Mechanisms of persistent atrial fibrillation

Area of Science:

• Cardiology
• Molecular Biology
• Pathophysiology

Background:

• Atrial fibrillation (AF) is the most common sustained arrhythmia.
• Mechanisms underlying persistent or permanent AF are poorly understood.
• Identifying factors contributing to AF perpetuation is crucial for effective treatment.

Purpose of the Study:

• To review common signaling pathways promoting atrial structural and electrical remodeling.
• To understand the molecular basis of atrial fibrillation perpetuation.
• To identify potential therapeutic targets for persistent AF.

Main Methods:

• Literature review of studies on atrial fibrillation mechanisms.
• Analysis of signaling pathways involved in cardiac remodeling.
• Synthesis of information on molecular factors in AF perpetuation.

Main Results:

• Sustained AF can induce inflammation, activating myofibroblasts and releasing cytokines (e.g., TGF-β, PDGF) and profibrotic proteins (e.g., galectin-3).
• Signaling cascades involving these proteins are critical for fibrosis development and ion channel dysfunction.
• These molecular events contribute to electrical and structural remodeling, perpetuating AF.

Conclusions:

• Targeting common molecular pathways for fibrosis and electrical remodeling is a promising therapeutic strategy for persistent AF.
• Identifying genes with pleiotropic effects on ion channels and profibrotic molecules is a key goal.
• New therapeutic approaches could focus on modulating these pathways to treat pathological remodeling in AF.