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心电学习笔记(231)如何秒杀房颤伴预激

  • 2026-02-06 16:58:08
心电学习笔记(231)如何秒杀房颤伴预激
第一次听说这个名词,是好几年前医院年末考三基的时候遇到的一份图,师兄说QRS波宽大畸形,且RR间期绝对不齐,首先就要考虑房颤伴预激,听得我一愣一愣的,后来才发现师兄说的真是精辟!可惜当时不能拿手机拍图所以没留底。
对,没错,当遇到一份图,如果同时满足QRS波宽大畸形+RR间期绝对不等,首先就要考虑房颤伴预激。
例如这一些:
图1与图2均来自同行老师供图。
上述两图均符合①QRS波宽大畸形+②RR间期绝对不齐,这两个特点,所以我个人的考虑是房颤伴预激。
QRS波的宽大畸形,可以用预激时QRS波起始部宽顿,且QRS波轻度增宽,可继发引起ST-T改变。而RR间期绝对不齐,就属于房颤的特点。
在书本上,房颤伴有预激主要分为三种类型:
①房室旁道前传优势型,顾名思义,就是心房的冲动完全/大部分由旁道下传心室,特点为QRS波宽大畸形,呈完全预激型。且由于旁道的下传速度快(相对于房室结而言),故该类型的心室率会比较快,常>200次/分,可达300次/分。
平均RR间期、平均心室率、最短RR间期为预测高危患者的重要指标,当平均RR间期短于0.25s或最短RR间期≤0.18s时,容易演变为心室颤动而猝死。
所以,当房颤伴预激,最短RR间期<250ms(0.25s)时,需要报危急值。
返回看图1与图2,QRS波宽大畸形,属于显性预激,应当为房室旁道前传优势型。且V1-V2导联R波/预激波向上,属于A型预激,推测房室旁道位于左侧。
这种QRS波宽大畸形的,而且心室率比较快的图,很容易与室速混淆。但是室速一般RR间期比较整齐
②房室正道前传优势型:见于隐匿性预激综合征或间歇性预激综合征患者,f波主要由房室传下传,偶有经旁道下传,心室率快而不规则,多>100次/分。QRS波群多正常,偶见部分或完全性预激图形。
这种类型的话,如果同一份图中不是偶见部分或完全性预激图形,是无法确定存在预激的。
③中间型:见于上述两者之间,f波可经由房室结、旁道下传,心室率快而不规则,150-200次/分之间,可见完全性/部分预激及正常QRS波群。该型在高度紧张/惊恐、交感神经兴奋或使用洋地黄等药物时,可恶化成第房室旁道前传优势型,并演变成室颤而猝死。
所以,写了那么多,其实就是第①种房室旁道前传优势型比较危险,而第③种呢,需要提醒我们医生用药需谨慎。
治疗:药物可用普罗帕酮、伊布利特。如果心室率极快,最短RR间期<180ms,或药物治疗效果不佳时,可选用低能量电复律治疗旁道射频消融术是治疗房颤合并预激的有效手段。
小结:房颤合并预激:不少见,①心电图特点为QRS波宽大畸形+RR间期绝对不齐,也就是同时拥有预激与房颤的特点;②当心室率极快,最短RR间期<250ms时需要报危急值,容易恶化成心室颤动而猝死;③临床用药需谨慎,不可使用洋地黄,首选普罗帕酮。
最后来看一道竞赛题,贼爱出这种类型的题目:秒杀武器就是QRS波宽大畸形+RR间期绝对不等。
图源自网络,侵权请联系删除。
答案当然就是极速型心房颤动伴心室预激。这个最短RR间期<1格(200ms),所以该图需紧急处理。

以上仅代表个人目前的意见,欢迎各位老师留言纠错、赐教、讨论。

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  1. CONNECT:[ UseTime:0.001296s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001841s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000732s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003368s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001540s ]
  6. SELECT * FROM `set` [ RunTime:0.008432s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001740s ]
  8. SELECT * FROM `article` WHERE `id` = 464084 LIMIT 1 [ RunTime:0.011886s ]
  9. UPDATE `article` SET `lasttime` = 1770426786 WHERE `id` = 464084 [ RunTime:0.004260s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.005020s ]
  11. SELECT * FROM `article` WHERE `id` < 464084 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002019s ]
  12. SELECT * FROM `article` WHERE `id` > 464084 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.022637s ]
  13. SELECT * FROM `article` WHERE `id` < 464084 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.024658s ]
  14. SELECT * FROM `article` WHERE `id` < 464084 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.030415s ]
  15. SELECT * FROM `article` WHERE `id` < 464084 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.021513s ]
0.312074s