Fusion Pacing with Biventricular, Left Ventricular-only and Multipoint Pacing in Cardiac Resynchronisation Therapy:...

Area of Science:

• Cardiology
• Biomedical Engineering

Background:

• Cardiac resynchronisation therapy (CRT) has limitations in response rates and long-term effectiveness.
• Optimizing device timing intervals is a key modifiable factor for CRT efficacy post-implantation.

Purpose of the Study:

• To review fusion pacing as a strategy to improve patient outcomes in CRT.
• To explore methods for achieving fusion pacing and its impact on CRT efficacy.

Main Methods:

• Fusion pacing involves CRT with programming to maintain intrinsic atrioventricular (AV) conduction and right bundle branch activation.
• Methods assessed include dynamic algorithm-based optimization targeting narrowest QRS duration (QRSd) in patients with intact AV conduction.
• Individualized dynamic programming for fusion aims to maximize electrical synchrony.

Main Results:

• Shortening of QRS complex duration (QRSd) during CRT is linked to better clinical response.
• Dynamic optimization strategies have shown promise in heart failure patients with left bundle branch block and preserved AV conduction.
• Achieving fusion through individualized programming may lead to significant QRSd narrowing, indicating enhanced synchrony.

Conclusions:

• Fusion pacing represents a promising approach to enhance CRT efficacy by optimizing electrical synchrony.
• Individualized, dynamic programming strategies are crucial for achieving optimal fusion and improving patient outcomes.
• Further research into fusion pacing techniques could overcome current limitations in CRT response and durability.