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老年慢性肾盂肾炎是怎么引起的?

2019-03-27 阅读量:4136次
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本病为细菌直接引起的感染性肾脏病变,一般导致老年慢性肾盂肾炎的原因有下面几点: 1、老年免疫功能下降,抵抗感染能力不足,这对泌尿系感染的发病起着重要作用。老年对应激的反应性下降,营养不良(如维生素或锌缺乏)的发生率较高,这可能是导致老年细胞免疫应答下降或延迟的原因。多形核白细胞功能与尿路感染的防御可能有更直接的关系,有糖尿病的老年这类细胞功能有间歇性异常,有骨髓增殖性和淋巴增殖性疾病病人则有持续性的异常。有人发现老年的循环IgM水平下降,老年对多种菌苗所产生的抗体水平一般都低于年轻人。加之正常无菌的泌尿系统,仅含有少量的免疫球蛋白(IGA)、巨噬细胞和吞噬细胞,故对细菌入侵的抵抗力甚低。这样不但泌尿系统容易发生感染,而且往往反复发作,长期迁延。 2、老年常有各种慢性病,使慢性肾盂肾炎发生率增加。神经系统疾病如卒中和老年性痴呆病人个人卫生不良,又易导致大小便失禁,会阴污染使老年女性的菌尿发生率增加。糖尿病人肾盂肾炎发生率较高的诱因可能是高血糖相关的多形核白细胞功能异常,复发性阴道炎和膀胱功能不全等。慢性肾脏病患者的肾内感染可能与肾脏本身局部防御缺陷有关。 3、老年生理性渴感减退,为此饮水减少。同时老年又常因病使用止痛药,非固醇类消炎药等,易导致慢性肾盂肾炎及慢性间质性肾炎。
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2019-03-27

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