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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
12:45

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

Published on: December 11, 2017

Effect of cardiac resynchronization on gradient reduction in patients with obstructive hypertrophic cardiomyopathy:

Radosław Lenarczyk1, Aleksandra Woźniak, Oskar Kowalski

  • 1Department of Cardiology, Congenital Heart Diseases and Electrotherapy, Medical University of Silesia, Silesian Center for Heart Disease, Zabrze, Poland. elfizab@poczta.onet.pl

Pacing and Clinical Electrophysiology : PACE
|August 13, 2011
PubMed

Insights

Cardiac resynchronization therapy (CRT) effectively reduced outflow tract gradients and improved functional capacity in hypertrophic obstructive cardiomyopathy (HOCM) patients needing an implantable cardioverter-defibrillator (ICD). These findings suggest CRT is a promising treatment for HOCM symptom management.

Area of Science:

  • Cardiology
  • Medical Devices
  • Heart Failure Management

Background:

  • Hypertrophic obstructive cardiomyopathy (HOCM) presents significant challenges in managing outflow tract gradients and functional status.
  • Patients with HOCM often require implantable cardioverter-defibrillators (ICDs) for arrhythmia management.

Purpose of the Study:

  • To evaluate the efficacy of cardiac resynchronization therapy (CRT) in reducing the outflow tract gradient.
  • To assess functional improvements in symptomatic HOCM patients undergoing CRT in conjunction with ICD implantation.

Main Methods:

  • A cohort of 11 symptomatic HOCM patients with significant gradients and ICD indications underwent CRT-D implantation.
  • Nine patients with successful procedures were monitored for changes in NYHA class, outflow gradient, mechanical dyssynchrony, QRS width, and exercise capacity (6MWD, VO2peak) at 6 months and long-term.

Main Results:

  • After 6 months, CRT significantly reduced NYHA class, peak and mean outflow tract gradients, and intraventricular dyssynchrony.
  • Patients demonstrated significant improvements in QRS width and peak oxygen consumption (VO2peak).
  • Long-term follow-up showed further reduction in outflow tract gradients, with 67% achieving a >50% reduction.

Conclusions:

  • Cardiac resynchronization therapy (CRT) shows promise as an effective intervention for reducing outflow tract gradients in HOCM patients.
  • CRT can lead to significant functional status improvement in symptomatic HOCM patients requiring ICDs.
  • Further extensive studies are warranted to confirm these preliminary findings.
Abstract

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