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【考点整理+PPT】低钾血症与安全补钾

  • 2026-04-04 11:13:20
【考点整理+PPT】低钾血症与安全补钾

【考点整理】

一、钾代谢基础

1. 体内分布

  • 细胞内:约98%,浓度140150      mmol/L
  • 细胞外:约2%,浓度3.55.5      mmol/L(血钾反映此部分)
  • 临床意义:血钾正常体内不缺钾,补钾需持续监测

2. 生理功能

  • 维持静息膜电位与动作电位(神经传导、肌肉收缩)
  • 参与细胞代谢(多种酶的辅因子)
  • 调节细胞内渗透压与酸碱平衡(H-K交换)

3. 调节机制

类型

机制

临床相关点

快速调节

(细胞内外转移)

Na-K泵、胰岛素、β-激动剂、酸碱平衡

胰岛素+葡萄糖可快速降钾,易致医源性低钾

长期调节

(肾脏排泄)

醛固酮(保钠排钾)

排钾利尿剂、醛固酮增多症低钾

酸碱影响:酸中毒 → K出细胞(血钾);碱中毒 → K入细胞(血钾)。

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二、低钾血症的定义与分级

1、定义:血清钾< 3.5 mmol/L(诊断金标准,心电图仅辅助)

2、分级

分级

血钾(mmol/L

轻度

3.03.5

中度

2.53.0

重度

< 2.5

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三、病因(不吃、狂拉、利尿、碱中毒、打胰岛素

类别

具体原因

关键点

摄入不足

长期禁食、厌食、肠外营养不补钾

相对少见

丢失过多

消化道:呕吐、腹泻、胃肠减压

常见

肾脏:排钾利尿剂(呋塞米、HCTZ)、醛固酮增多症、肾小管性酸中毒

最重要/最常考

转移入胞

碱中毒、大量葡萄糖+胰岛素、周期性麻痹、急性肾衰竭多尿期

医源性常见

重要补充:低镁血症常与低钾并存,不纠正低镁则低钾难以纠正

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四、临床表现(四肢无力像瘫痪,腹胀心慌心电图变,TUQT

1. 神经肌肉(最早、最突出)

  • 肌无力(始于四肢,向上发展)→ 弛缓性瘫痪 → 呼吸肌麻痹;
  • 腱反射减弱或消失。

2. 消化系统

  • 厌食、恶心、呕吐、腹胀、肠麻痹。

3. 心血管系统(最危险)

  • 心律失常:室早、室速、室颤
  • 对洋地黄敏感性增高,易中毒
  • 心电图演变
    • 早期:T波低平/倒置,ST段压低
    • 典型:出现UQT间期延长(实为QU间期)
    • 严重:QRS增宽,P波增高

临床陷阱低钾症状可被脱水掩盖,脱水纠正后(血液稀释、尿钾排出增加)症状反而更明显。

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五、补钾指征(尤其高危人群)

根据《东湖共识》与《中国心衰离子管理共识》:

  • 1、任何低钾原因均需纠正(先排除假性低钾)。
  • 2、高危人群(心衰、心梗、缺血性心肌病、心律失常、使用洋地黄):
    • 即使无症状的轻度低钾也应治疗;
    • 目标血钾>       4.0 mmol/L。
  • 3、心衰患者:维持血钾4.05.0      mmol/L;即使血钾 3.54.0(正常低值)也应补钾,同时补镁。

人群

启动补钾阈值

目标血钾

高危

< 4.0 mmol/L

> 4.0

一般

< 3.5 mmol/L

3.55.0

六、补钾量计算

1、基础换算

  • 1 mmol KCl ≈      0.075 g
  • 1 g KCl ≈ 13.4      mmol
  • 成人每日生理需钾量:约 34 g K ≈ 67 g KCl

2、补钾公式(缺钾量,不含生理需要)

缺钾量(mmol=(目标血钾 - 实测血钾)× 体重(kg) × 分布系数(0.30.4

  • 目标血钾:常用4.5      mmol/L
  • 分布系数:0.3(细胞外液)~0.4(经验值)

3、示例:患者血钾3.0 mmol/L,体重 60 kg

  • 缺钾量 = (4.5 - 3.0) × 60      × 0.3 = 27 mmol
  •  KCl = 27 ÷ 13.4      ≈ 2 g
  • 加上生理需要量 67 g → 当日共需89 g KCl

4、简化分级补钾(参考共识,不含每日生理量)

