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临床学习笔记|尿量异常

  • 2026-04-21 23:59:48
临床学习笔记|尿量异常

前面为知识点部分,后面为PPT

一、尿量基本定义

- 正常24h尿量:1000~2000 ml

- 少尿:24h <400 ml 或 <0.5 ml·kg⁻¹·h⁻¹

- 无尿:24h <100 ml

- 多尿:24h >2500 ml

- 夜尿增多:夜尿>750ml 或 夜间尿量>白天尿量

二、尿量异常分类

三大病因:肾前性 → 肾性 → 肾后性

临床思路口诀:

先看梗阻,再看灌注,最后看肾实质

(一)少尿和无尿

肾前性

核心:肾脏本身无器质性病变,仅为肾灌注不足

有效循环血量不足 → 肾灌注下降 → GFR降低

肾小管完好,强力重吸收钠水

1. 病理生理要点

- 有效动脉血容量减少 → 肾血流量(RBF)↓ → GFR ↓

- 肾小管重吸收钠、水代偿性增强

- 早期为功能性改变,及时纠正可完全恢复

- 持续不纠正 → 进展为急性肾小管坏死(ATN)

2. 病因

(1)有效循环血量绝对不足

- 胃肠道丢失:呕吐、腹泻、胃肠减压引流

- 肾脏丢失:利尿剂过量、渗透性利尿、肾上腺皮质功能不全

- 皮肤黏膜丢失:大量出汗、烧伤

- 出血:消化道出血、创伤出血、术后出血、产后大出血

- 第三间隙丢失:胰腺炎、腹膜炎、肝硬化腹水、严重低蛋白血症

(2)心输出量降低

- 急性心力衰竭、急性心肌梗死

- 严重心律失常

- 心包填塞、限制性心肌病

- 肺栓塞致右心衰竭

(3)全身血管扩张

- 脓毒症休克

- 过敏性休克

- 肝衰竭(肝肾综合征)

- 降压药过量、麻醉药物

(4)肾血管收缩/肾血流自身调节异常

- 非甾体抗炎药(NSAIDs)抑制前列腺素扩张血管作用

- ACEI/ARB 阻断出球小动脉代偿性收缩

- 去甲肾上腺素、血管加压素过量

- 肝肾综合征(强烈肾皮质血管收缩)

3. 临床特点

- 常有脱水、低血压、休克、心衰、肝病等病史

- 尿色深、尿少

- 一般无明显蛋白尿、血尿

- 补液后尿量可迅速增加

4. 实验室指标(核心鉴别)

- 尿比重:>1.020

- 尿渗透压:>500 mOsm/kg H₂O

- 尿钠浓度:<20 mmol/L

- 钠排泄分数 FeNa:<1%

- 尿素氮/肌酐比值:>20:1

- 尿常规:基本正常,偶见透明管型

- 尿沉渣:无明显异常

肾性

核心:肾实质本身发生器质性损害

分为四类:肾小管、肾小球、肾间质、肾血管

1. 急性肾小管坏死(ATN,最常见)

病因

-缺血性 ATN

肾前性持续进展、严重低血压、休克、大手术、心肺复苏后

-肾毒性 ATN

外源性毒素:氨基糖苷类、万古霉素、顺铂、造影剂、重金属

内源性毒素:横纹肌溶解(肌红蛋白)、溶血(血红蛋白)、尿酸结晶(肿瘤溶解)

典型表现

- 少尿期(常1~2周)→ 多尿期 → 恢复期

- 尿比重固定、低渗尿

2. 肾小球疾病所致AKI

- 急进性肾小球肾炎(RPGN Ⅰ、Ⅱ、Ⅲ型)

- 重症狼疮性肾炎(Ⅳ型)

- ANCA相关性小血管炎肾损害

- IgA肾病急进性发作

- 感染后肾小球肾炎重症型

特点:明显血尿、蛋白尿、红细胞管型、高血压、水肿

3. 急性间质性肾炎(AIN)

主要病因

- 药物过敏:β内酰胺类、磺胺、喹诺酮、NSAIDs、利尿剂

- 感染:肾盂肾炎、EB病毒、钩端螺旋体等

- 自身免疫性疾病

特点:发热、皮疹、关节痛、嗜酸性粒细胞增多、尿嗜酸性粒细胞阳性

4. 肾血管性疾病

- 肾动脉栓塞/血栓形成

- 肾静脉血栓

- 溶血尿毒综合征(HUS)、血栓性血小板减少性紫癜(TTP)

