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Exploring the causal pathway from ischemic stroke to atrial fibrillation: a network Mendelian randomization study
Lei Hou1,2, Mingqing Xu3, Yuanyuan Yu1,2
1Healthcare Big Data Institute of Shandong University, Jinan, 250000, People's Republic of China.
Molecular Medicine (Cambridge, Mass.)
|January 17, 2020
Summary
High blood pressure mediates the link between ischemic stroke and atrial fibrillation, suggesting blood pressure management is key for stroke patients. Lowering blood pressure may improve outcomes for those with ischemic stroke.
Area of Science:
- Cardiovascular Genetics
- Neurology
- Epidemiology
Background:
- Ischemic stroke and atrial fibrillation share associations, but causal links and mediating factors require clarification.
- Understanding the network of relationships between ischemic stroke, atrial fibrillation, and their risk factors is crucial for effective intervention.
- Previous research indicates a correlation, but the directionality and mechanisms of causality remain under investigation.
Purpose of the Study:
- To investigate the potential causal association between ischemic stroke and atrial fibrillation.
- To explore potential mediators in the causal pathway from ischemic stroke to atrial fibrillation.
- To elucidate the network of genetic and environmental factors influencing both conditions.
Main Methods:
- A two-sample Mendelian randomization study was conducted using summary statistics from large genome-wide association studies.
- Genetic instruments for ischemic stroke and atrial fibrillation were derived from the ISGC and AFGen Consortium datasets, respectively.
- Network Mendelian randomization framework was employed to assess causal effects and identify mediating pathways, including blood pressure and other biomarkers.
Main Results:
- Blood pressure was identified as a significant mediator in the causal pathway from ischemic stroke to atrial fibrillation.
- Ischemic stroke showed a causal effect on atrial fibrillation (OR, 1.05; P=1.3×10⁻⁵).
- Genetically determined ischemic stroke was associated with increased systolic and diastolic blood pressure, which in turn increased atrial fibrillation risk.
Conclusions:
- Elevated blood pressure in stroke patients significantly increases the risk of developing atrial fibrillation.
- Active management and lowering of blood pressure in ischemic stroke patients may lead to improved clinical outcomes.
- The findings highlight the critical role of blood pressure control in mitigating the risk of atrial fibrillation post-stroke.
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