Pacing site in pacemaker dependency: is right ventricular septal lead position the answer?

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Pacing

Background:

• Traditional right ventricular apex pacing for atrioventricular block may negatively impact left ventricular (LV) function, potentially increasing heart failure risk and mortality.
• Right ventricular septal pacing has been investigated as an alternative to mitigate LV dysfunction, but clinical evidence remains conflicting.

Purpose of the Study:

• To evaluate the impact of different cardiac pacing sites on left ventricular function in patients with atrioventricular block.
• To discuss the challenges in predicting optimal pacing strategies and the importance of ongoing cardiac monitoring.

Main Methods:

• Review of experimental data and clinical studies comparing right ventricular apex pacing versus septal pacing.
• Analysis of factors influencing left ventricular function, including baseline function and comorbidities, irrespective of pacing site.

Main Results:

• Experimental data suggest septal pacing may protect LV function, but large clinical studies have yielded conflicting results, with one recent study showing no protective effect.
• Predicting the optimal pacing method for individual patients remains challenging due to varied outcomes and the influence of other clinical factors.

Conclusions:

• The optimal pacing strategy for patients with atrioventricular block is not definitively established, and conflicting clinical data exist regarding septal pacing benefits.
• Continued monitoring of cardiac function post-implant is crucial for managing patients with atrioventricular block, and an updated management algorithm is proposed.