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衰老也可引起贫血

来源:[标签:来源] | 发布时间:2011-07-24 11:18:16 | www.chinesejk.com

  造血功能降低:随着年龄增长,骨髓内干细胞有逐渐衰竭的可能,从而使老年人造血功能明显降低,红细胞数量减少。
  红细胞生成素水平下降:随着增龄而发生肾血流量减少及睾丸酮分泌减少,使红细胞数和血红蛋白值下降,尤以男性明显。

  红细胞寿命缩短:老年人红细胞内酶活性及代谢低下、红细胞变形能力低下以及免疫功能趋向衰退而失去自我识别能力,加速红细胞破坏。

  胃壁细胞萎缩及肠道吸收功能衰退:老年人胃壁细胞萎缩、胃酸分泌减少,从而影响维生素B12和铁的吸收,由此导致贫血。

  食物摄入量减少:老年人味觉和嗅觉减低、牙齿脱落咀嚼困难,均可影响多种营养物质的摄取,从而导致维生素B12、叶酸和铁剂缺乏引起贫血。

(编辑:小珊 )

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