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【811】巨幼细胞性贫血.ppt

  • 2026-04-05 00:58:53
【811】巨幼细胞性贫血.ppt

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先看看我写的学习笔记,PPT往下翻。

一、概述

  • 本质:DNA 合成障碍导致的贫血
  • 主要原因:叶酸缺乏和 / 或维生素 B12 缺乏
  • 血象:大细胞性贫血(MCV↑)
  • 骨髓:三系巨幼变,特征为核幼浆老
  • 别称:幼红细胞增殖异常性贫血

二、分类

  1. 按缺乏物质
    • 单纯叶酸缺乏
    • 单纯维生素 B12 缺乏
    • 两者同时缺乏
  2. 按病因
    • 摄入不足
    • 吸收不良
    • 代谢异常
    • 需要量增加
    • 利用障碍

三、流行病学

  • 地区性高发:山西、陕西(患病率 5.3%)
  • 恶性贫血在我国少见

四、病因与发病机制

(一)叶酸相关

  1. 代谢要点
    • 结构:蝶啶 + 对氨基苯甲酸 + 谷氨酸
    • 来源:新鲜蔬果、肉类,长时间烹煮丢失 50%~90%
    • 吸收部位:十二指肠、近端空肠
    • 每日需量:200μg
    • 活化:形成 N⁵- 甲基四氢叶酸,为 DNA 合成提供一碳单位
    • 储存:5~20mg,半数在肝
  2. 缺乏原因
    • 摄入减少:偏食、烹调不当
    • 需要量增加:妊娠、儿童、溶血、甲亢、透析
    • 吸收障碍:小肠疾病、乙醇、抗癫痫药、柳氮磺吡啶
    • 利用障碍:甲氨蝶呤、甲氧苄啶等药物
    • 排出增加:透析、酗酒

(二)维生素 B12 相关

  1. 代谢要点
    • 来源:动物肝、肾、肉、蛋、乳
    • 吸收部位:回肠末端,需内因子参与
    • 每日需量:1μg
    • 储存:2~5mg,主要在肝,可维持 10~15 年
  2. 缺乏原因
    • 摄入减少:长期素食
    • 吸收障碍(最常见):胃切除、恶性贫血、胰酶缺乏、肠道疾病、二甲双胍等药物
    • 利用障碍:转钴蛋白 Ⅱ 缺乏、氧化亚氮

(三)发病机制核心

  1. 叶酸 / B12 缺乏→dTTP 合成减少→DNA 合成障碍
  2. 细胞:核发育落后于胞质→巨幼变
  3. 骨髓:红系、粒系、巨核系三系受累→全血细胞减少
  4. B12 缺乏特有:神经髓鞘合成障碍→神经系统症状

五、临床表现

  1. 血液系统
    • 起病缓慢,苍白、乏力、头晕、心悸
    • 重症全血细胞减少→感染、出血
    • 轻度黄疸
  2. 消化系统
    • 牛肉样舌
      (舌乳头萎缩、光滑疼痛)
    • 食欲差、恶心、腹胀、腹泻
  3. 神经精神(多见于 B12 缺乏)
    • 肢体麻木、深感觉障碍、共济失调
    • 抑郁、失眠、记忆力下降、幻觉
    • 警示:单纯补叶酸会加重神经症状

六、实验室检查

  1. 血象
    • 大细胞性贫血:MCV↑、MCH↑、MCHC 正常
    • 中性粒细胞核分叶过多(≥5 叶 > 5%)
    • 可见大椭圆形红细胞
    • 重症全血细胞减少
  2. 骨髓象
    • 增生活跃,红系显著增生
    • 巨幼变,核幼浆老
    • 粒系、巨核系亦巨幼变
  3. 生化指标
    • 血清叶酸 < 6.8nmol/L
    • 红细胞叶酸 < 227nmol/L
    • 血清维生素 B12<74pmol/L
  4. 其他
    • 恶性贫血:内因子抗体阳性
    • 间接胆红素可轻度升高

七、诊断要点

  1. 有叶酸 / B12 缺乏病因 + 临床表现
  2. 外周血:大细胞贫血、粒细胞核分叶过多
  3. 骨髓:典型巨幼变
  4. 血清叶酸 / B12 降低
  5. 试验性治疗:1 周左右网织红细胞上升

八、鉴别诊断

  • 骨髓增生异常综合征、急性红白血病
  • 自身免疫性溶血性贫血
  • 多发性骨髓瘤(MCV 假性偏高)
  • 甲状腺功能减退症

九、治疗

  1. 治疗原发病:胃肠疾病、停药可疑药物
  2. 补充治疗
    • 叶酸缺乏:口服 5~10mg,每日 3 次,至贫血纠正
    • B12 缺乏:肌注 500μg,每周 2 次;神经受累者维持半年~1 年;恶性贫血终身用药
  3. 关键:两者同缺必须同时补充,禁单用叶酸

十、预防

  • 纠正偏食与不当烹调习惯
  • 婴幼儿及时添加辅食
  • 孕妇、青少年补充叶酸 / B12
  • 化疗等用药者预防性补充

十一、预后

  • 多数预后良好
  • 网织红细胞 5~7 天上升,Hb1~2 个月恢复
  • 神经系统症状恢复慢,可遗留后遗症

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  1. CONNECT:[ UseTime:0.000484s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000921s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000335s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000621s ]
  8. SELECT * FROM `article` WHERE `id` = 495945 LIMIT 1 [ RunTime:0.000522s ]
  9. UPDATE `article` SET `lasttime` = 1775344788 WHERE `id` = 495945 [ RunTime:0.001021s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000294s ]
  11. SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000447s ]
  12. SELECT * FROM `article` WHERE `id` > 495945 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000381s ]
  13. SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000988s ]
  14. SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001106s ]
  15. SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000901s ]
0.076634s