Sleep duration and heart failure risk: Insights from a Mendelian Randomization Study

Area of Science:

• Cardiovascular Epidemiology
• Genetics
• Sleep Medicine

Background:

• Heart failure (HF) is a major global health concern.
• The causal relationship between sleep duration and HF risk remains incompletely understood.
• Previous studies have shown associations, but causal inference is challenging.

Purpose of the Study:

• To investigate the causal effect of sleep duration on heart failure incidence using a European population.
• To examine the causal impact of insomnia on heart failure risk.
• To leverage genetic data for robust causal inference.

Main Methods:

• Employed a two-sample Mendelian randomization (MR) approach.
• Utilized genome-wide significant single nucleotide polymorphisms (SNPs) associated with continuous sleep duration and insomnia as instrumental variables.
• Analyzed large European cohorts for exposure (sleep duration, insomnia) and outcome (HF) data.

Main Results:

• Genetically inferred shorter sleep duration was causally associated with a reduced risk of heart failure (OR: 0.61, P < .0001).
• Insomnia was causally linked to a significantly increased risk of heart failure (OR: 1.54, P < .02).
• Sensitivity analyses confirmed the robustness of these findings.

Conclusions:

• This study provides evidence for a causal link between sleep duration and heart failure risk in Europeans.
• Shorter sleep duration and insomnia are identified as risk factors for developing heart failure.
• Promoting healthy sleep duration may be a potential strategy for HF prevention.