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>【811】巨幼细胞性贫血.ppt
【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
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
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
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
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
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
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
叶酸 / B12 缺乏→dTTP 合成减少→
DNA 合成障碍
细胞:核发育落后于胞质→
巨幼变
骨髓:红系、粒系、巨核系三系受累→
全血细胞减少
B12 缺乏特有:神经髓鞘合成障碍→
神经系统症状
五、临床表现
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
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
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
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
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
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
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
有叶酸 / B12 缺乏病因 + 临床表现
外周血:大细胞贫血、粒细胞核分叶过多
骨髓:典型巨幼变
血清叶酸 / B12 降低
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
治疗原发病:胃肠疾病、停药可疑药物
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
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
需要公众号里的ppt,点我咨询~
需要公众号里的ppt,点我咨询~
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CONNECT:[ UseTime:0.000484s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000921s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000335s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000306s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
SELECT * FROM `set` [ RunTime:0.000200s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.000621s ]
SELECT * FROM `article` WHERE `id` = 495945 LIMIT 1 [ RunTime:0.000522s ]
UPDATE `article` SET `lasttime` = 1775344788 WHERE `id` = 495945 [ RunTime:0.001021s ]
SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000294s ]
SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000447s ]
SELECT * FROM `article` WHERE `id` > 495945 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000381s ]
SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000988s ]
SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001106s ]
SELECT * FROM `article` WHERE `id` < 495945 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000901s ]
0.076634s