Impact of QRS morphology on response to conduction system pacing after atrioventricular junction ablation

Shengjie Wu, Mengxing Cai, Rujie Zheng, Songjie Wang, Limeng Jiang, Lei Xu, Ruiyu Shi, Fangyi Xiao, Kenneth A. Ellenbogen, Yongmei Cha, Lan Su, Weijian Huang

Research output: Contribution to journalArticlepeer-review


Aims: His–Purkinje conduction system pacing (HPCSP) utilizing His (HBP) or left bundle branch pacing (LBBP) in patients with atrial fibrillation (AF) and wide QRS duration has not been well studied. We assessed the benefit of left bundle branch block (LBBB) correction during HPCSP in AF patients undergoing atrioventricular junction (AVJ) ablation with LBBB, compared with those with narrow QRS duration. Methods and results: This is an observational study in consecutive patients with typical LBBB or narrow QRS duration in whom we attempted HPCSP after AVJ ablation for refractory AF with a left ventricular ejection fraction (LVEF) ≤ 50%. Echocardiographic responses and clinical outcomes were assessed at baseline and during 1 year of follow-up. A total of 178 patients were enrolled, of which 170 achieved AVJ ablation + permanent HPCSP (age 69.3 ± 10.1 years; LVEF 34.3 ± 7.7%), 133 (78.2%) patients had a narrow QRS duration, and 37 (21.2%) had an LBBB. The QRS duration changed from a baseline of 159.7 ± 16.6 ms to a paced QRS duration of 110.4 ± 12.7 ms in the LBBB cohort and from 95.6 ± 10.4 to 100.8 ± 14.5 ms (both P < 0.001) in the narrow QRS cohort after AVJ ablation and pacing. Compared with the narrow QRS cohort, the LBBB cohort showed a greater absolute increase in LVEF (+22.3% vs. +14.2%, P < 0.001), higher super responder rate (71.4% vs. 49.2%, P = 0.011), and greater New York Heart Association (NYHA) class improvement (−1.9 vs. −1.4, P < 0.001) at 1 year. Conclusion: Patients with LBBB have greater improvement in LVEF and NYHA class function than patients with narrow QRS from HPCSP after AVJ ablation.

Original languageEnglish (US)
Pages (from-to)1195-1203
Number of pages9
JournalESC Heart Failure
Issue number2
StatePublished - Apr 2021


  • Atrial fibrillation
  • Atrioventricular junction ablation
  • His bundle pacing
  • His–Purkinje conduction system pacing
  • Left bundle branch block
  • Left bundle branch pacing

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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