Focus on right ventricular outflow tract septal pacing

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Pacing

Background:

• Right ventricular apical pacing (RVAP) is linked to adverse left ventricular (LV) remodeling and desynchronization.
• This risk is elevated in patients with moderate LV dysfunction, manifesting after prolonged pacing.
• RVAP can contribute to organic mitral insufficiency, prompting research into alternative pacing sites.

Purpose of the Study:

• To evaluate the long-term effects of RVAP on LV remodeling and function.
• To compare the clinical outcomes of RVAP with alternative pacing strategies like right ventricular outflow tract (RVOT) septal pacing.
• To identify potential benefits of infundibular septal pacing over RVAP.

Main Methods:

• Review of experimental and clinical studies on RVAP and alternative pacing.
• Analysis of prospective randomized studies and meta-analyses comparing RVAP and RVOT septal pacing.
• Consideration of ongoing multicenter randomized trials assessing infundibular septal pacing.

Main Results:

• RVAP can lead to significant LV desynchronization and remodeling, particularly after one year.
• Current studies show modest medium-term effects of RVOT septal pacing on ejection fraction, with no significant impact on quality of life or survival.
• Previous comparative studies may lack sufficient statistical power and homogeneity.

Conclusions:

• RVAP poses long-term risks to LV function and remodeling.
• Current evidence for RVOT septal pacing offers limited clinical advantages over RVAP.
• Further robust research, including ongoing trials, is necessary to definitively assess infundibular septal pacing's efficacy and patient prognosis.