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学习笔记:二度房室传导阻滞的分型机制和特殊类型

  • 2026-02-22 10:56:08
学习笔记:二度房室传导阻滞的分型机制和特殊类型
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心电知识点系列
二度房室阻滞
好好学习,天天向上

二度房室阻滞指的是心房激动部分未能下传至心室,导致P波后QRS波群脱落的心律失常。根据房室传导文氏现象的存在与否,常被分为二度I型与二度II型。由于两种类型在电生理机制和临床意义上的差别,导致在做临床干预时,原则和方法上上是有一定区别的。

一、分型与心电图特征

二度房室阻滞的诊断与分类依赖于对PR间期规律的测量判断

1.二度I型房室阻滞(莫氏I型,文氏型)

心电图特征:

•PR间期进行性延长,直至一个P波后QRS波群脱落,形成一个长RR间期。

脱落后的第一个PR间期恢复至最短,上述模式周而复始(文氏周期)。

•总体上呈现RR间期呈现“进行性缩短后突然延长”的特点,且长RR间期短于任何两个短RR间期之和。

2.二度II型房室阻滞(莫氏II型)

心电图特征:

•所有能够下传的P波,其PR间期恒定不变(可正常或延长)

•QRS波群突然、不可预测地脱落,脱落前后的PR间期无变化。

常伴宽QRS波群(束支阻滞图形)。

当房室传导比例固定为2:1时,称为二度2:1房室传导,无法根据单次PR间期变化进行分型。

二、电生理机制

两类阻滞的电生理机制

1、二度I型阻滞

主要机制是房室传导组织的相对不应期病理性延长。每次成功下传的冲动均落入前次冲动后的相对不应期,导致传导速度(PR间期)逐次递减;最终,冲动落入有效不应期而发生传导阻滞。阻滞后的长间歇使组织得以充分恢复,传导性改善(表现为Pr间期缩短)。

2、二度II型阻滞

主要机制是希浦系统有效不应期的绝对延长。其相对不应期无明显异常,激动在兴奋期内传导速度恒定(PR间期固定)。当冲动落入异常延长的有效不应期时,就发生了“全或无”式的传导中断(要么传导中断,要么正常传导)。

三、 特殊类型的二度阻滞

1、2:1房室传导

I型或II型的特殊表现。通常情况下窄QRS波群多提示为I型变异,宽QRS波群则提示为II型;可以通过改变窦性频率(活动、阿托品试验)诱发3:2传导,暴露PR间期变化规律来区别。

2、不典型传导与“未遂型”二度

临床常常可以看到不典型文氏周期或PR间期不规则延长。所说的“未遂型”不是标准规范术语,可理解为介于一度与二度阻滞之间的状态,例如:PR间期明显的波动性延长,但没有脱落(印象里见过这样的图,但翻历史记录没找到图,典型表现是前期表现非常符合文氏传导的特点,在预期的会有P波脱落的地方,嘿,你猜怎么着,不但没脱落,反而PR间期恢复了正常,强迫症受不了。不知老师们见没见过这样的图,不妨评论区聊聊);或在心房率增快时出现才PR间期递增直至脱落,说明传导功能处于失代偿边缘。动态心电图监测对这种特殊的二度阻滞发现概率较高。

图中P1R P2R P3R间期逐渐延长,符合文氏传导的表现,但一个未预期的房早未下传破坏了正常的文氏周期,形成了不典型的二度I型房室阻滞。

四、临床意义

1、二度I型:常见于迷走神经张力增高、运动员、药物影响(如地高辛、β受体阻滞剂)、急性下壁心肌梗死或心肌炎。多数情况下“预后良好”,进展为完全性房室阻滞的风险较低。

2、二度II型:几乎均为器质性病变所导致,比如原发性传导系统退行性变、前壁心肌梗死、心肌病等,有较高风险进展为症状性心动过缓或完全性心脏阻滞,有一定风险导致晕厥或猝死。

对于心电图医师来说,能准确识别二度房室阻滞的类型才能进一步估患者风险的。面对2:1或等不典型情况,需结合更多信息进行综合判断,最终目的是实现个体化的患者治疗和管理。

文章合集:
心电知识点系列
健康科普系列
病例分享
报告解读系列
心电图检查系列
入职体检系列
职称考试系列
心电知识点视频讲解

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  1. CONNECT:[ UseTime:0.000932s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001301s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000641s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000558s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001209s ]
  6. SELECT * FROM `set` [ RunTime:0.000474s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001179s ]
  8. SELECT * FROM `article` WHERE `id` = 469332 LIMIT 1 [ RunTime:0.000767s ]
  9. UPDATE `article` SET `lasttime` = 1771778353 WHERE `id` = 469332 [ RunTime:0.012279s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000576s ]
  11. SELECT * FROM `article` WHERE `id` < 469332 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001037s ]
  12. SELECT * FROM `article` WHERE `id` > 469332 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000830s ]
  13. SELECT * FROM `article` WHERE `id` < 469332 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006273s ]
  14. SELECT * FROM `article` WHERE `id` < 469332 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002355s ]
  15. SELECT * FROM `article` WHERE `id` < 469332 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004978s ]
0.203660s