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【346】急性高钾血症的临床处理.ppt

  • 2026-04-06 21:16:10
【346】急性高钾血症的临床处理.ppt

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先看看我写的学习笔记,PPT往下翻。

急性高钾血症是危及生命的电解质紊乱,核心救治原则为 “先保心、再转钾、后排钾、勤监测、防复发”,需按严重程度分层干预,及时处理可显著降低死亡率。


一、概述与诊断

(一)核心定义与危害

  • 定义:血清钾短时间内升高>5.0 mmol/L,可为首次发作或慢性高钾血症急性加重。
  • 高发人群:心力衰竭、肾功能不全、使用保钾药物者。
  • 危害:早期表现为乏力、恶心、心动过缓,严重时引发心律失常、心脏骤停。

(二)诊断与分级

  1. 诊断依据:血清钾检测(核心指标)+ 病史(钾摄入、肾脏病史、用药史)+ 临床表现 + 心电图特征。
  2. 严重程度分级:
    • 轻度:血钾 5.0~5.9 mmol/L,无心电图特征性改变。
    • 中度:血钾 6.0~6.4 mmol/L(无论心电图),或 5.0~5.9 mmol/L 合并心电图改变。
    • 重度:血钾≥6.5 mmol/L(无论心电图),或 6.0~6.4 mmol/L 合并心电图改变。

二、对心脏的影响与心电图表现

(一)影响机制

  • 干扰心肌电生理活动,导致传导异常、心律失常,严重时引发窦室传导、室颤甚至猝死。
  • 注意:心电图演变与血钾浓度不完全平行,部分患者可无先兆直接猝死。

(二)心电图特征

  • 血钾 5.5~6.5 mmol/L:对称性高尖 T 波。
  • 血钾 6.5~8.0 mmol/L:PR 间期延长、QT 间期缩短、扁平 P 波、QRS 波宽大。
  • 血钾>8.0 mmol/L:P 波消失、传导阻滞、QRS 波进行性增宽、窦室传导、室颤。

三、急诊处理 “5 步法”

(一)Step 1:保护心脏(稳定心肌细胞膜)

  • 目标:预防恶性心律失常。
  • 措施:心电监护下给予钙剂,10% 葡萄糖酸钙 10ml 稀释后缓慢静推(作用持续 60 分钟,可重复);中心静脉置管者可用 10% 氯化钙 5~10ml 经中心静脉给药。

(二)Step 2:转移钾离子进入细胞

  • 目标:快速降低细胞外钾浓度,暂缓解毒性。
  • 方案:
    • 胰岛素 + 葡萄糖:胰岛素 10U+50% 葡萄糖 50ml 静推(血糖>13.9mmol/L 时单用胰岛素),20 分钟起效,持续 4~6 小时。
    • 碳酸氢钠:150~250ml 缓慢静滴,仅用于合并严重代谢性酸中毒的心力衰竭患者,效果持续约 2 小时。

(三)Step 3:促进钾离子排出(减少总钾负荷)

  • 措施:
    • 排钾利尿剂:袢利尿剂(呋塞米、托拉塞米)效果优于噻嗪类,静脉给药更佳,需肾功能良好、无血容量不足。
    • 离子交换树脂:聚苯乙烯磺酸钠、聚苯乙烯磺酸钙(口服起效慢,易致电解质紊乱)。
    • 新型钾离子结合剂:环硅酸锆钠、Patiromer。
    • 血液净化:血液透析(高效降钾,适用于血钾>6mmol/L 或药物无效者)、CRRT(血流动力学不稳定者)、腹膜透析(血管通路建立困难者)。

(四)Step 4:监测

  • 定期复查血清钾,动态评估疗效;胰岛素治疗后 6 小时内监测血糖(防低血糖);持续心电监护,观察心律失常变化。

(五)Step 5:预防复发

  • 去除诱因(停用保钾药物、控制钾摄入);治疗基础疾病(改善肾功能);高危人群定期监测血钾。

四、特殊人群处理要点

(一)心力衰竭患者

  • 避免使用 β2 - 肾上腺素能受体激动剂;碳酸氢钠仅用于合并严重代谢性酸中毒者;优先选 CRRT(血流动力学不稳定)或血液透析(水负荷过重)。

(二)肾功能不全患者

  • 首选血液净化治疗(透析依赖者);利尿剂疗效不佳,避免盲目使用;长期预防可选用新型钾离子结合剂。

(三)老年患者

  • 按肾功能调整用药剂量,加强监测,避免电解质紊乱加重。

核心总结

急性高钾血症救治需快速分层干预,“保护心脏” 是首要步骤,后续通过转钾、排钾从根源纠正,全程监测与复发预防不可或缺。临床需结合患者基础疾病(如心衰、肾衰)选择适宜方案,严格遵循指南用药,避免不良反应。

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  1. CONNECT:[ UseTime:0.000933s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001474s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000687s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000792s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001595s ]
  6. SELECT * FROM `set` [ RunTime:0.000618s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001427s ]
  8. SELECT * FROM `article` WHERE `id` = 490278 LIMIT 1 [ RunTime:0.001096s ]
  9. UPDATE `article` SET `lasttime` = 1775917023 WHERE `id` = 490278 [ RunTime:0.001290s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000849s ]
  11. SELECT * FROM `article` WHERE `id` < 490278 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001163s ]
  12. SELECT * FROM `article` WHERE `id` > 490278 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001264s ]
  13. SELECT * FROM `article` WHERE `id` < 490278 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001881s ]
  14. SELECT * FROM `article` WHERE `id` < 490278 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002026s ]
  15. SELECT * FROM `article` WHERE `id` < 490278 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002057s ]
0.193877s