Key result
Genetically predicted shift work linked to ~62% higher risk of unstable angina.
Why the study?
Environmental and occupational factors like air pollution, noise, and shift work are increasingly recognized as potential contributors to cardiovascular disease, but their causal relationships with unstable angina and myocardial infarction remain to be clarified.
Does shift work, air pollution, or noise causally increase the risk of unstable angina and myocardial infarction in adults?
Does shift work, air pollution, or noise causally increase the risk of unstable angina and myocardial infarction in adults?
This Mendelian randomization study provides genetic evidence that shift work is a causal risk factor for unstable angina and myocardial infarction, underscoring the cardiovascular hazards of irregular work schedules.
Answers are grounded in this paper and cite their sources.
May support shift work counseling in at-risk adults; extends MR evidence on occupational risks but leaves intervention trials needed.
Cardiovascular disease continues to be a major contributor to global morbidity and mortality, with environmental and occupational factors such as air pollution, noise, and shift work increasingly recognized as potential contributors. Using a two-sample Mendelian randomization (MR) approach, this study investigates the causal relationships of these risk factors with the risks of unstable angina (UA) and myocardial infarction (MI). Leveraging single nucleotide polymorphisms (SNPs) as genetic instruments, a comprehensive MR study was used to assess the causal influence of four major air pollutants (PM2.5, PM10, NO2, and NOx), noise, and shift work on unstable angina and myocardial infarction. Summary statistics were derived from large genome-wide association studies (GWASs) from the UK Biobank and the FinnGen consortium (Helsinki, Finland), with replication using an independent GWAS data source for myocardial infarction. The inverse-variance weighted (IVW) approach demonstrated a significant positive correlation between shift work and the increased risk of both unstable angina (OR with 95% CI: 1.62 [1.12–2.33], p = 0.010) and myocardial infarction (OR with 95% CI: 1.46 [1.00–2.14], p = 0.052). MR-PRESSO analysis identified outliers, and after correction, the association between shift work and myocardial infarction strengthened (OR with 95% CI: 1.58 [1.11–2.27], p = 0.017). No notable causal associations were identified for air pollution or noise with either outcome. The replication of myocardial infarction findings using independent data supported a possible causal link between shift work and myocardial infarction (OR with 95% CI: 1.41 [1.08–1.84], p = 0.012). These results provide novel evidence supporting shift work as a likely causal risk factor for unstable angina and myocardial infarction, underscoring the need for targeted public health strategies to mitigate its cardiovascular impact. However, further investigation is necessary to elucidate the role of air pollution and noise in cardiovascular outcomes.
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Ma et al. (2024) studied Unstable angina and myocardial infarction. Shift work vs. No shift work was evaluated on Unstable angina (OR 1.62, 95% CI 1.12-2.33, p=0.010). Genetically predicted shift work was significantly associated with an increased risk of unstable angina (OR 1.62) and myocardial infarction.
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