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【881】甲状腺功能减退症2026.ppt

  • 2026-11-05 00:55:38
【881】甲状腺功能减退症2026.ppt

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PPT页数:22页
先看看我写的学习笔记,PPT往下翻。

一、疾病概述

  1. 核心定义
    • 由各种原因导致甲状腺激素合成和分泌减少,或组织利用不足引起的全身性低代谢综合征
    • 可累及全身多系统,出现功能减退表现
  2. 流行病学
    • 临床甲减患病率:0.3%~1.0%
    • 亚临床甲减患病率:约 4%
    • 患病率随年龄增长升高,女性显著高于男性
  3. 甲状腺基础信息
    • 解剖位置:颈部前方、气管两旁,呈蝴蝶状,为人体最大内分泌腺体之一
    • 核心功能:合成与分泌 T3、T4,调节机体代谢与生长发育,通过下丘脑 - 垂体 - 甲状腺轴维持稳态

二、疾病分类

  1. 按病变部位分型
    • 原发性甲减:占 99% 以上,病变在甲状腺本身,病因含自身免疫损伤、手术、放射性碘治疗等
    • 中枢性甲减:病变在下丘脑或垂体,因 TRH/TSH 分泌减少所致
    • 甲状腺激素抵抗综合征:病变在外周组织靶器官,T3/T4 正常但效应障碍
  2. 按功能程度分级
    • 临床甲减:甲状腺功能明显受损,有典型症状,TSH 升高、FT4/TT4 降低
    • 亚临床甲减:功能轻度受损,多无明显症状,TSH 升高、FT4/TT4 正常
  3. 病因分类
    • 原发性甲减:获得性含自身免疫性甲状腺炎、甲状腺破坏、药物等;先天性含甲状腺发育异常、激素合成障碍等
    • 中枢性甲减:获得性含垂体 / 下丘脑肿瘤、手术、炎症等;先天性含 TSH 缺乏或结构异常
    • 外周性甲减:含甲状腺激素抵抗综合征、基因突变、消耗性甲减等

三、病理改变

  1. 甲状腺与垂体病理
    • 慢性淋巴细胞性甲状腺炎:大量淋巴细胞浸润,滤泡破坏、纤维组织增生
    • 原发性甲减:甲状腺激素减少,对垂体反馈抑制减弱,TSH 细胞增生肥大
  2. 全身结缔组织病理
    • 发病机制:甲减时黏多糖分解减慢,在皮肤及结缔组织异常沉积
    • 病理表现:黏多糖亲水性强,结合水分形成非凹陷性水肿
    • 临床关联:引发颜面浮肿、声音嘶哑、皮肤粗糙等典型症状

四、临床表现

  1. 病史与核心症状
    • 病史线索:甲状腺手术史、¹³¹I 治疗史、自身免疫病史、特殊用药史
    • 核心特征:起病隐匿、病程漫长,基础代谢率减低、交感神经兴奋性下降
    • 典型全身症状:乏力、畏寒、少汗、体重增加、嗜睡、记忆力减退、便秘等
  2. 特殊人群与体征
    • 生殖系统:女性月经紊乱、不孕;男性性欲减退、精子减少
    • 黏液性水肿面容:表情呆滞、颜面非凹陷性水肿、声音嘶哑、呈假面具样
  3. 黏液性水肿昏迷
    • 定义:甲减最严重并发症,属于内分泌急症
    • 诱因:寒冷、感染、中断治疗、手术、麻醉等
    • 表现:嗜睡、低体温<35℃、呼吸减慢、心动过缓、昏迷休克,可并发心肾衰竭
  4. 体格检查
    • 一般体征:表情呆滞、面色苍白、听力障碍
    • 皮肤毛发:干燥发凉、掌部姜黄色,毛发稀疏、眉毛外 1/3 脱落
    • 其他:脉率缓慢、跟腱反射松弛期延长

五、诊断与鉴别诊断

  1. 实验室检查
    • 核心指标:TSH 为最敏感指标;临床甲减 FT4/TT4 降低,亚临床甲减 FT4/TT4 正常
    • 自身抗体:TPOAb、TgAb 阳性提示自身免疫性甲状腺炎
    • 其他检查:血常规示轻中度贫血,血生化胆固醇、心肌酶升高,影像学可见垂体增大
  2. 诊断标准
    • 原发性甲减:TSH 升高,FT4/TT4 降低
    • 亚临床甲减:TSH 升高,FT4/TT4 正常
    • 中枢性甲减:TSH 降低或正常,FT4/TT4 降低
  3. 鉴别诊断
    • 贫血:结合甲状腺功能检查与其他贫血区分
    • 水肿:与肾病所致水肿鉴别,依据肾功能及甲功指标
    • 低 T3 综合征:非甲状腺疾病所致,rT3 升高,与中枢性甲减鉴别
    • 蝶鞍增大:与垂体催乳素瘤鉴别,甲状腺素治疗后可恢复
    • 心包积液:甲减所致者经激素治疗可恢复

六、治疗方案

  1. 甲状腺激素替代治疗
    • 首选药物:左甲状腺素 L-T4,半衰期长、浓度稳定,每日服药 1 次
    • 核心原则:个体化给药、达标治疗,多数需终身服药
    • 剂量标准:成人临床甲减 1.6~1.8μg/(kg・d),老年 1.0μg/(kg・d),妊娠需增 30%~50%
    • 监测随访:初期每 4~6 周复查,达标后每 6~12 个月复查;中枢性甲减按 FT4 调整剂量
  2. 其他治疗
    • 一般治疗:纠正贫血、补充铁剂、叶酸,缺碘者补充碘剂
  3. 黏液性水肿昏迷抢救
    • 补充甲状腺激素:首选 L-T3 静脉注射或 L-T4 鼻饲
    • 生命支持:保温、吸氧、保持呼吸道通畅
    • 糖皮质激素:氢化可的松静脉滴注
    • 维持内环境:控制入水量、纠正低钠血症
    • 对症处理:控制感染、治疗原发病

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    1. CONNECT:[ UseTime:0.000773s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000991s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000453s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000341s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000686s ]
    6. SELECT * FROM `set` [ RunTime:0.000280s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000711s ]
    8. SELECT * FROM `article` WHERE `id` = 566454 LIMIT 1 [ RunTime:0.000370s ]
    9. UPDATE `article` SET `lasttime` = 1794201286 WHERE `id` = 566454 [ RunTime:0.001468s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000381s ]
    11. SELECT * FROM `article` WHERE `id` < 566454 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000507s ]
    12. SELECT * FROM `article` WHERE `id` > 566454 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000390s ]
    13. SELECT * FROM `article` WHERE `id` < 566454 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000630s ]
    14. SELECT * FROM `article` WHERE `id` < 566454 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000524s ]
    15. SELECT * FROM `article` WHERE `id` < 566454 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001096s ]
    0.086834s