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药物性肾损害的发病原因

2019-03-29 阅读量:3618次
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肾脏易发生药源性损害的原因肾脏对药物毒性反应较为敏感,其原因主要有:

1、肾脏血流量丰富:肾脏血流量丰富:占心输出量的20%~25%。按单位面积计算是各器官血流量较大的一个,因而较多的药物可进入肾脏。

2、肾内毛细血管的表面积大:肾内毛细血管的表面积大:易发生抗原-抗体复合物的沉积。

3、排泄物浓度高:排泄物浓度:作用于肾小管表面的排泄物浓度高,这是由于对血流浓缩系统的作用所致。此外近端小管对多种药物有分泌和重吸收作用也增加了药物与肾小管上皮细胞的作用机会。

4、肾小管的代谢率高:肾小管的代谢率高:在其分泌和重吸收过程中药物常集中于肾小管表面或细胞内易发生药物中毒。

5、对药物敏感:对药物敏感:肾脏耗氧量大对缺血缺氧敏感。因此对影响血流的药物敏感。

6、易感性:易感性:肾脏疾病增加了对药物损害的易感性,低白蛋白血症增加了游离型药物的浓度,肾功能不全又使药物的半衰期延长,肾脏疾病以及特殊人群如婴幼儿老龄人的肾脏储备功能较低。

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2019-03-29

药物性肾损伤的症状

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