Exploring the Relationship Between Schizophrenia and Cardiovascular Disease: A Genetic Correlation and Multivariable...

Area of Science:

• Psychiatric Genetics
• Cardiovascular Epidemiology
• Biostatistics

Background:

• Individuals with schizophrenia exhibit reduced life expectancy, primarily due to increased cardiovascular disease (CVD) risk.
• The precise nature of the relationship between schizophrenia and CVD remains unclear.
• Genetic studies are essential for elucidating complex disease associations.

Purpose of the Study:

• To investigate the causal relationship between schizophrenia and various cardiovascular diseases using genetic data.
• To explore potential mediating factors, including body mass index (BMI), lipids, and type 2 diabetes, in the schizophrenia-CVD link.

Main Methods:

• Genome-wide association study (GWAS) summary statistics for schizophrenia and multiple cardiovascular traits were analyzed.
• Genetic correlations and bi-directional Mendelian randomization (MR) were employed to assess causality.
• Multivariable MR was used to investigate mediation pathways.

Main Results:

• Genetic correlations between schizophrenia and CVD were near zero, suggesting limited shared genetic architecture.
• Evidence indicated that schizophrenia liability causally increases the risk of heart failure, independent of common genetic factors.
• Schizophrenia liability was also linked to increased early repolarization patterns, mediated by BMI and lipids, and altered heart rate variability.

Conclusions:

• Schizophrenia liability appears to causally increase heart failure risk, consistent with systemic dysregulation.
• The findings highlight the importance of addressing cardiovascular health in schizophrenia management.
• Prioritizing optimal early psychosis treatment is crucial for reducing cardiovascular mortality in individuals with schizophrenia.