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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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The BRIGHT study: bifocal right ventricular resynchronization therapy: a randomized study.

Jan C J Res¹, Marcel J J A Bokern, Carel C de Cock

¹Department of Cardiology, Ba 579, Erasmus Medical Centre Rotterdam, PO Box 2040, 3000 CA Rotterdam, The Netherlands. j.res@erasmusmc.nl

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology

|August 9, 2007

Summary

Bifocal right ventricular (RV) pacing significantly improved heart failure symptoms and function in patients eligible for cardiac resynchronization therapy (CRT). This innovative pacing strategy enhanced left ventricular ejection fraction and quality of life.

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Area of Science:

Cardiology
Medical Devices
Heart Failure Management

Background:

Cardiac resynchronization therapy (CRT) is indicated for heart failure patients with specific criteria.
Optimizing right ventricular (RV) pacing strategies is crucial for improving CRT outcomes.
Bifocal RV pacing involves stimulation at both the apex and outflow tract.

Purpose of the Study:

To evaluate the efficacy of bifocal RV pacing compared to standard pacing in CRT-eligible patients.
To assess improvements in left ventricular (LV) ejection fraction (EF), 6-minute walk test, quality of life, and NYHA classification.
To determine if bifocal RV pacing offers advantages over conventional pacing modes.

Main Methods:

A single-blind, randomized crossover study (BRIGHT trial) was conducted.
Forty-two patients with chronic heart failure (NYHA class III-IV, EF<35%, QRS≥120ms, LBBB) were enrolled.
Patients were randomized to receive either 3 months of bifocal RV pacing or a control pacing mode.

Main Results:

Bifocal RV pacing significantly improved LV EF (26% to 36%, P<0.0008) and NYHA classification (2.8 to 2.3, P<0.007).
The 6-minute walk test distance increased (372m to 453m, P<0.05) and Minnesota Living with Heart Failure scores decreased (33 to 24, P<0.006).
No significant changes were observed in the control pacing group; some patients intolerant to control pacing improved upon switching to bifocal pacing.

Conclusions:

Bifocal RV pacing demonstrates significant benefits in CRT-eligible patients.
This pacing strategy leads to comprehensive improvements in cardiac function and patient-reported outcomes.
Bifocal RV pacing represents a promising advancement in heart failure management.