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Published on: July 5, 2021
Causal relationship between Brugada syndrome and electrocardiogram traits: A bidirectional Mendelian randomization
Changxi Li1, Xinquan Wu1, Xudong Song1
1Department of Cardiology, Laboratory of Heart Center, Heart Center, Zhujiang Hospital, Southern Medical University, China; Guangdong Provincial Key Laboratory of Cardiac Function and Microcirculation, Department of Pathophysiology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China; Guangdong Provincial Biomedical Engineering Technology Research Center for Cardiovascular Disease, Zhujiang Hospital, Southern Medical University, Guangzhou, China.
This study used Mendelian randomization to find causal links between Brugada syndrome (BrS) and ECG traits. BrS has bidirectional causal links with P wave duration and PR interval, and positive links with QRS duration and QT interval.
Area of Science:
- Cardiovascular Genetics
- Electrocardiography
- Genetic Epidemiology
Background:
- Observational studies suggest associations between Brugada syndrome (BrS) and electrocardiogram (ECG) traits.
- Causal relationships remain uncertain in observational studies, necessitating robust investigation.
Purpose of the Study:
- To investigate the causal relationships between BrS phenotypic risk and various ECG traits.
- To utilize Mendelian randomization (MR) and colocalization analyses for causal inference.
Main Methods:
- Performed MR analysis to assess causality between BrS risk and ECG traits (P wave duration, PR interval, QRS duration, QT interval, heart rate).
- Utilized genetic instruments for BrS from large-scale Genome-Wide Association Studies (GWAS).
- Conducted sensitivity analyses (Cochran's Q test, MR-PRESSO) and colocalization analysis to validate findings.
Main Results:
- Identified positive causal relationships between BrS risk and P wave duration, PR interval, QRS duration, and QT interval.
- Found a negative causal relationship between BrS risk and heart rate.
- Detected bidirectional causal relationships between BrS risk and P wave duration and PR interval.
Conclusions:
- Confirmed bidirectional causal links between BrS phenotypic risk and P wave duration and PR interval.
- Established positive causal relationships between BrS risk and QRS duration and QT interval.
- Demonstrated a negative causal relationship between BrS risk and heart rate.
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