A Causal Association Between Atrial Fibrillation and Depression: Evidence From Mendelian Randomization Analyses.
ZhiFei Sun, XiaoDing Wang, QingHe Zhao et al.
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In 30 seconds
This two-sample Mendelian randomization study examined whether atrial fibrillation (AF) is causally associated with depression, using genetic data from separate AF and depression genome-wide association studies and a meta-analysis of results from two depression datasets. Genetically predicted AF was associated with increased depression risk, with a combined odds ratio of 29.19 (95% CI = 4.43-192.13, P < 0.001). Results were consistent across sensitivity analyses, and MR-Egger analysis detected no evidence of gene pleiotropy. The findings support a causal association within the assumptions of the Mendelian randomization approach.
Key findings
- Genetically predicted AF was associated with higher depression risk: combined odds ratio 29.19 (95% CI = 4.43-192.13, P < 0.001).
- The association was identified using 15 single nucleotide polymorphisms as markers.
- Alternative Mendelian randomization sensitivity analyses produced consistent results; MR-Egger detected no evidence of gene pleiotropy.
Why it matters
The findings suggest that AF may have implications beyond cardiovascular outcomes, with a potential causal link to depression. This supports attention to mental health in research on AF and highlights the value of considering psychological outcomes alongside cardiac disease. The estimate is based on genetic instruments and should be interpreted within the assumptions of Mendelian randomization.
What to keep in mind
The study relies on Mendelian randomization assumptions and genetic instruments; the abstract does not report clinical follow-up or direct assessment of depression after AF.