Researchers recently evaluated the impact of RV septal lead placement on long-term clinical outcomes using CT imaging for precise anatomical adjudication. While physicians often prefer septal pacing to avoid pacing-induced cardiomyopathy, prior studies have offered conflicting results. This retrospective cohort study from the University of Pittsburgh Medical Center analyzed 657 patients. Consequently, the team discovered that CT-confirmed septal leads did not significantly improve survival or reduce heart failure hospitalizations compared to non-septal leads.

The primary outcome involved a composite of heart failure hospitalization, atrial fibrillation admission, and all-cause mortality. The study results showed a composite endpoint occurrence in 70.2% of patients over a median follow-up of 5.3 years. Specifically, 62.7% of the septal group experienced the endpoint compared to 72.4% in the non-septal group. Furthermore, multivariable-adjusted models revealed no significant association between lead position and the composite outcome. Additionally, longitudinal changes in left ventricular ejection fraction remained similar across both cohorts.

Clinical Impact of RV Septal Lead Placement

Historically, the right ventricular apex was the standard site for lead placement. However, clinicians moved toward the septum to achieve more physiological activation. This study utilized cardiac CT to provide superior anatomical adjudication, which is often more accurate than traditional fluoroscopy. Despite the theoretical benefits, the data suggests that precise septal positioning does not offer a clinical advantage over other non-septal locations in this population. Therefore, precise anatomical positioning confirmed by CT may not translate into superior clinical benefits for most patients.

Frequently Asked Questions

Why did the study use CT imaging for lead adjudication?

Cardiac CT provides superior anatomical detail compared to standard chest X-rays or fluoroscopy. This allowed researchers to confirm the exact position of the pacemaker lead with high precision.

Did the study find any benefit for septal pacing?

No, the research indicated that septal lead placement was not associated with improved clinical outcomes or better preservation of the left ventricular ejection fraction compared to non-septal leads.

Disclaimer: This content is for informational and educational purposes only... Refer to the latest local and national guidelines for clinical practice.

References

Osterhaus EC et al. Outcomes of Septal Versus Non-Septal Right Ventricular Pacemaker Leads as Adjudicated by CT Imaging. J Cardiovasc Electrophysiol. 2026 Mar 15. doi: 10.1111/jce.70307. PMID: 41832769.

Leclercq C, et al. Septal versus apical pacing sites in permanent right ventricular pacing: The multicentre prospective SEPTAL-PM study. Arch Cardiovasc Dis. 2022;115(5):263-272.

Kaye GC, et al. Effect of right ventricular pacing lead site on left ventricular function in patients with high-grade atrioventricular block: results of the Protect-Pace study. Eur Heart J. 2015;36(14):856-862.