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【184】钙代谢紊乱.ppt

  • 2026-05-31 06:33:52
【184】钙代谢紊乱.ppt

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PPT页数:16页
先看看我写的学习笔记,PPT往下翻。

一、钙的正常代谢

(一)钙的吸收及代谢

  1. 含量与来源:钙是人体内含量最丰富的无机元素,正常成人体内钙总量 700-1400g,主要通过食物供给,常见来源为牛奶、乳制品、蔬菜、水果。
  2. 吸收条件与机制:食物中的钙需转化为游离钙(Ca²⁺)才能被吸收;肠管 pH 偏碱时 Ca²⁺吸收减少,偏酸时吸收增多;吸收部位集中在小肠,吸收率约 30%;Ca²⁺通过被动扩散或易化转运进入黏膜细胞,此过程需 Ca²⁺结合蛋白(CaBP)作为转运载体。
  3. 排泄途径:约 20% 的钙经肾脏排出,80% 随粪便排出;肾小球滤过的钙中,95% 以上会被肾小管重吸收,且血钙水平升高时,尿钙排出量会相应增多。
  4. 分布情况:约 99% 的钙和 86% 的磷以羟磷灰石形式存在于骨骼和牙齿中,剩余部分分布在体液与软组织内。
  5. 血钙相关:血钙指血清总钙量,正常成人范围为 2.25-2.75mmol/L,儿童血钙水平略高;发挥生理作用的关键是游离 Ca²⁺,血液偏酸时游离 Ca²⁺浓度升高,偏碱时降低,碱中毒引发的抽搐症状,与血浆游离钙降低密切相关。

(二)体内外钙稳态调节

体内钙磷代谢的稳定由甲状旁腺激素(PTH)、1,25-(OH)₂D₃和降钙素三种激素共同调控,三者作用于肾脏、骨骼、小肠三个靶器官,通过相互制约、协同作用,维持血钙浓度的相对恒定。

(三)钙的其他生理功能

  1. 调节细胞功能的信使:细胞外 Ca²⁺是重要的第一信使,可通过细胞膜上的钙通道或钙敏感受体(CaSR)发挥调节作用;细胞内 Ca²⁺作为第二信使,参与肌肉收缩、激素及神经递质分泌、体温调节等生理过程;此外,CaSR 还能维持钙及其他金属离子稳态,调节细胞分化、增殖与凋亡。
  2. 调节酶的活性:线粒体内的钙离子可参与调节 “氧化磷酸化向糖酵解转变” 的过程(即 Warburg 效应),进而促进肿瘤细胞增殖,具体机制与低水平线粒体钙离子诱导丙酮酸脱氢酶磷酸酶活性有关。
  3. 维持神经 - 肌肉的兴奋性:钙与 Mg²⁺、Na⁺、K⁺等共同维持神经 - 肌肉的正常兴奋性,当血浆 Ca²⁺浓度降低时,神经 - 肌肉兴奋性会升高,可能引发抽搐。
  4. 其他功能:Ca²⁺可降低毛细血管和细胞膜的通透性,减少渗出,同时起到抑制炎症与水肿的作用。

二、钙代谢紊乱的分类

(一)低钙血症

  1. 定义:在血清蛋白浓度正常的前提下,血钙低于 2.25mmol/L,或血清 Ca²⁺浓度低于 1mmol/L,即可诊断为低钙血症。
  2. 病因:常见诱因包括维生素 D 缺乏、甲状旁腺功能减退、慢性肾衰竭、慢性腹泻、小肠吸收不良综合征;需注意,急性出血性坏死性胰腺炎患者中,血清 Ca²⁺浓度低下是判断预后不良的重要指标。
  3. 临床表现:主要症状有出血、局部水肿、软弱无力,严重时可出现四肢抽搐。
  4. 治疗措施:出现抽搐时,需立即静脉注射 1-2g 葡萄糖酸钙;若抽搐症状未得到控制,可肌内注射 1-2g 硫酸镁,或将其加入 5% 葡萄糖溶液中静脉滴注;同时,需针对具体病因开展对应治疗。

(二)高钙血症

  1. 定义与类型:血清蛋白浓度正常时,血钙>2.75mmol/L,或血清 Ca²⁺浓度超过 1.25mmol/L,即为高钙血症。临床分为两类,一是调节血 - 骨平衡引起的平衡性高血钙,二是骨快速吸收导致的失平衡性高血钙。
  2. 病因:常见致病因素包括恶性肿瘤(尤其是乳腺癌)、甲状旁腺功能亢进、维生素 D 和维生素 A 摄入过多、转移性骨癌、多发性骨髓瘤,少数情况下由性激素或噻嗪类利尿剂引发。
  3. 临床表现:早期症状有食欲减退、恶心、口渴、倦怠、便秘、尿频;若高血钙状态持续时间较长,可能引发血管钙化、肾钙化、肾结石,严重时导致肾功能不全。
  4. 治疗手段:以去除病因为核心治疗原则;促进尿钙排泄可通过静脉输入 0.9% 氯化钠与呋塞米,或采用透析方式降低血钙;减少钙从骨骼向细胞外液转移,常用肾上腺皮质类固醇(如泼尼松 80mg/d,或氢化可的松 300-400mg/d);增加钙从细胞外液向骨骼转移,可使用磷酸盐,静脉用量为 50mmol/L(1.5g),需在 6-8 小时内滴完,每日 1 次,肾功能不佳者每日用量不超过 1.0g。

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  1. CONNECT:[ UseTime:0.000507s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000677s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004039s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000347s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000657s ]
  6. SELECT * FROM `set` [ RunTime:0.000289s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000793s ]
  8. SELECT * FROM `article` WHERE `id` = 524237 LIMIT 1 [ RunTime:0.000419s ]
  9. UPDATE `article` SET `lasttime` = 1780300087 WHERE `id` = 524237 [ RunTime:0.001456s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000458s ]
  11. SELECT * FROM `article` WHERE `id` < 524237 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001519s ]
  12. SELECT * FROM `article` WHERE `id` > 524237 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015107s ]
  13. SELECT * FROM `article` WHERE `id` < 524237 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000804s ]
  14. SELECT * FROM `article` WHERE `id` < 524237 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011130s ]
  15. SELECT * FROM `article` WHERE `id` < 524237 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000871s ]
0.111107s