Related Experiment Video
Updated: May 17, 2026
08:10
Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
Published on: July 20, 2022
Atrial electrical and structural remodeling: implications for racial differences in atrial fibrillation
Chu-Pak Lau1, Hung-Fat Tse, Chung-Wah Siu
1Cardiology Division, Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong SAR, China. cplau@hkucc.hku.hks
Journal of Cardiovascular Electrophysiology
|November 13, 2012
Summary
Racial disparities in atrial fibrillation (AF) prevalence exist due to ethnic differences in susceptibility to traditional risk factors. Genetic variations likely contribute to these varying electromechanical mechanisms underlying AF development.
Area of Science:
- Cardiology
- Electrophysiology
- Genetics
Background:
- Racial differences in atrial fibrillation (AF) prevalence and incidence are documented, persisting after accounting for known risk factors and ascertainment bias.
- This suggests inherent ethnic variations in susceptibility to factors triggering AF.
- Atrial fibrillation development involves triggers, autonomic factors, atrial substrate, and electromechanical remodeling.
Purpose of the Study:
- To review the electrophysiologic mechanisms of atrial fibrillation.
- To examine evidence for racial differences in AF susceptibility.
- To propose potential electromechanical explanations for these observed disparities.
Main Methods:
- Literature review of studies on atrial fibrillation mechanisms.
- Analysis of existing data on racial/ethnic variations in AF prevalence and incidence.
- Synthesis of genetic and electrophysiological findings related to AF.
Main Results:
- Evidence indicates ethnic groups exhibit differing susceptibilities to traditional AF risk factors.
- Genetic variations among racial groups are implicated as a contributing factor to AF disparities.
- Electromechanical remodeling plays a role in the progression of AF.
Conclusions:
- Racial disparities in AF are influenced by genetic factors affecting susceptibility to traditional risk factors.
- Differences in atrial substrate and electromechanical properties likely underlie ethnic variations in AF.
- Further research into genetic and electrophysiological mechanisms is warranted to understand and address AF disparities.
Related Concept Videos
01:25ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
01:25Dysrhythmias VI: Management of Dysrhythmias
Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
01:28Mechanism of Cardiac Arrhythmias
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
01:29Disturbances in Heart Rhythm
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
01:19Electrophysiology of Normal Cardiac Rhythm
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
01:23Rheumatic Heart Disease I: Introduction
Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...