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Published on: December 11, 2017
Left Bundle Branch Area Pacing in Congenital Heart Disease: Current Evidence, Challenges, and Future Directions
1Division of Cardiology, Department of Internal Medicine, Iwate Medical University School of Medicine, Yahaba, Japan.
Insights
Left bundle branch area pacing (LBBAP) offers a promising alternative for congenital heart disease (CHD) patients. This review synthesizes evidence on LBBAP in CHD, highlighting its potential and research needs.
Area of Science:
- Cardiology
- Electrophysiology
- Congenital Heart Disease
Background:
- Right ventricular apical pacing is standard for congenital heart disease (CHD), but Left bundle branch area pacing (LBBAP) is an emerging alternative.
- Unique anatomical and physiological challenges in CHD patients make LBBAP application underexplored.
Purpose of the Study:
- To synthesize current evidence on LBBAP in CHD patients.
- To provide a framework for patient selection, lead choice, and procedural planning.
- To identify research priorities for LBBAP in CHD.
Main Methods:
- Review of current evidence on LBBAP in CHD.
- Analysis of anatomical considerations, lead selection, technical modifications, and clinical outcomes.
- Inclusion of data from observational series and meta-analyses.
Main Results:
- Favorable anatomy for LBBAP in congenitally corrected transposition of the great arteries (CCTGA) with high success rates (86%-100%).
- Conduction system pacing (CSP) showed superior QRS narrowing compared to conventional CRT (35 vs. 14 ms).
- Lumenless and stylet-driven leads show comparable success but different safety profiles.
Conclusions:
- LBBAP is a viable option in CHD, particularly in CCTGA.
- Lead selection requires careful consideration of safety profiles in CHD patients.
- Further research is needed to establish LBBAP's role and optimize its application in CHD.
Abstract:
Left bundle branch area pacing (LBBAP) has emerged as a promising alternative to right ventricular apical pacing in patients with congenital heart disease (CHD), yet its application in this population remains underexplored despite unique anatomical and physiological challenges. This review synthesizes current evidence on LBBAP in CHD, including anatomical considerations of the conduction system, lead selection between lumenless and stylet-driven leads, technical modifications for different substrates, and clinical outcomes. In congenitally corrected transposition of the great arteries (CCTGA), the paradoxically anterior conduction system creates favorable anatomy for LBBAP, with reported success rates of 86%-100% in small observational series. CHD-specific data from Moore et al. demonstrated superior QRS narrowing with conduction system pacing (CSP) compared to conventional CRT (35 vs. 14 ms; p = 0.04). One randomized trial and multiple meta-analyses comparing lumenless and stylet-driven leads demonstrate comparable success rates but distinct safety profiles, with implications for lead choice in CHD patients requiring lifelong pacing. The 2023 HRS/APHRS/LAHRS and 2025 ACC/AHA guidelines now recognize CSP as a therapeutic option in selected patients, though these endorsements are not specific to LBBAP in CHD. CHD-specific evidence remains limited to case series and small observational studies. This review provides a practical framework for patient selection, lead choice, and procedural planning while identifying key research priorities for this growing patient population.
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