- 硬皮病肾危象

- 妊娠相关高血压肾损害

肾性AKI 实验室特征

- 尿比重:1.010左右,等渗尿

- 尿渗透压:<350 mOsm/kg

- 尿钠:>40 mmol/L

- FeNa:>2%

- 尿沉渣:颗粒管型、上皮细胞管型、红细胞管型、白细胞管型

- 尿素氮/肌酐:<10~15:1

肾后性

核心:尿路梗阻 → 肾内压力升高 → GFR下降

必须双侧梗阻或孤立肾单侧梗阻才会出现少尿/无尿

1. 病因(按部位)

(1)尿道/膀胱颈梗阻

- 前列腺增生、前列腺癌

- 膀胱颈挛缩

- 尿道狭窄、血块阻塞

- 神经源性膀胱

(2)输尿管梗阻

- 输尿管结石

- 血块、坏死肾乳头脱落

- 腹膜后纤维化

- 盆腔肿瘤压迫(宫颈癌、直肠癌、卵巢癌)

- 医源性:手术误扎输尿管

(3)肾盂梗阻

- 先天性肾盂输尿管连接部狭窄

- 肿瘤、血块

2. 临床特点

- 可突发无尿,或尿量骤减、时有时无

- 腰痛、腹痛、肾绞痛

- 膀胱区胀满(下尿路梗阻)

- 解除梗阻后常出现梗阻后多尿(大量利尿、易低钾)

3. 辅助检查

- 泌尿系超声:肾盂积水、输尿管扩张(首选)

- 泌尿系CT/CTU

- 膀胱残余尿测定

- 导尿可立即鉴别下尿路梗阻

4. 实验室特点

早期指标可类似肾前性,后期接近肾性,无固定模式

诊断不靠化验,靠影像学+体格检查

肾前性,肾性,肾后性少尿对比表

临床诊断思路

1. 确认真少尿

排除导尿管堵塞、脱出、尿液外漏

2. 先排除肾后性(最快最重要)

- 触诊膀胱是否充盈

- 试行导尿

- 立即泌尿系B超看有无积水

有积水 → 肾后性,尽快解除梗阻

3. 再鉴别肾前性 vs 肾性

- 看病史:有无脱水、失血、休克、心衰

- 看体征:血压、皮肤弹性、颈静脉

- 看尿指标:比重、尿钠、FeNa、沉渣

- 补液试验:快速补液后尿量↑ → 肾前性

4. 肾性AKI再分型

- 红细胞管型 → 肾小球/血管炎

- 嗜酸细胞 → 间质性肾炎

- 颗粒管型 → ATN

- 肌红蛋白尿 → 横纹肌溶解

5. 紧急处理优先于明确诊断

高钾、肺水肿、严重代酸 → 立即抢救,不等待检查

(二)多尿

两大类机制

1. 溶质性利尿

尿中溶质过多 → 带走水分

糖尿病、甘露醇、造影剂、高蛋白、急性肾衰多尿期、梗阻后利尿

2. 水利尿(ADH异常)

水重吸收障碍 → 排出大量低渗尿

- 中枢性尿崩:ADH缺乏

- 肾性尿崩:对ADH不敏感(锂、低钾、高钙)

- 精神性多饮

关键特点

- 大量低比重尿

- 尿比重<1.005,尿渗透压<200

- 烦渴、夜尿显著

一句话临床总诀

尿少先查梗阻与膀胱,

再看灌注肾前伤,

比重高钠低是肾前,

比重低钠高是肾伤,

B超积水是梗阻,

补液有效最直观。

PPT

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  1. CONNECT:[ UseTime:0.000654s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001086s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000480s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000326s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000448s ]
  6. SELECT * FROM `set` [ RunTime:0.000173s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000475s ]
  8. SELECT * FROM `article` WHERE `id` = 482758 LIMIT 1 [ RunTime:0.000639s ]
  9. UPDATE `article` SET `lasttime` = 1776798135 WHERE `id` = 482758 [ RunTime:0.001710s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000221s ]
  11. SELECT * FROM `article` WHERE `id` < 482758 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000424s ]
  12. SELECT * FROM `article` WHERE `id` > 482758 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000942s ]
  13. SELECT * FROM `article` WHERE `id` < 482758 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000612s ]
  14. SELECT * FROM `article` WHERE `id` < 482758 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000726s ]
  15. SELECT * FROM `article` WHERE `id` < 482758 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000821s ]
0.075587s