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如何辨识尿量异常 ?

2022-12-11 阅读量:3174次
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在人正常的生理过程中,每人每天尿量都不同,造成尿量的差异因素很多,主要取决于饮水、运动、出汗、气候、温度等情况。成人每日尿总量在1000~2000毫升之间,儿童按每公斤体重计算尿量,与成人相比多3~4倍。白天尿量比夜间多。

尿量的多少与肾血流量、肾小球滤过率以及肾小管的重吸收能力有关。尿量过多或过少都是异常现象,应积极查找原因,进行及时诊治。

(1)少尿:24 小时尿量少于 400 毫升或每小时尿量少于 17 毫升称为少尿。24 小时总尿量少干 100 毫升称无尿或尿闭。超过1天的少尿,特别是无尿,应引起重视,积极诊治。其原因可分为:①肾前性:见于各种原因所致的休克、严重脱水或电解质紊乱、心力衰竭、肾动脉栓塞及肿瘤压迫等;②肾性:如急性肾小球肾炎、慢性肾炎急性发作、急性肾功能不全少尿期、各种慢性疾病所致肾功能不全等:③肾后性:各种原因所致的尿路梗阻。

(2)多尿:成年人24小时尿量超过 2500 毫升者称为多尿。暂时性多尿见于饮水过多或充血性心力衰竭水肿病人应用利尿剂后。病理性多尿见于:①内分泌功能障碍,如尿崩症、糖尿病、原发性甲状旁腺机能亢进及原发性醛固酮增多症;②肾脏疾病,如慢性肾盂肾炎、慢性肾炎后期、急性肾功能衰竭、高血压肾病、慢性肾小管功能不全、失钾性肾病、高血钙性肾病等;③精神性多尿,常伴有次数增多。

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