Electrocardiographic right and left bundle branch block patterns in athletes: prevalence, pathology, and clinical
Jonathan H Kim1, Aaron L Baggish2
1Emory Clinical Cardiovascular Research Institute, Atlanta, GA, USA.
Insights
Differentiating benign electrocardiographic (ECG) patterns in athletes is crucial. While typical right bundle branch block (RBBB) may indicate exercise-induced changes, left bundle branch block (LBBB) often suggests underlying cardiac pathology.
Area of Science:
- Cardiology
- Sports Medicine
- Electrophysiology
Background:
- Distinguishing benign electrocardiographic (ECG) patterns in athletes from those indicating cardiac pathology is a significant clinical challenge.
- Complete right bundle branch block (RBBB) and left bundle branch block (LBBB) are uncommon in asymptomatic athletes.
- Current guidelines recommend further investigation for both RBBB and LBBB in athletes.
Purpose of the Study:
- To evaluate the association between RBBB and LBBB and underlying cardiac pathology in asymptomatic athletes.
- To differentiate exercise-induced cardiac remodeling from pathological conditions based on ECG findings.
Main Methods:
- Review of existing data and current expert consensus guidelines on ECG interpretation in athletes.
- Analysis of the prevalence and clinical significance of RBBB and LBBB in athletic populations.
Main Results:
- Typical RBBB in athletes may represent an ECG marker of exercise-induced right ventricular remodeling, not necessarily structural cardiac pathology.
- Asymptomatic LBBB in athletes is less likely associated with normal exercise physiology and more indicative of underlying cardiac pathology.
Conclusions:
- Current evidence suggests RBBB might be a benign finding related to athletic adaptation, whereas LBBB warrants further investigation for cardiac pathology.
- Long-term outcomes for athletes with RBBB or LBBB are still unknown.
- Refining athlete-specific ECG interpretation guidelines is necessary to improve diagnostic specificity.
Abstract:
Differentiating benign electrocardiographic (ECG) patterns in athletes from those representative of underlying cardiac pathology is both clinically relevant and challenging. Complete right (RBBB) and left (LBBB) bundle branch block are relatively rare in asymptomatic athletic populations, and current expert consensus guidelines recommend further clinical investigation upon detection of either ECG pattern. However, present data suggest that typical RBBB is not associated with structural cardiac pathology and may alternatively represent an ECG marker of exercise-induced right ventricular remodeling. In accordance with current guidelines, the presence of asymptomatic LBBB in athletes is not associated with normal exercise physiology and more likely indicative of underlying cardiac pathology. While long-term outcomes for asymptomatic athletes with RBBB or LBBB remain unknown, current evidence regarding these ECG patterns should be considered to improve the specificity of future athlete-specific ECG interpretation guidelines.
Related Concept Videos
01:18Dysrhythmias IV: Characteristics of Bradyarrhythmias
01:28Electrocardiogram Fundamentals
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
01:25ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
01:29Disturbances in Heart Rhythm
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
01:29Electrocardiogram
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
01:25Correlation between ECG and Cardiac Cycle
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...