Sleep duration and cardiovascular disease causal association: A two-sample Mendelian randomization study.

Area of Science:

• Cardiovascular Health
• Sleep Medicine
• Genetics

Background:

• Emerging research suggests a link between sleep duration and cardiovascular disease (CVD).
• Previous studies have not specifically investigated this correlation.
• Understanding this relationship is crucial for public health.

Purpose of the Study:

• To investigate the correlation between sleep duration and cardiovascular disease (CVD).
• To determine if sleep duration directly impacts the risk of developing CVD.
• To analyze the association between both over-sleeping and under-sleeping with various cardiovascular conditions.

Main Methods:

• Utilized summary data from genome-wide association studies (GWAS) across diverse populations.
• Employed two-sample Mendelian randomization (MR) to assess causal relationships.
• Applied inverse variance weighting (IVW) as the primary analysis method, supplemented by MR-Egger regression, weighted median, and weighted mode for robustness.

Main Results:

• Over-sleeping showed significant negative correlations with valvular heart disease, myocardial infarction, and heart failure (P < 0.05).
• Under-sleeping demonstrated significant positive correlations with non-ischemic cardiomyopathy, cardiac arrhythmias, valvular heart disease, and atrial fibrillation (P < 0.05).
• No significant correlations were found for other investigated cardiovascular conditions.

Conclusions:

• Sleep duration is correlated with specific cardiovascular diseases.
• Over-sleeping may have a protective effect against certain CVDs.
• Under-sleeping appears to increase the risk for other CVDs, highlighting the importance of adequate sleep for cardiovascular health.