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八仙聊起搏—试题解析(一百一十期):雅培起搏器心房起搏不良,间歇性心室过感知,AC功能运作

八仙聊起搏—试题解析(一百一十期):雅培起搏器心房起搏不良,间歇性心室过感知,AC功能运作
试题110患者,女,84岁,植入双腔起搏器,低限频率60/分,PAV间期350ms。下图为动态心电图片段:

1、请根据此片段判断起搏器品牌:

A:美敦力

B:雅培

C:百多力

D:波科

2、请写出上图心电图诊断:

试题解析:(1)

1、图中可见心房脉冲后未能产生相应的起搏P'波,心房失夺获,提示心房起搏功能不良。

2、图中所示A5350ms未见心室起搏脉冲,随后出现长间歇,首先要排除特殊功能运作,最常见的最小化右心室起搏功能是美敦力的MVP,当起搏器运行在DDD模式时,它会定时转成AAI+模式进行房室传导检测,出现暂停发放一次VP的现象,但传导搜索的这一跳会出现AP推迟,延迟量为PAV-80ms,并在预计的下一个心房起搏后80ms发放备用心室起搏,但图中并不符合这一发放规律,据此可以排除美敦力的MVP功能。波科和百多力类似的最小化右心室起搏模式转换功能,均是在AV延长后出现VS时才会发生,不可能在AP-VP序列后直接出现QRS波脱落,故可排除。因此,A5PAV结束时没有发放VP,应该考虑起搏器的功能异常。若起搏器心室电极感知到信号,则会抑制VP发放,但心电图中未见QRS波出现,所以考虑心室电极发生了过感知。

3、V4为窄QRS波,是交界性逸搏,有一定的感知延迟落入VP产生的心室通道空白期内,功能性不感知,导致100ms后心室备用脉冲发放,因心室肌处在绝对不应期内功能性失夺获。失夺获后的A7出现PAV延长一跳,延长量为100ms,A7的心房脉冲以V4的备用脉冲重整VA间期,VA=AA1200-PAV350=850ms,使得A6-A7AA间期延长至1300ms, 随后A8恢复程控的PAV 350ms, 符合雅培AC(心室自动夺获)功能运作特点。不同品牌起搏器融合波排除法不相同,波科起搏器是AV间期延长64ms。百多力起搏器是AV间期延长65ms 或延长至滞后值(开启滞后功能),且都没有心室备用脉冲重整VA间期的特点,可排除。

4、综上分析,可明确本图的起搏器品牌为雅培,题干中告知该患者起搏器的低限频率设置为60/分,但图中所见,患者的心房起搏频率为50/分,该动态片段时间为半夜,考虑为休息频率功能运作。

答案为:

1、B:雅培

2、心电图诊断为:房室顺序起搏心律,DDD起搏模式,存在心房起搏功能不良和间歇性心室过感知,心室起搏功能未见异常,心房感知功能未能判断,可见AC功能、休息频率功能运作。窦性停搏,过缓的交界性逸搏,最长RR间期为2.336秒,ST-T改变。

解析老师黄颖珺佛山复星禅诚医院
审核老师:陈  妍 海宁市人民医院
                  朱明芳 宁国市人民医院
试题解析:(2)

根据题干,得知下限频率间期1000msPAV间期350msVA间期650ms,图中测得A2R2A3R3A4R4A6R5A8R7间期均为350ms,故推测此间期为PAV间期,A1A9脉冲均为心房起搏脉冲,A1A2A2A3A3A4A4A5A5A6A7A8A8A9间期均为1200ms(浅蓝色条块),比下限频率间期延长200ms,结合患者动态记录时间为凌晨325,推测起搏器此时处于休息频率、睡眠模式或者夜间频率;故此时的下限频率间期为1200msPAV间期仍为350ms(绿色条块),此时的VA间期为850ms(粉色条块)。

图中未见A脉冲带起心房除极波,故存在心房电极起搏不良;亦未见自身P波,考虑存在窦性停搏,未见VAT工作方式,心房感知功能是否良好不能判断。

R2R3R4R6R7呈右心室起搏图形,推测其为心室起搏脉冲带起的QRS波,心室起搏功能正常;A5A6中未见VP或者VS,且仍然以下限频率间期发放A脉冲,推测A5A6中存在着心室过感知事件,抑制了心室起搏脉冲的发放。R1R5均为自身QRS波图形,因心房电极起搏功能不良,心房起搏脉冲与R1R5应无下传关系,故推测其均为自身交界性逸搏,R5可见心室起搏脉冲落在QRS波上,产生伪室性融合波,导致功能性失夺获,其后100ms间期处(紫色条块)可见备用脉冲发放并重整VA间期(即VB脉冲—A7间期为850ms),导致A6A7间期延长至1300ms(黄色条块)。测得其后A7R6间期为450ms(蓝色条块),考虑为融合波排除功能运作,延长AV间期100ms之后恢复至程控PAV350ms,长AV恢复至短AV时,AA间期保持不变(A7A8间期仍为1200ms),VV间期缩短,且波科的心室备用脉冲发放间期为70ms,据此可排除波科起搏器(改良的心室计时方式),美敦力无融合波排除,亦可排除。

百多力E系列之前的双腔起搏器,融合波排除时,心室备用脉冲会重整下限频率间期(即AA间期),即A6A7间期应为PAV间期350ms+VB间期100ms+AA间期1200ms=1650ms,而不是1300ms,且AV间期的延长量为65ms,与此图中延长量为100ms不符合;百多力E系列之后双腔VCC融合波排除时,AV间期延长65ms,且心室备用脉冲不重整基础频率间期,不会导致AA间期延长至大于下限频率间期的情况,故可排除百多力起搏器。

从以上推测,此图为雅培起搏器的AC运作时的融合波排除算法,在起搏器认作“失夺获”时备用脉冲发放,启动融合波排除,延长AV间期100ms,出现心室夺获后恢复至程控AV间期。雅培双腔起搏器AC运作时,初始脉冲失夺获后,备用脉冲会重整VA间期导致AA间期较基础AA间期延长100ms,即1300ms

在推测出雅培起搏器的基础上,1200msAA间期考虑为起搏器的休息频率在运作。

110期试题分享答案:选B:雅培

心电图诊断为:

1、窦性停搏;

2、过缓的交界性逸搏;

3、ST-T改变

4、双腔起搏器,呈AAIDDD方式工作

心房起搏功能不良,心房感知不能判断;心室起搏功能未见明显异常,偶见心室起搏功能性失夺获,间歇性心室过感知;

5、假性室性融合波致心室备用脉冲发放及融合波排除,AC功能运作;

6、开启休息频率50/分。

解析老师邱建红 常山县中医医院
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

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  1. CONNECT:[ UseTime:0.001146s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001745s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.015115s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000650s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001628s ]
  6. SELECT * FROM `set` [ RunTime:0.000626s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001715s ]
  8. SELECT * FROM `article` WHERE `id` = 905421 LIMIT 1 [ RunTime:0.010584s ]
  9. UPDATE `article` SET `lasttime` = 1785983611 WHERE `id` = 905421 [ RunTime:0.011051s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.009675s ]
  11. SELECT * FROM `article` WHERE `id` < 905421 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003108s ]
  12. SELECT * FROM `article` WHERE `id` > 905421 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.019720s ]
  13. SELECT * FROM `article` WHERE `id` < 905421 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.029700s ]
  14. SELECT * FROM `article` WHERE `id` < 905421 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.039366s ]
  15. SELECT * FROM `article` WHERE `id` < 905421 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.041082s ]
0.355371s