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铁粒幼细胞贫血概述

来源:[标签:来源] | 发布时间:2011-06-07 10:29:23 | www.chinesejk.com
铁粒幼细胞性贫血(简称SA。)是一组铁利用障碍性疾病。特征为骨髓中出现大量环状铁粒幼红细胞,红细胞无效生成,组织铁储量过多和外周血呈小细胞低色素性贫血。本病分为获得性和遗传性,还有维生素B6反应性贫血。获得性又分为原发性和继发性。 铁利用不良,血红素合成障碍和红细胞无效生成是本病发病的主要环节。与血红素合成有关的各种梅和辅梅的缺乏,活性减低和活性受阻是本病的发病机理。任何原因影响这些梅的活性均可导致铁利用不良和血红素合成障碍,结果形成低色素性贫血,铁在红细胞及各组织内大量堆积,使红细胞形态及功能受损,致红细胞过早破坏即无效生成。铁大量沉积于各组织内,形成血色病,影响各组织器官功能

(编辑:小珊 )

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