Left bundle branch area pacing in patients with heart failure and right bundle branch block: Results from International LBBAP Collaborative-Study Group.

Fecha de publicación: 01/08/2022 Fecha Ahead of Print: 14/05/2022

Autores de IIS La Fe

• Óscar Cano Pérez

  Autor

Participantes ajenos a IIS La Fe

• Vijayaraman, Pugazhendhi
• Ponnusamy, Shunmuga Sundaram
• Molina-Lerma, Manuel
• Chan, Joseph Y. S.
• Padala, Santosh K.
• Sharma, Parikshit S.
• Whinnett, Zachary I.
• Herweg, Bengt
• Upadhyay, Gaurav A.
• Subzposh, Faiz A.
• Patel, Neil R.
• Beer, Dominik A.
• Bednarek, Agnieszka
• Kielbasa, Grzegorz
• Tung, Roderick
• Ellenbogen, Kenneth A.
• Jastrzebski, Marek

Grupos

• Grupo de Investigación Clínica y Traslacional en Cardiología

  

  Investigador Principal

  Esther Roselló Lletí

Abstract

BACKGROUND: Cardiac resynchronization therapy (CRT) using biventricular pacing has limited efficacy in patients with heart failure (HF) and right bundle branch block (RBBB). Left bundle branch area pacing (LBBAP) is a novel physiologic pacing option. OBJECTIVE: The aim of the study was to assess the feasibility and outcomes of LBBAP in HF patients with RBBB and reduced left ventricular systolic function, and indication for CRT or ventricular pacing. METHODS: LBBAP was attempted in patients with left ventricular ejection fraction (LVEF) <50%, RBBB, HF, and indications for CRT or ventricular pacing. Procedural, pacing, and electrocardiographic parameters; clinical response (no HF hospitalization and improvement in NYHA class); and echocardiographic response (=5% increase in ejection fraction) to LBBAP were assessed. RESULTS: LBBAP was attempted in 121 patients and successful in 107 (88%). Patient characteristics included age 74 ± 12 years, female 25%, ischemic cardiomyopathy 49%, and ejection fraction 35% ± 9%. QRS axis at baseline was normal in 24%, left axis 63%, right axis 13%. LBBAP threshold and R-wave amplitudes were 0.8 ± 0.3 V @ 0.5 ms and 10 ± 9 mV at implant and remained stable during mean follow-up of 13 ± 8 months. LBBAP resulted in narrowing of QRS duration (156 ± 20 ms to 150 ± 24 ms (P = .01) with R-wave peak times in V(6) of 85 ± 16 ms. LVEF improved from 35% ± 9% to 43% ± 12% (P < .01). Clinical and echocardiographic response was observed in 60% and 61% of patients, respectively. Female sex and reduction in QRS duration with LBBAP were predictive of echocardiographic response and super-response. CONCLUSION: LBBAP is a feasible alternative to deliver CRT or physiologic ventricular pacing in patients with RBBB, HF, and LV dysfunction.

© 2022 Heart Rhythm Society. Published by Elsevier Inc.

Keywords

• Cardiac resynchronization therapy; Cardiomyopathy; Heart failure; Left bundle branch area pacing; Right bundle branch block