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【961】局部麻醉.ppt

  • 2026-05-31 22:26:33
【961】局部麻醉.ppt

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先看看我写的学习笔记,PPT往下翻。

一、局部麻醉概述

  1. 定义
    • 局部麻醉药暂时阻断周围神经冲动传导,使支配区域产生麻醉作用
    • 广义包含椎管内麻醉,患者意识保持清醒
  2. 特点与适用
    • 适用于表浅、局限部位手术
    • 需熟悉局部解剖、局麻药药理与规范操作

二、局部麻醉药

(一)分类

  1. 酯类
    • 代表药物:普鲁卡因、丁卡因
    • 代谢:血浆假性胆碱酯酶水解
  2. 酰胺类
    • 代表药物:利多卡因、布比卡因、罗哌卡因
    • 代谢:肝脏线粒体酶水解

(二)理化性质与麻醉性能

  1. 三大关键指标
    • pKa:数值越大,起效越慢
    • 脂溶性:越高,麻醉效能越强
    • 血浆蛋白结合率:越高,作用时间越长
  2. 常用药物特点
    • 普鲁卡因:脂溶性低、短效、毒性弱,仅用于局部浸润
    • 丁卡因:脂溶性高、强效长效、毒性大,用于表面麻醉
    • 利多卡因:中效、应用最广,可用于多种局麻方式
    • 布比卡因:强效长效,心脏毒性较大
    • 罗哌卡因:效能接近布比卡因,心脏毒性更低

(三)吸收、分布、代谢

  1. 吸收影响因素
    • 药物剂量、注药部位血供、药物血管扩张作用
    • 加肾上腺素可延缓吸收、延长时效、降低毒性
  2. 分布
    • 先分布至肺,再至血供丰富器官
    • 布比卡因、罗哌卡因不易透过胎盘
  3. 代谢清除
    • 酰胺类:肝脏代谢,肝功能不全需减量
    • 酯类:血浆胆碱酯酶代谢,酶异常者需减量

(四)常用药物临床应用

  1. 普鲁卡因
    • 仅用于局部浸润麻醉,不用于表面麻醉
  2. 丁卡因
    • 黏膜表面麻醉首选,不用于局部浸润
  3. 利多卡因
    • 适用所有局麻方式,成人一次限量表面麻醉 100mg,浸润 / 神经阻滞 400mg
  4. 布比卡因
    • 用于硬膜外阻滞、术后镇痛,心脏毒性较高
  5. 罗哌卡因
    • 优选用于分娩镇痛、外周神经阻滞,低浓度仅阻滞感觉神经

三、局部麻醉方法

(一)表面麻醉

  1. 定义:局麻药透过黏膜阻滞黏膜下神经末梢
  2. 适用部位:眼、鼻、咽喉、气管、尿道、皮肤
  3. 常用药物:丁卡因、利多卡因

(二)局部浸润麻醉

  1. 定义:注入手术区组织阻滞神经末梢
  2. 操作:沿切口做皮丘,逐层浸润
  3. 区域阻滞:环绕手术区注药,适用于肿块切除
  4. 注意事项:注药前回抽,可加肾上腺素,实质脏器无需注药

(三)神经阻滞

  1. 颈神经丛阻滞
    • 解剖:C1-C4 组成,分深丛、浅丛
    • 深丛阻滞:C4 横突单点法、肌间沟法
    • 浅丛阻滞:胸锁乳突肌后缘中点注药
    • 并发症:局麻药毒性、霍纳综合征、喉返神经麻痹、膈神经麻痹
    • 禁忌:双侧深丛阻滞
  2. 臂神经丛阻滞
    • 解剖:C5-C8、T1 组成,支配上肢
    • 阻滞径路:肌间沟、锁骨上、腋径路
    • 适应证:肌间沟用于肩部手术,锁骨上用于肘及前臂手术,腋径路用于前臂及手部手术
    • 并发症:气胸、膈神经麻痹、喉返神经麻痹、全脊髓麻醉
  3. 肋间神经阻滞
    • 操作:肋角处肋骨下缘进针,注药 3-5ml / 肋间
    • 并发症:气胸、局麻药毒性反应
  4. 指(趾)神经阻滞
    • 禁忌:严禁加入肾上腺素,防止组织缺血坏死
  5. 新技术
    • 超声引导:定位精准,减少并发症与用药量

四、并发症及其防治

(一)毒性反应

  1. 原因
    • 超剂量、误入血管、吸收过快、患者耐受差
  2. 临床表现
    • 中枢:眩晕、多语、震颤、惊厥、意识丧失
    • 心血管:血管扩张、心肌抑制、血压下降、心搏骤停
  3. 预防
    • 控制剂量、注药前回抽、酌减体弱患者药量、加用肾上腺素、术前镇静
  4. 救治
    • 立即停药、吸氧、镇静抗惊厥
    • 循环支持:补液、血管活性药
    • 心搏骤停行心肺复苏,使用脂肪乳剂解毒

(二)过敏反应

  1. 特点
    • 酯类多见,酰胺类极罕见
  2. 表现:荨麻疹、喉头水肿、支气管痉挛、低血压
  3. 处理:停药、吸氧、肾上腺素、激素、抗组胺药
  4. 注意:不常规做皮试,酯类过敏改用酰胺类

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  1. CONNECT:[ UseTime:0.000906s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000815s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000359s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000678s ]
  8. SELECT * FROM `article` WHERE `id` = 518310 LIMIT 1 [ RunTime:0.000486s ]
  9. UPDATE `article` SET `lasttime` = 1780620492 WHERE `id` = 518310 [ RunTime:0.011618s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003202s ]
  11. SELECT * FROM `article` WHERE `id` < 518310 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.014667s ]
  12. SELECT * FROM `article` WHERE `id` > 518310 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000562s ]
  13. SELECT * FROM `article` WHERE `id` < 518310 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000890s ]
  14. SELECT * FROM `article` WHERE `id` < 518310 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006235s ]
  15. SELECT * FROM `article` WHERE `id` < 518310 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.059999s ]
0.183943s