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Published on: December 11, 2017

Mechanisms of ventricular arrhythmias in heart failure

Matthew W Ebinger1, Subramaniam Krishnan, Claudio D Schuger

  • 1Cardiac Electrophysiology, Heart and Vascular Institute, Henry Ford Health System, 2799 W. Grand Blvd, Room E 235, Detroit, MI 48202, USA. mwebinger@yahoo.com

Current Heart Failure Reports
|September 6, 2005
PubMed

Insights

Sudden death from congestive heart failure is often caused by ventricular arrhythmias. This overview explores the complex mechanisms, including myocardial scar and altered ion handling, driving these life-threatening heart rhythm disturbances.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Heart Failure Research

Background:

  • Congestive heart failure (CHF) is a major global health concern, leading to significant mortality and morbidity.
  • Sudden cardiac death accounts for approximately 50% of deaths in CHF patients, primarily due to ventricular arrhythmias like tachycardia and fibrillation.

Purpose of the Study:

  • To provide a comprehensive overview of the underlying mechanisms responsible for ventricular arrhythmias in patients with chronic heart failure.
  • To elucidate the complex electrophysiological changes contributing to arrhythmogenesis in the failing heart.

Main Methods:

  • Review of existing literature on the pathophysiology of ventricular arrhythmias in heart failure.
  • Analysis of proposed mechanisms including myocardial scar, ion channel dysfunction, and altered calcium handling.

Main Results:

  • Myocardial scar tissue is identified as a significant substrate for reentrant ventricular arrhythmias in ischemic heart failure.
  • Dysregulation of calcium handling and potassium currents contributes to afterdepolarizations, increasing arrhythmia risk.
  • Compensatory mechanisms in heart failure can paradoxically become arrhythmogenic.

Conclusions:

  • Ventricular arrhythmias in CHF are multifactorial, involving structural changes like myocardial scar and functional electrical remodeling.
  • Understanding these complex mechanisms is crucial for developing targeted therapies to prevent sudden cardiac death in heart failure patients.

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