Electro-Mechanical Alterations in Atrial Fibrillation: Structural, Electrical, and Functional Correlates

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Imaging

Background:

• Atrial fibrillation (AF) is the most prevalent arrhythmia, impacting patient survival and well-being.
• Cardiovascular risk factors and aging contribute to atrial myocardial structural remodeling, a key driver of AF.
• Structural remodeling encompasses atrial fibrosis, altered size, and cellular changes like myolysis and glycogen accumulation.

Purpose of the Study:

• To explore the relationship between atrial myocardial structural remodeling and atrial fibrillation.
• To investigate the electrical and functional correlates of conduction disturbances in the atria.
• To evaluate the utility of echocardiography-derived total atrial conduction time in reflecting atrial alterations.

Main Methods:

• Review of existing literature on atrial fibrillation pathophysiology and cardiac remodeling.
• Analysis of electrical correlates, including P wave parameters and electrophysiological mapping.
• Assessment of functional correlates using echocardiography and cardiac magnetic resonance imaging (MRI).

Main Results:

• Structural remodeling, including fibrosis and cellular changes, is associated with interatrial block.
• Conduction disturbances manifest as altered P wave parameters and abnormal electrophysiological characteristics.
• Echocardiography-derived total atrial conduction time (PA-TDI duration) shows potential to reflect both electrical and structural atrial alterations.

Conclusions:

• Atrial myocardial structural remodeling is a significant factor in the development of atrial fibrillation.
• Interatrial block and prolonged conduction times are key electrical manifestations of these structural changes.
• Echocardiography-derived total atrial conduction time offers a potential non-invasive marker for assessing atrial remodeling in AF.