The Electrocardiogram Characteristics and Pacing Parameters of Permanent Left Bundle Branch Pacing: a Systematic Review and Meta-analysis

Overview

Journal J Interv Card Electrophysiol

Publisher Springer

Date 2021 Jun 26

PMID 34173915

Citations 4

Authors

Jia Gao

Bing-Hang Zhang

Nan Zhang

Meng Sun

Rui Wang

Affiliations

Soon will be listed here.

Abstract

Purpose: Recent advances in conduction system pacing have led to the use of left bundle branch pacing (LBBP), which has potential advantages over His bundle pacing (HBP). For example, LBBP engages the electrical activation through the left bundle branch, produces ventricular electrical synchrony, and avoids the weakness of HBP such as lead instability, higher threshold, and early battery depletion. This pacing modality has been considered an attractive mode to achieve normal physiological pacing. However, as a new technology, LBBP is still in the stage of clinical exploration and lacks adequate evaluation. This study aims to investigate the electrocardiogram characteristics, pacing parameters, the safety, and the effectiveness of LBBP.

Methods: A computerized search of PubMed, Embase, and The Cochrane Library for the effects of LBBP was done. The baseline characteristics of patients, successful rate of implantation, capture threshold, R-wave amplitude, pacing impedance, QRS duration, and follow-up date were extracted and summarized.

Results: Thirteen studies including 712 patients were included in this analysis. The overall successful rate for implantation was 92.9%. The main indications for LBBP were atrioventricular block (AVB), sinus node dysfunction (SND), atrial fibrillation (AF) with slow ventricular rate, and cardiac resynchronization therapy (CRT) candidates. For patients with QRS duration>120 ms, permanent LBBP resulted in narrower QRS duration compared to that before implantation (P = 0.05). QRS duration and capture threshold of LBBP remained stable during follow-up. Moreover, there was higher R-wave amplitude and lower pacing impedance at follow-up compared to those at implantation (P = 0.01 and P < 0.00001, respectively).

Conclusions: Permanent LBBP has shown promising results for pacemaker-indicated patients in small observational studies. Good electrical synchronization, high success rates, and stable pacemaker lead parameters suggested significant advantages of LBBP in physiological pacing. Randomized controlled trials are needed to assess the efficacy of LBBP in patients.

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