4.6 Article

Inflammatory bowel disease and cardiovascular disease: A two-sample Mendelian randomization analysis

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FRONTIERS MEDIA SA
DOI: 10.3389/fcvm.2022.927120

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cardiovascular diseases; inflammatory bowel disease; Mendelian randomization; genome-wide association study; causation

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A two-sample Mendelian randomization study found no evidence to support a significant impact of inflammatory bowel disease on cardiovascular disease outcomes. Similar results were observed using various MR analysis methods, with sensitivity analyses demonstrating the robustness of the findings.
BackgroundAlthough epidemiological studies have shown a positive relationship between inflammatory bowel disease (IBD) and risk of cardiovascular disease (CVD) outcomes, a solid causal relationship has not been established. Thus, a two-sample Mendelian randomization (MR) study was conducted to explore the potential causal effect between IBD and CVD outcomes. MethodsWe performed a two-sample MR analysis to analyze the causal effect of the IBD on CVD outcome by using summary-level genome-wide association studies of European descent. The inverse-variance weighted (IVW) method was used as the main MR analysis, with complementary analyses of MR Egger, maximum likelihood, weighted median, penalized weighted media, simple mode, weighted mode, and MR-PRESSO methods. Multiple sensitivity analyses were used to evaluate the robustness of our results. ResultsAll P-values were greater than 0.05 in the IVW method, showing no evidence of a causal association between circulating IBD and CVD. Similar results were observed by using other MR methods. No evidence of heterogeneity, pleiotropy, or outlier single-nucleotide polymorphisms was detected. Sensitivity analyses demonstrated the robustness of the results. ConclusionThe findings of this study provided no evidence to support that IBD has a large effect on risk of CVD outcomes, which is in contrast to many previous observational reports. Further studies are needed to determine the potential mechanism of association identified in observational studies.

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