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八仙聊起搏—试题解析(一百零九期):百多力双腔起搏器单心室电极植入情况下的安全AV延迟功能运作

八仙聊起搏—试题解析(一百零九期):百多力双腔起搏器单心室电极植入情况下的安全AV延迟功能运作
试题109患者女性,76岁,因发现单腔起搏器电池耗竭3天收治住院,住院期间行起搏器脉冲发生器更换术,术中未植入或更换新的电极导线。器械品牌为德国百多力,型号Enticos 4 DR。术后1天行动态心电图检查,截取片段图(片段图为连续记录)。请问该起搏心电图的诊断,以下说法正确的是:(多项选择题)

A.VVIR起搏模式

B.DDD起搏模式

C.间歇性心室感知功能不足

D.心室夺获控制功能

E.安全AV延迟功能

F.频率滞后功能

试题解析:

动态心电图分析,根据题干提供的信息,患者因单心室起搏器电池耗竭后更换为双腔起搏器(德国百多力,型号Enticos 4 DR),但并未植入新的电极导线。此时起搏器的工作方式可能是VVIRDDD。第一步用VVIR工作方式进行分析。图1-AR1R2R2R3R10R11R12R13R13R14呈心室起搏节律,起搏频率为60/分,考虑为低限频率计时触发心室起搏(VP)R4R10R11QRS波终末,红色箭头标记处见起搏脉冲信号发放,R3R4起搏计时间期为920msR9R10起搏计时间期为1100msR11R12起搏计时间期为1080ms。分析起搏频率变化的原因有两种可能:一是开启频率应答功能(VVIR),传感器运行时起搏频率为逐渐发生变化,此功能不符合。二是心室夺获控制功能开启时运作融合波排除,此功能运作时见心室起搏备用脉冲发放,以及起搏频率滞后10/分进行融合波确认,但图中并无此规律,此功能亦不符合。动态心电图片段分析总结,起搏工作方式表现为心室起搏;但是起搏计时间期不符合单腔起搏器计时算法。

第二步用DDD起搏工作方式进行分析,题干中给出患者并未植入新的起搏电极,可推测未植入心房电极导线。百多力双腔起搏器默认设置为DDD模式,起搏计时为纯心房计时发放心房起搏脉冲(AP)。因心房腔内无电极导线,故AP不能有效起搏心房,心电图不能记录到AP,同时心房无感知功能,不能触发心室起搏。因此可以简单的将此图视作心房起搏功能不良、心房感知功能不足且看不到心房脉冲的心电图来分析。双腔起搏器,VP由心房事件触发,图1-AR1R2R2R3起搏频率为60/分,VP脉冲前应存在APR4VP脉冲的提前,考虑为PAV缩短造成,因心房无感知功能,排除动态AV功能运行。图中R4为窦性下传的QRS波,因此推测起搏房室间期(PAV)缩短是安全AV延迟功能运行。百多力的安全AV延迟功能运作时,PAV缩短至100ms,假设在R4VP100ms处画一个“隐形”的AP脉冲(如图中绿色竖线所示),则窦性下传的QRS波落入AP后的安全窗口内触发VP。以R4AP脉冲为起点往前1000ms画出R3R2R1AP脉冲,可得出PAV间期为180ms,因此假设是合理的。另从R4AP往后测量1000msR5窦性下传QRS波落在这个计时间期内,自身P波因心房内无电极导线而不能被感知,因此被视作室性早搏(PVC)并抑制AP脉冲发放。百多力计时间期为纯心房计时,VA间期=AA间期,图中R6R9均被视作PVC,抑制了AP的发放。R10R11QRS位于AP后安全窗口,触发安全AV延迟功能运作。R11R12起搏脉冲的计时间期为1080ms,原因是基于A-A计时的算法;R11PAV100msR12PAV180ms,导致V-V间期略有延长。

查询患者手术资料示植入单心室电极导线,脉冲发生器为双腔起搏器,心房插孔封堵状态。给予起搏器程控询问示:DDD起搏模式,低限频率为60/分,PAV180140ms,感知房室间期(SAV)为13595ms。图2A程控腔内图标记通道示DDD起搏工作方式。其中R1R2体表导联示心室起搏节律;标记通道示AP-VP工作序列,计时间期为1000msPAV180msR3VP起搏脉冲落于QRS波起始处,呈伪室性融合波。R4示心房起搏脉冲按A-A计时周期发放,窦性下传的QRS波落在AP后安全窗口内,触发安全AV延迟功能,PAV100msR5R6R7示起搏器标记为PVC(室性早搏),R8AP-VP工作序列,R7PVC-AP的计时周期为1000msVA=AA计时。图2B程控腔内图示R2为窦性搏动,体表心电图未见任何起搏脉冲信号的发放,但是标记通道显示为AP-VS工作序列。结合程控检查,动态心电图的起搏心电图诊断为DDD起搏工作方式;部分见安全AV延迟功能运行。该患者最终程控调整工作参数至VVI起搏模式。

答案: BE

参考文献

1.吉亚军,陈顾江,杨亚莉,.心脏起搏器现代功能详解(第2版)[M].北京:北京大学医学出版社,2024.

2.牟延光.心脏起搏心电图学[M].济南:山东科学技术出版社,2024.

解析老师黄玥  孙娴超嘉兴大学附属医院嘉兴市第一医院
审核老师:陈  妍 海宁市人民医院
                  朱明芳 宁国市人民医院
这期试题分享有很多老师参与了答题和留言,以下截取了几位优秀老师的答题,感谢各位老师们的关注和留言:
编辑:吴建敏  温州医科大学附属第二医院 
签发:吉亚军  海宁市人民医院

End

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  1. CONNECT:[ UseTime:0.000563s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000742s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004276s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.028585s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000933s ]
  6. SELECT * FROM `set` [ RunTime:0.000264s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000678s ]
  8. SELECT * FROM `article` WHERE `id` = 871327 LIMIT 1 [ RunTime:0.000605s ]
  9. UPDATE `article` SET `lasttime` = 1784745972 WHERE `id` = 871327 [ RunTime:0.021233s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.004393s ]
  11. SELECT * FROM `article` WHERE `id` < 871327 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000710s ]
  12. SELECT * FROM `article` WHERE `id` > 871327 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000487s ]
  13. SELECT * FROM `article` WHERE `id` < 871327 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001337s ]
  14. SELECT * FROM `article` WHERE `id` < 871327 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006625s ]
  15. SELECT * FROM `article` WHERE `id` < 871327 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001262s ]
0.164445s