DISCUSSION

This retrospective study evaluates the clinical translation, procedural feasibility, and safety profiles of initial institutional adoption a left bundle branch area pacing (LBBAP) within a lower-volume provincial cardiovascular tertiary-care center utilizing a standard electrocardiogram-guided catheterization laboratory workflow. Our principal findings demonstrate that LBBAP initiation is highly feasible and safe, achieving a high procedural success rate of 85.7% and an exceptionally low short-term complication rate (1.8%).

The 85.7% procedural success rate observed during our first-year implementation phase aligns closely with pioneering multi-center cohorts and large-scale registries, which historically report success rates ranging between 89% and 95%. (5-7) Crucially, the vast majority of existing LBBAP data originate from high volume tertiary academic medical centers with extensive electrophysiological resources and specialized operator experience. However, our real-world data demonstrate that a lower volume provincial hospital can replicate these rigorous electrophysiological metrics. This success underscores the robustness and reproducibility of standard ECG-guided implantation techniques, proving that extensive subspecialty volume is not a mandatory prerequisite to establishing a safe and clinically effective conduction system pacing program.

From an electrophysiological perspective, the primary therapeutic objective of LBBAP is to circumvent the non-physiological ventricular dyssynchrony and subsequent pacemakerinduced cardiomyopathy (PICM) frequently caused by traditional right ventricular apex pacing. In our cohort, this physiological synchronization was objectively confirmed by a significant reduction in mean QRS duration from 129.6 ± 3.15 ms at baseline to 113.5±3.15 ms post-implantation (p = .0001). By directly capturing the native conduction system, as evidenced by a left ventricular activation time (LVAT) of <80 ms and characteristic precordial incomplete right bundle branch block (ICBBB) patterns, the technique preserves or restores physiological left-to-right ventricular propagation. 91.1% of patients achieving an optimal QRS duration of ≤ 130 ms.

A key contribution of this study is the granular, chronological characterization of the operative learning curve during the program’s initiation phase. We observed a distinct and continuous numerical decline in median procedural durations, decreasing from 95.0 minutes in the first quarter to 65.0 minutes by the final quarter, representing a 32.6% improvement in procedural efficiency. Interestingly, while a clear downward trend in medians was apparent for both operative and fluoroscopic times, non-parametric statistical evaluation did not yield statistical significance across the quarters (p = .073 for procedural time; p = .068 for fluoroscopic time). Our findings highlight a critical statistical paradox that frequently characterizes the clinical adoption of novel cardiac interventions. While the overall analysis did not achieve statistical significance due to prominent upper-bound outliers in the final quarter, these data must be interpreted through a clinical lens. Rather than reflecting a lack of technical proficiency, these late-stage outliers represent a standard evolutionary phase in the operator’s learning curve: as routine cases are mastered in Quarters 1–3, operator confidence increases, leading to the deliberate selection of highly complex anatomical variations and challenging substrates in Quarter 4. This interpretation is firmly supported by the steady narrowing of the IQRs across successive quarters, which confirms that procedural efficiency was optimizing and stabilizing for the vast majority of standard cases.

The clinical safety profile demonstrated during our first-year experience further supports the safety of migrating LBBAP to a lower-volume provincial cardiovascular tertiary-care center utilizing a standard electrocardiogram-guided catheterization laboratory workflow. No acute, major perioperative complications, such as acute septal perforation, coronary artery injury, or cardiac tamponade, were encountered. The sole adverse event recorded was an isolated case of late lead dislodgement (1.8%) occurring 10 days post-procedure, which was successfully managed via standard percutaneous repositioning without long-term sequelae. This remarkably low complication rate satisfies international safety benchmarks and confirms that the technical demands of deep septal lead deployment do not inherently compromise patient safety when introduced systematically into a new center.

Study Limitations

This study has several limitations that should be acknowledged. First, it was a single-center, retrospective cohort study with a relatively modest sample size (N = 56), which reflects the initial year of institutional adoption in a lower-volume provincial cardiovascular tertiary-care center. Second, the follow-up window was restricted to the short-term post-procedural period (30 days), preventing the evaluation of long-term lead performance parameters (such as chronic capture thresholds and sensing stability) or hard clinical endpoints (including heart failure hospitalizations and all-cause mortality). Finally, because this study lacked a contemporary parallel control group undergoing conventional right ventricular pacing, direct comparative assertions regarding long-term clinical superiority within this specific provincial setting cannot be definitively made. Future prospective, multi-center trials with extended follow-up durations are warranted to confirm the long-term clinical and economic benefits of widespread LBBAP adoption in community healthcare infrastructures.