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【174】水、钠代谢紊乱.ppt

  • 2026-04-04 22:13:20
【174】水、钠代谢紊乱.ppt

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先看看我写的学习笔记,PPT往下翻。

一、水、钠的正常代谢

(一)水的生理功能与水平衡

  1. 生理功能:水是生化反应场所与溶剂,能促进物质代谢;通过比热大、蒸发热大及流动性强调节体温;泪液、唾液等发挥润滑作用;部分水与蛋白质结合形成结合水,参与生理功能。
  2. 水平衡:每日饮水量 1000-1300ml,食物水 700-900ml,代谢水约 300ml;排出途径包括消化道 150ml、皮肤非显性蒸发 500ml(显性出汗含电解质)、肺呼吸蒸发 350ml、肾排尿 1000-1500ml。成人每日最低排水量 1500ml,日需水量 1500-2000ml 以维持平衡。

(二)电解质与钠平衡

  1. 电解质:分有机(如蛋白质)和无机电解质(如 K⁺、Na⁺、Cl⁻等),能维持体液渗透压、酸碱平衡,参与神经肌肉细胞电位形成及新陈代谢。
  2. 钠平衡:成人含钠总量 40-50mmol/kg,50% 在细胞外液,10% 在细胞内液,血清 Na⁺参考范围 135-145mmol/L。每日摄入钠 100-200mmol(主要来自食盐),几乎全部经小肠吸收,主要经肾随尿排出,遵循 “多吃多排,少吃少排” 原则,汗液也排出少量钠。

(三)体液容量及渗透压调节

  1. 调节机制:通过神经 - 内分泌系统实现,渗透压感受器位于下丘脑视上核和室旁核,渗透压 1%-2% 变动即影响抗利尿激素(ADH)释放。渗透压升高时,刺激口渴中枢并促使 ADH 分泌,加强水重吸收,抑制醛固酮;渗透压降低时,抑制 ADH 分泌,促进醛固酮,减少 Na⁺排出。
  2. 影响因素与体液因子:血容量减少时优先维持血容量;精神紧张、药物等可影响 ADH。心房钠尿肽(ANP)可调节水钠代谢;水通道蛋白(AQP)有多种亚型,如 AQP2 缺陷致尿崩症,AQP4 与脑水肿相关。ADH 通过结合 V₂受体,激活信号通路,调节 AQP2 分布以控制水重吸收。

二、水、钠代谢紊乱的分类

(一)概述

紊乱分为脱水(低渗性、高渗性、等渗性)、水中毒、水肿。脱水是细胞外液减少引发的代谢障碍症候群,常伴血钠和渗透压变化;水中毒是水潴留致体液量增多、稀释性低钠血症;水肿是液体在组织间隙或体腔内积聚。

(二)脱水

  1. 发病机制
    • 低渗性脱水:失钠多于失水,血清 Na⁺<135mmol/L,血浆渗透压 < 290mmol/L,多因肾内、肾外失液后仅补水,如消化道失液、大量出汗等。
    • 高渗性脱水:失水多于失钠,血清 Na⁺>150mmol/L,血浆渗透压 > 310mmol/L,因水摄入减少(如水源断绝)或丢失过多(如过度通气、高热、尿崩症),ICU 患者中发病率高,是死亡独立危险因素。
    • 等渗性脱水:水钠成比例丢失,血钠和渗透压正常,常见于呕吐、大面积烧伤,不处理可转为高渗性,补过多低渗液可转为低渗性。
  2. 临床表现
    • 低渗性脱水:早期循环血容量不足、尿量减少,无口渴,轻度缺钠有疲乏、尿少,中度有恶心、肌肉痉挛,重度致细胞水中毒。
    • 高渗性脱水:轻度(失水 2%-3% 体重)口渴、尿量减少;中度(4%-5% 体重)口渴严重、皮肤干燥、头晕;重度(7%-14% 体重)狂躁、谵妄,15% 体重脱水致昏迷、休克。小儿可出现脱水热。
    • 等渗性脱水:主要表现为血容量不足相关症状,如心率加快、血压下降等。
  3. 诊断:结合病史初步判断类型,如高热多为高渗性,呕吐多为低渗或等渗性。实验室检查确诊,高渗性血钠 > 145mmol/L、尿比重高;低渗性血钠 < 130mmol/L、尿钠少;等渗性血钠正常、尿量少。
  4. 治疗
    • 原则:治疗原发病,监测出入量及电解质,重度脱水监测中心静脉压。
    • 补液总量:含已丢失量(按血钠、血细胞比容等公式计算)和继续丢失量(生理需量 1500ml/d + 病理丢失量)。
    • 速度与途径:先快后慢,重症 4-8h 补 1/3-1/2 总量,剩余 24-48h 补完,结合心肺肾功能调整。
    • 各类型方案:高渗性先补等渗盐水纠正循环,后补低渗盐水,血 Na⁺下降速度每小时≤0.5mmol/L;等渗性首选 0.9% 氯化钠液,长期用需调整配方防高氯性酸中毒;低渗性以高渗液为主,严重低钠(110-115mmol/L)补 3%-5% 氯化钠液,血 Na⁺升高速度每小时≤0.5mmol/L。

(三)水过多和水中毒

  1. 病因与机制:ADH 代偿性增多(如右心衰竭)、ADH 分泌失调综合征、肾水排泄障碍(如急性肾衰竭少尿期)、激素分泌不足、渗透阈重建、ADH 用量过多等致水潴留。
  2. 临床表现:急性起病急,有头痛、精神失常、颅内高压等;慢性轻度仅体重增加,血浆渗透压 < 260mmol/L 出现疲倦、肿胀,<240-250mmol/L 有神经症状,<230mmol/L 或血钠 48h 内 < 108mmol/L 致抽搐、昏迷或永久性损伤。
  3. 诊断:依病史、临床表现及实验室检查,尿钠 > 20mmol/L 可与缺钠性低钠血症鉴别,需判断病因、程度及心肺肾功能。
  4. 治疗:治疗原发病,记录出入量,控制饮水量。轻症限水并服利尿剂;急重症高容量综合征用袢利尿剂,必要时血液超滤;ADH 分泌过多者除病因治疗外用药;低渗血症伴神经症状者用 3%-5% 氯化钠液,同时输呋塞米,必要时血液净化。

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  1. CONNECT:[ UseTime:0.000500s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000560s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000268s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000453s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000481s ]
  8. SELECT * FROM `article` WHERE `id` = 462679 LIMIT 1 [ RunTime:0.000344s ]
  9. UPDATE `article` SET `lasttime` = 1775936807 WHERE `id` = 462679 [ RunTime:0.000924s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 462679 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000387s ]
  12. SELECT * FROM `article` WHERE `id` > 462679 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000355s ]
  13. SELECT * FROM `article` WHERE `id` < 462679 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001164s ]
  14. SELECT * FROM `article` WHERE `id` < 462679 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000844s ]
  15. SELECT * FROM `article` WHERE `id` < 462679 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001752s ]
0.115071s