低钾程度

需补 KClg

轻度

34

中度

46

重度

69

---

七、安全补钾的五大原则(见尿、低浓度、慢速度、选对溶媒、口服优先

① 见尿补钾

  • 尿量 > 500 mL/d  > 40 mL/h
  • 除非严重心律紊乱或呼吸肌麻痹等紧急情况

② 低浓度

  • 外周静脉:钾浓度≤      40 mmol/L ≈ 氯化钾≤ 3 g/L(即1000 mL液体最多加3 g
  • 中心静脉可稍高,但需监护

③ 慢速度

  • 外周静脉:1020 mmol/h(高危者从10 mmol/h开始)
  • 周期性低钾麻痹 ≤10 mmol/h
  • 严禁静脉推注!

④ 选对溶媒

  • 初始治疗:优先用0.9% 生理盐水(避免葡萄糖刺激胰岛素释放,促钾内移)
  • 血钾正常后:可改用葡萄糖液+KCl(预防高钾)

⑤ 尽量口服

  • 10% KCl 注射液口服(优于缓释片,后者吸收慢、局部损伤)
  • 两次给药间隔 ≥3060 min

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八、特殊情况与处理

情况

处理

合并低镁

先补镁(门冬氨酸钾镁),否则低钾难纠正

肝功能衰竭轻中度低钾

可用谷氨酸钾(但含钾低,不做首选)

肾小管酸中毒

用枸橼酸钾,注意肝功能

伴高血压/水肿

可联用保钾利尿剂(螺内酯、氨苯蝶啶等)

外周静脉疼痛

优先降低浓度(如从3g/L降至1.5g/L→ 无效则减慢速度 → 仍无效用中心静脉

危及生命(瘫痪、恶性心律失常)

严密监护下经中心静脉更高浓度/速度补钾

伴休克

先恢复血容量,尿量达标后再补钾

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九、补钾期间监测要求

1、血钾监测频率

  • 重度低钾(<2.5)或血钾波动 ≥0.5 mmol/L1小时测一次;
  • 血钾升至 ≥3.02小时测一次;
  • 停止补钾后复查一次。

2、心电监护指征

  • 补钾速度 >10 mmol/h(约每小时补KCl 0.75 g)时需持续心电监护。

3、其他监测

  • 同时监测血镁、血pH值;
  • 补钾后血钾上升是暂时的,大部分K进入细胞内池,需持续补充直至完全纠正。

---

十、常见临床陷阱与记忆口诀

1、常考陷阱

  • 伴休克者,先扩容再补钾
  • 补钾后血钾不升或上升慢 → 细胞内缺钾更严重,需持续补充
  • 不要单凭心电图诊断低钾血症(以血钾为准)
  • 忽视低镁 → 低钾难纠正
  • 使用葡萄糖+胰岛素降钾时未同步补钾
  • 外周静脉疼痛时只调速度不调浓度(应优先降低浓度)
  • 在血容量不足、尿量未达标时盲目补钾

2、记忆口诀

  • 病因口诀:不吃、狂拉、利尿、碱中毒、打胰岛素

  • 临床表现口诀:四肢无力像瘫痪,腹胀心慌心电图变,TUQT

  • 安全补钾口诀:见尿补钾浓度低,速度不超二十滴;溶媒首选生理盐,静推一条是禁忌。

十一、核心总结

  1. 低钾血症(血钾<3.5)是常见且危险的电解质紊乱
  2. 高危人群(心衰、心律失常、使用洋地黄等)需更积极干预,目标血钾>4.0
  3. 安全补钾五大原则:见尿、低浓度、慢速度、选对溶媒、口服优先
  4. 补钾公式可估算缺钾量,但需动态评估
  5. 监测血钾、血镁、心电监护至关重要
  6. 严禁静脉推注!

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参考文献

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  1. CONNECT:[ UseTime:0.000741s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000923s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000540s ]
  8. SELECT * FROM `article` WHERE `id` = 495400 LIMIT 1 [ RunTime:0.001116s ]
  9. UPDATE `article` SET `lasttime` = 1775310108 WHERE `id` = 495400 [ RunTime:0.002069s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000335s ]
  11. SELECT * FROM `article` WHERE `id` < 495400 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000523s ]
  12. SELECT * FROM `article` WHERE `id` > 495400 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000621s ]
  13. SELECT * FROM `article` WHERE `id` < 495400 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004048s ]
  14. SELECT * FROM `article` WHERE `id` < 495400 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003027s ]
  15. SELECT * FROM `article` WHERE `id` < 495400 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002603s ]
0.089703s