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【32】心电图-电解质紊乱和药物影响.ppt

  • 2026-04-13 13:09:05
【32】心电图-电解质紊乱和药物影响.ppt

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先看看我写的学习笔记,PPT往下翻。

一、电解质紊乱

(一)概述

  1. 定义:血清电解质浓度升高或降低。
  2. 核心影响:干扰心肌除极、复极及激动传导,心电图可出现相应改变。
  3. 重要提示:心电图改变与血清电解质水平不完全一致;多种紊乱并存可能相互影响;诊断需结合病史与临床表现。

(二)高血钾(hyperkalemia)

  1. 心电图改变(按血钾浓度递增):
    • 血钾>5.5mmol/L:QT 间期缩短,T 波高尖、基底部变窄。
    • 血钾>6.5mmol/L:QRS 波群增宽,PR 间期延长,QT 间期延长,R 波电压降、S 波加深,ST 段压低。
    • 血钾>7mmol/L:QRS 波群、PR 间期、QT 间期进一步延长;P 波增宽、振幅降低,甚至消失(窦室传导)。
  2. 严重后果:QRS 波与 T 波融合呈正弦波,引发室速、室扑、室颤,甚至心脏停搏。
  3. 案例:患者血钾 8.5mmol/L,符合上述高血钾心电图特征。

(三)低血钾(hypokalemia)

  1. 典型心电图改变:ST 段压低,T 波低平 / 倒置,u 波增高(u 波>0.1mV、u/T>1 或 T-u 融合、双峰);QT 间期正常或轻度延长(表现为 QT-u 间期延长)。
  2. 额外改变与心律失常:
    • 明显低血钾:QRS 波群时间延长,P 波振幅增高。
    • 可能引发:房速、室性异位搏动、室速、室内传导阻滞、房室传导阻滞。
  3. 案例:患者血钾 2.1mmol/L,可见 u 波,QT-u 间期 0.70 秒。

(四)高血钙与低血钙

  1. 高血钙:
    • 心电图改变:ST 段缩短 / 消失,QT 间期缩短。
    • 严重情况:快速静脉补钙时,可能出现窦性停搏、窦房传导阻滞、室性期前收缩、阵发性室速。
    • 案例:患者血钙 3.8mmol/L,QT 间期 0.30 秒。
  2. 低血钙:
    • 心电图改变:ST 段明显延长,QT 间期延长,直立 T 波变窄、低平 / 倒置。
    • 心律失常情况:极少发生。
    • 案例:患者血钙 1.46mmol/L,QT 间期 0.46 秒。

二、药物影响

(一)洋地黄

  1. 洋地黄效应(digitalis effect):
    • 作用机制:缩短心室肌动作电位 2 位相(甚至消失),减少 3 位相坡度,缩短动作电位时程。
    • 心电图特征:ST 段下垂型压低;T 波低平 / 双向 / 倒置(双向 T 波呈 “初始倒置、终末直立变窄”,ST-T 呈 “鱼钩型”);QT 间期缩短。
    • 临床意义:提示患者已接受洋地黄治疗。
  2. 洋地黄中毒(digitalis toxicity):
    • 症状特点:伴胃肠道、神经系统症状,核心表现为心律失常。
    • 常见心律失常:频发性 / 多源性室性期前收缩(二联律 / 三联律),严重时室速(尤其双向性)、室颤;交界性心动过速伴房室脱节;房速伴不同比例房室传导阻滞;二度 / 三度房室传导阻滞(严重中毒);窦性停搏、窦房传导阻滞、房颤、房扑。

(二)奎尼丁(ⅠA 类抗心律失常药)

  1. 治疗剂量表现:QT 间期延长;T 波低平 / 倒置;U 波增高;P 波稍宽(有切迹),PR 间期稍延长。
  2. 中毒剂量表现:QT 间期明显延长;QRS 时间明显延长(超原 25% 需警惕,达 50% 立即停药);各类房室传导阻滞、窦性心动过缓、窦性停搏 / 窦房传导阻滞;室性心律失常(严重时尖端扭转型室速、室颤),可致晕厥、猝死。

(三)其他药物

  1. 涉及药物:胺碘酮、索他洛尔等。
  2. 心电图改变:QT 间期延长。

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          1. CONNECT:[ UseTime:0.000596s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
          2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000679s ]
          3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
          4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000327s ]
          5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000521s ]
          6. SELECT * FROM `set` [ RunTime:0.000262s ]
          7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000591s ]
          8. SELECT * FROM `article` WHERE `id` = 488288 LIMIT 1 [ RunTime:0.000437s ]
          9. UPDATE `article` SET `lasttime` = 1776546687 WHERE `id` = 488288 [ RunTime:0.001388s ]
          10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000251s ]
          11. SELECT * FROM `article` WHERE `id` < 488288 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000411s ]
          12. SELECT * FROM `article` WHERE `id` > 488288 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000426s ]
          13. SELECT * FROM `article` WHERE `id` < 488288 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000980s ]
          14. SELECT * FROM `article` WHERE `id` < 488288 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001156s ]
          15. SELECT * FROM `article` WHERE `id` < 488288 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001021s ]
          0.081220s