Causal relationship between COVID-19 and myocarditis or pericarditis risk: a bidirectional Mendelian randomization...

Area of Science:

• Cardiovascular Medicine
• Infectious Diseases
• Genetics

Background:

• Observational studies suggest a link between COVID-19 and myocarditis/pericarditis.
• The causal relationship between COVID-19 and these cardiac conditions remains uncertain.
• Previous research presents conflicting evidence regarding COVID-19's impact on cardiac health.

Purpose of the Study:

• To investigate the causal relationship between COVID-19 infection and myocarditis or pericarditis.
• To differentiate between association and causation using a bidirectional Mendelian randomization approach.
• To analyze severe, hospitalized, and general COVID-19 infection in relation to cardiac outcomes.

Main Methods:

• Bidirectional Mendelian randomization (MR) study design.
• Utilized genome-wide association statistics for COVID-19 (severe, hospitalized, infection) and cardiac conditions (myocarditis, pericarditis) in European ancestry populations.
• Employed inverse-variance weighted (IVW) method and sensitivity analyses (MR-Egger, MR-PRESSO, heterogeneity tests) to assess causality and rule out pleiotropy.

Main Results:

• No significant causal association was found between COVID-19 infection and myocarditis or pericarditis using IVW and sensitivity analyses.
• Severe COVID-19 showed no association with myocarditis (OR=1.00) or pericarditis (OR=0.90).
• Reverse analyses (cardiac conditions influencing COVID-19) also yielded null associations, with results remaining stable across sensitivity tests.

Conclusions:

• This study provides no evidence for an independent causal link between COVID-19 and myocarditis or pericarditis.
• The findings suggest that observed associations in observational studies may not reflect direct causation.
• Further research may be needed to understand the complex interplay between viral infections and cardiac inflammation.