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阜外医院华伟等新方法改进希氏束起搏技术

2020-01-19 循环 中国循环杂志

希氏束起搏因其夺获心脏固有传导系统,保证了正常的心室激动顺序,是最符合生理的起搏方式。然而传统希氏束起搏因缺少解剖标识而电极多植入希氏束近端部位,该部位因靠近心房而R波感知多偏低,容易发生起搏感知不足情况。另外,近端希氏束起搏通常阈值偏高,特别对于希氏束远端发生阻滞或者束支阻滞的患者,因而未得到全面临床推广和应用。理论上说,起搏希氏束远端能够跨越阻滞部位从而解决上述难题。近期,阜外医院华伟教授等在

希氏束起搏因其夺获心脏固有传导系统,保证了正常的心室激动顺序,是最符合生理的起搏方式。然而传统希氏束起搏因缺少解剖标识而电极多植入希氏束近端部位,该部位因靠近心房而R波感知多偏低,容易发生起搏感知不足情况。

另外,近端希氏束起搏通常阈值偏高,特别对于希氏束远端发生阻滞或者束支阻滞的患者,因而未得到全面临床推广和应用。理论上说,起搏希氏束远端能够跨越阻滞部位从而解决上述难题。

近期,阜外医院华伟教授等在起搏电生理专业杂志《Journal of Cardiovascular Electrophysiology》的“创新技术”栏目上,首次提出了一种利用三尖瓣环造影的方法来指导希氏束远端起搏。

解剖上,希氏束连接于房室结远端,穿中央纤维体走行在三尖瓣环室间隔膜部下方。因此,右前斜30°透视下,通过操作希氏束专用鞘管,跨越三尖瓣到达三尖瓣隔叶下方,推注造影剂清晰显示三尖瓣环解剖位置,借助解剖标志,可以将起搏电极送入希氏束远端部位进行起搏。

该方法的应用经验成果同步发表在JCE和PACE等专业电生理杂志上。

华伟教授指出,三尖瓣环造影的方法指导希氏束远端起搏具有明显优势:

1、希氏束远端纤维包饶成分更少,因而起搏该部位所需阈值更低;

2、电极头端位于心室侧,因此R波感知更好;

3、起搏远端部位更能够跨越房室结下阻滞部位,更容易纠正结下阻滞和束支阻滞;

4、起搏在夺获希氏束的同时,能够夺获希氏束周围的心室肌,发挥安全备份作用。

5、此外,三尖瓣环造影的方法可以提供希氏束解剖走行的关系,借助解剖定位,能够降低手术难度,减少手术事件和X线透视时间,缩短学习曲线时间,对于解剖结构异常的患者能够指导快速定位希氏束,同时可以帮助希氏束起搏初学者快速掌握这项技术。

来源:

[1] Gu M, Hu Y, Hua W, et al. Visualization of tricuspid valve annulus for implantation of His bundle pacingin patients with symptomatic bradycardia. J Cardiovasc Electrophysiol, 2019, 1-6.

[2] Hu Y, Gu M, Hua W, et al. Left bundle branch pacing from distal His‐bundle region by tricuspid valve annulus angiography]. J Cardiovasc Electrophysiol, 2019, 1-4.

3. Gu M, Hu Y, Hua W, et al. Electrocardiographic characteristics of distal His bundle pacing in a patient with left bundle branch block. Pacing Clin Electrophysiol, 2019, 1–3.

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