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Body surface map patterns of altered depolarization and repolarization in right bundle branch block
Circulation
|March 1, 1980
Summary
Right bundle branch block causes delayed and fragmented right ventricular depolarization and abnormal repolarization patterns. These surface map findings highlight the complex electrical changes in the heart during this condition.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Imaging
Background:
- Right bundle branch block (RBBB) is a common cardiac condition affecting ventricular activation.
- Understanding the electrical propagation patterns in RBBB is crucial for diagnosing and managing heart disease.
Purpose of the Study:
- To analyze surface electrocardiographic (ECG) maps during depolarization and repolarization in patients with RBBB.
- To identify and characterize specific abnormalities in electrical activity associated with RBBB.
Main Methods:
- Surface ECG mapping was performed on 14 patients diagnosed with RBBB.
- Analysis focused on the temporal and spatial characteristics of epicardial breakthrough and ventricular repolarization.
Main Results:
- All patients exhibited delayed and left-shifted epicardial breakthrough, along with right upper anterior positivity during depolarization, indicating fragmented conduction.
- Five distinct abnormal repolarization patterns were observed, varying in spatial distribution of positive and negative potentials.
Conclusions:
- The observed depolarization abnormalities in RBBB are attributed to delayed and dyssynchronous right ventricular activation.
- Altered repolarization patterns are likely influenced by the sequence of cardiac activation and underlying disease processes.