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Inflammatory bowel disease and cardiovascular disease: A two-sample Mendelian randomization analysis
Kaiwen Wu1, Aoshuang Li1, Lei Liu2
1Department of Gastroenterology, The Third People's Hospital of Chengdu, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan, China.
Frontiers in Cardiovascular Medicine
|September 19, 2022
Summary
This study found no causal link between inflammatory bowel disease (IBD) and cardiovascular disease (CVD) risk. Mendelian randomization analysis did not support a significant association, contrasting with some observational findings.
Area of Science:
- Genetics
- Epidemiology
- Cardiovascular Health
Background:
- Observational studies suggest a link between inflammatory bowel disease (IBD) and cardiovascular disease (CVD) risk.
- However, a definitive causal relationship between IBD and CVD outcomes remains unestablished.
- This necessitates rigorous investigation into the potential causal pathways.
Purpose of the Study:
- To investigate the potential causal effect of inflammatory bowel disease (IBD) on cardiovascular disease (CVD) outcomes.
- To utilize a two-sample Mendelian randomization (MR) approach for robust causal inference.
- To clarify the etiological relationship between IBD and CVD.
Main Methods:
- A two-sample Mendelian randomization (MR) study was conducted using summary-level genome-wide association studies (GWAS) data from European populations.
- The inverse-variance weighted (IVW) method served as the primary analysis, complemented by MR Egger, weighted median, and MR-PRESSO.
- Extensive sensitivity analyses were performed to ensure the reliability and robustness of the findings.
Main Results:
- The primary IVW analysis revealed no statistically significant causal association between inflammatory bowel disease (IBD) and cardiovascular disease (CVD) outcomes (all P > 0.05).
- Complementary MR methods corroborated these findings, indicating a lack of causal effect.
- Sensitivity analyses detected no significant heterogeneity, pleiotropy, or outlier genetic variants, supporting the robustness of the results.
Conclusions:
- This Mendelian randomization study provides no evidence for a substantial causal effect of inflammatory bowel disease (IBD) on cardiovascular disease (CVD) risk.
- The findings contrast with previous observational reports, suggesting potential confounding factors or unmeasured biases in those studies.
- Further research is warranted to elucidate the mechanisms underlying the observed associations in epidemiological studies.
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