Cardiac Fibrosis and Arrhythmogenesis.

Area of Science:

• Cardiovascular Physiology
• Cardiac Electrophysiology
• Fibrosis Research

Background:

• Cardiac remodeling, driven by various stressors, leads to heart dysfunction and arrhythmias.
• Fibrosis, a key component of remodeling, forms scar tissue that underlies many arrhythmias.
• Myofibroblasts and inflammation are increasingly recognized as direct contributors to arrhythmogenesis.

Purpose of the Study:

• To review current research on the role of cardiac fibrosis in arrhythmogenesis.
• To highlight the mechanisms by which fibrosis affects myocardial electrophysiology.
• To discuss the clinical and preclinical implications of understanding fibrosis in arrhythmias.

Main Methods:

• Review of existing scientific literature on cardiac fibrosis and arrhythmias.
• Analysis of studies investigating the electrophysiological effects of fibrosis.
• Examination of research on myofibroblast involvement and inflammatory contributions.

Main Results:

• Patchy or interstitial fibrosis impairs electrical propagation, promotes reentry, and increases ectopic activity.
• Activated fibroblasts (myofibroblasts) form electrical connections with cardiomyocytes, disrupting cardiac function.
• Inflammation contributes to both structural (fibrosis) and electrical remodeling, affecting ion channels and calcium handling.

Conclusions:

• Cardiac fibrosis is a critical substrate for arrhythmias, involving both structural and electrical remodeling.
• Understanding fibrosis mechanisms is crucial for developing diagnostic tools (imaging, biomarkers) and therapeutic strategies (antifibrotic agents).
• Further research is needed to address remaining questions and advance antifibrotic treatments.