Relationship between rheumatoid arthritis and cardiovascular comorbidity, causation or co-occurrence: A Mendelian...

Area of Science:

• Genetics and Epidemiology
• Cardiovascular Medicine
• Rheumatology

Background:

• Rising global incidence of rheumatoid arthritis (RA) and heart disease (HD).
• Established association between RA and increased HD risk, with underlying causality unclear.
• Need for genetic investigation into the RA-HD relationship.

Purpose of the Study:

• To investigate the potential causal association between rheumatoid arthritis (RA) and heart disease (HD) using Mendelian randomization.
• To determine if genetic predisposition to RA influences the risk of specific cardiovascular conditions.

Main Methods:

• Utilized genome-wide association study (GWAS) data for RA, ischemic heart disease (IHD), myocardial infarction (MI), atrial fibrillation (AF), and arrhythmia.
• Employed the inverse-variance weighted (IVW) method for Mendelian randomization (MR) analysis.
• Conducted sensitivity analyses to assess heterogeneity, horizontal pleiotropy, and reverse causality.

Main Results:

• Genetic susceptibility to RA was significantly associated with increased risk of IHD (OR 1.0006, P=0.001552) and MI (OR 1.0458, P=0.001636).
• No significant association was found between RA and the risk of AF or arrhythmia.
• Sensitivity analyses confirmed the primary findings and indicated no significant heterogeneity, pleiotropy, or reverse causality.

Conclusions:

• Rheumatoid arthritis (RA) is causally associated with an elevated risk of ischemic heart disease (IHD) and myocardial infarction (MI).
• The study provides a potential genetic basis for the causal link between RA and cardiovascular disease (CVD).
• Effective management of RA activity may be crucial in mitigating cardiovascular disease risk.