四肢温暖,肺部啰音无特异性。

(二)实验室检查

  • BNP 检测:阴性预测值>90%(<100pg/ml 提示非心衰),阳性预测值>90%(>500pg/ml 提示心衰);肾衰患者排除标准可调整为<200pg/ml。

(三)影像学与特殊检查

  1. 床旁胸部 X 线:可初步区分两类肺水肿,血管蒂宽度测量可能提高准确性。
  2. 超声检查:
    • 肺部超声(LUS):通过 B 线等伪影评估肺泡间质病变,BLUE 流程用于筛查,12 分区评分评估治疗效果。
    • 心脏超声:评估心肌 / 瓣膜功能,区分收缩 / 舒张功能障碍,明确心源性病因。
  3. 肺动脉导管:金标准,肺动脉楔压>18mmHg 提示心源性或容量超负荷,需警惕穿刺并发症。

三、鉴别诊断

(一)核心鉴别要点

  • 心源性:多有心脏基础病,BNP 升高,超声提示心功能异常,肺动脉楔压>18mmHg。
  • 非心源性:多有感染、创伤等诱因,BNP 正常或轻度升高,肺动脉楔压≤18mmHg。
  • 特殊情况:10% 患者为混合病因(如感染性休克合并容量超负荷),需结合心肺超声或肺动脉导管确诊。

(二)主要鉴别方向

  1. 心源性病因:收缩 / 舒张功能障碍、左心室流出道梗阻、二尖瓣狭窄等。
  2. 非心源性病因:弥散性肺泡出血、药物过量(阿片类、水杨酸盐)、肺栓塞、病毒感染、TRALI 等。

四、治疗

(一)病因治疗(关键)

  • 输液过量:停止 / 减慢输液;尿毒症:透析治疗;感染:抗感染;毒气吸入:脱离环境 + 解毒剂;药物过量:洗胃 + 对抗药。

(二)药物治疗

  1. 吗啡:5-10mg 皮下 / 静脉注射,减轻焦虑、扩张血管,心源性肺水肿效果佳,休克、呼吸抑制者禁用。
  2. 利尿剂:呋塞米静脉注射,快速利尿减少循环血量,血容量不足者禁用。
  3. 扩血管药:硝普钠、α 受体拮抗剂,降低心脏前后负荷,维持动脉血压正常。
  4. 强心药:毒毛花苷 K、毛花苷 C,适用于快速房颤 / 扑动诱发的肺水肿(两周未用洋地黄者)。
  5. 糖皮质激素:用于高原性、中毒性肺水肿,减轻炎症反应,争议性使用。

(三)其他治疗

  1. 氧疗:面罩高浓度给氧,湿化器加乙醇 / 硅酮消除泡沫,低氧血症难纠正时机械通气。
  2. 减少肺循环血量:坐位双腿下垂,或四肢轮流扎止血带(每 20 分钟放松一肢体 5 分钟),休克、贫血者禁用。

五、预后

  • 肺水肿为急性失代偿状态,症状控制依赖氧疗、利尿剂等对症措施,复发预防关键在病因根治。
  • 预后因病因而异,ARDS 等晚期状态预后已逐步改善,个体死亡率难以量化。

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  1. CONNECT:[ UseTime:0.001175s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001849s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000741s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000650s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001473s ]
  6. SELECT * FROM `set` [ RunTime:0.008731s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001679s ]
  8. SELECT * FROM `article` WHERE `id` = 482245 LIMIT 1 [ RunTime:0.029130s ]
  9. UPDATE `article` SET `lasttime` = 1775840329 WHERE `id` = 482245 [ RunTime:0.015892s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001799s ]
  11. SELECT * FROM `article` WHERE `id` < 482245 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003907s ]
  12. SELECT * FROM `article` WHERE `id` > 482245 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004422s ]
  13. SELECT * FROM `article` WHERE `id` < 482245 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007108s ]
  14. SELECT * FROM `article` WHERE `id` < 482245 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.017565s ]
  15. SELECT * FROM `article` WHERE `id` < 482245 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022348s ]
0.255912s