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【853】胰岛素.ppt

  • 2026-04-26 08:40:39
【853】胰岛素.ppt

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先看看我写的学习笔记,PPT往下翻。

一、糖尿病基础概述

  • 疾病定义
    • 多病因引起、以慢性高血糖为特征的代谢性疾病
    • 长期高血糖可造成眼、肾、神经、心脏、血管等慢性病变
  • 发病机制
    • 胰岛素分泌不足:胰岛 β 细胞产生胰岛素数量不足
    • 胰岛素利用缺陷:细胞对胰岛素不敏感,出现胰岛素抵抗
  • 糖尿病分型
    • 1 型糖尿病:胰岛 β 细胞破坏,胰岛素绝对缺乏,青少年多见,需终身胰岛素
    • 2 型糖尿病:以胰岛素抵抗为主伴分泌不足,成人多见,占比 90% 以上
    • 其他特殊类型糖尿病:基因缺陷、胰腺疾病、药物、感染等引起
    • 妊娠期糖尿病:孕期首次发生的糖代谢异常,产后多可恢复

二、糖尿病治疗策略

  • 1 型糖尿病
    • 核心为胰岛素替代治疗,需终身使用外源性胰岛素
    • 给药方式:每日多次皮下注射或胰岛素泵持续输注
  • 2 型糖尿病
    • 基础:生活方式干预,包括饮食控制与规律运动
    • 药物:口服降糖药为主,控制不佳时联合胰岛素
  • 新型治疗方向
    • 双靶点 / 多靶点药物,兼顾控糖与靶器官保护
    • 胰岛细胞移植与干细胞治疗,可重建胰岛素分泌功能

三、胰岛素化学结构

  • 本质为酸性蛋白质,由 A、B 两条多肽链组成
    • A 链含 21 个氨基酸,B 链含 30 个氨基酸
    • 两条链通过两个二硫键连接
  • 来源与制备
    • 传统来源:猪、牛胰腺提取
    • 现代来源:DNA 重组技术合成人胰岛素
    • 我国里程碑:1965 年首次人工合成结晶牛胰岛素

四、胰岛素体内过程

  • 给药方式:口服无效,易被消化酶破坏,必须注射给药
  • 吸收特点:皮下注射吸收快,腹壁、前臂外侧吸收最佳
  • 半衰期:t₁/₂约 10 分钟,作用可维持数小时
  • 灭活部位:主要在肝脏、肾脏灭活
  • 排泄:约 10% 以原形从尿液排出
  • 影响因素:严重肝肾功能不全可影响胰岛素灭活

五、胰岛素药理作用

  • 降血糖作用
    • 促进糖原合成与储存,加速葡萄糖氧化与酵解
    • 抑制糖原分解和糖异生,减少血糖来源
  • 调节脂肪代谢
    • 促进脂肪合成,抑制脂肪分解
    • 减少游离脂肪酸与酮体生成
  • 调节蛋白质代谢
    • 促进氨基酸转运与蛋白质合成
    • 抑制蛋白质分解
  • 其他作用
    • 加快心率、增强心肌收缩力
    • 促进钾离子内流,降低血钾水平

六、胰岛素作用机制

  • 作用方式:不进入靶细胞,仅与细胞膜受体结合发挥作用
  • 受体结构:由 2 个 α 亚单位和 2 个 β 亚单位组成
    • α 亚单位位于胞外,负责结合胰岛素
    • β 亚单位为跨膜蛋白,胞内段含酪氨酸蛋白激酶
  • 信号传导
    • 胰岛素与 α 亚单位结合,引发 β 亚基自身磷酸化
    • 激活酪氨酸蛋白激酶,启动细胞内磷酸化级联反应
    • 最终产生降血糖等生物效应

七、胰岛素临床应用

  • 1 型糖尿病:首选且必须终身使用胰岛素
  • 2 型糖尿病
    • 新诊断且血糖、糖化血红蛋白显著升高者
    • 饮食 + 口服药控制不佳者
  • 糖尿病急性并发症
    • 糖尿病酮症酸中毒:首选胰岛素治疗
    • 高渗性非酮症昏迷:小剂量胰岛素平稳降糖
  • 合并特殊情况的糖尿病
    • 重度感染、高热、创伤、手术、妊娠期
  • 细胞内缺钾:胰岛素联合葡萄糖,促进钾离子内流

八、胰岛素制剂分类

  • 按来源 / 结构
    • 动物胰岛素、人胰岛素、胰岛素类似物
  • 按作用时间
    • 速效胰岛素:赖脯、门冬、谷赖胰岛素,起效 10~20 分钟,维持 3~5 小时
    • 短效胰岛素:普通胰岛素,起效 30~60 分钟,维持 6~8 小时,可静脉注射
    • 中效胰岛素:低精蛋白锌胰岛素,提供基础胰岛素
    • 长效胰岛素:甘精、地特、德谷胰岛素,作用≥24 小时,平稳无峰值
    • 预混胰岛素:短效 / 速效 + 中效,兼顾空腹与餐后血糖

九、胰岛素不良反应

  • 低血糖症
    • 原因:胰岛素过量
    • 表现:饥饿、出汗、心慌、震颤,严重可昏迷、休克
    • 处理:轻者口服糖水,重者静注 50% 葡萄糖
  • 过敏反应
    • 原因:制剂不纯或动物胰岛素抗原性
    • 表现:局部红肿,偶见过敏性休克
    • 处理:更换人胰岛素,对症使用抗组胺药或糖皮质激素
  • 胰岛素抵抗
    • 急性抵抗:应激状态导致,需短期大剂量胰岛素
    • 慢性抵抗:每日用量>200U,与受体、抗体等相关
  • 脂肪萎缩:注射部位皮下脂肪萎缩,更换高纯度胰岛素可改善

十、胰岛素药物相互作用

  • 增强降糖作用
    • 乙醇、口服降糖药与胰岛素协同降糖
  • 拮抗降糖作用
    • 糖皮质激素、甲状腺激素、肾上腺素、噻嗪类利尿药升高血糖
  • 增加低血糖风险
    • β 受体阻断药可掩盖低血糖症状,延误识别

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  1. CONNECT:[ UseTime:0.000419s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000642s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006477s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.014299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000751s ]
  6. SELECT * FROM `set` [ RunTime:0.017912s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000700s ]
  8. SELECT * FROM `article` WHERE `id` = 501767 LIMIT 1 [ RunTime:0.032076s ]
  9. UPDATE `article` SET `lasttime` = 1777530254 WHERE `id` = 501767 [ RunTime:0.014497s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000307s ]
  11. SELECT * FROM `article` WHERE `id` < 501767 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001087s ]
  12. SELECT * FROM `article` WHERE `id` > 501767 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005573s ]
  13. SELECT * FROM `article` WHERE `id` < 501767 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008257s ]
  14. SELECT * FROM `article` WHERE `id` < 501767 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.043328s ]
  15. SELECT * FROM `article` WHERE `id` < 501767 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010494s ]
0.235903s