Chronic Stress Linked to Hidden Heart Inflammation Risk

Chronic stress may significantly affect heart health by driving hidden inflammation, according to a comprehensive study conducted in the United Kingdom. The research, published in the European Journal of Preventive Cardiology, investigated the relationship between chronic inflammation and cardiovascular conditions. Chronic inflammation, which is a long-term immune response, is associated with various diseases, including those of the heart.

The study involved the analysis of health data from 480,000 participants in the UK Biobank. Researchers from the MRC Laboratory of Medical Sciences and Imperial College London combined blood tests measuring glycoprotein acetyls (GlycA)—a marker for inflammation—with genetic data and heart imaging.

The findings revealed that individuals in the highest inflammation group exhibited a 43% greater risk of experiencing major cardiovascular events, such as heart attacks and strokes, compared to those in the lowest group. Moreover, these individuals displayed significant structural changes in the heart, including thicker heart walls, reduced chamber sizes, and impaired filling capacity. These alterations may progress without noticeable symptoms.

The researchers noted a correlation between elevated inflammation levels and factors such as socioeconomic disadvantages, psychological distress, and established cardiovascular risks, including smoking and obesity. This suggests a link between inflammation and broader social conditions and mental health.

Specifically, inflammatory proteins from the interleukin-1 and tumour necrosis factor (TNF) families were identified as potential contributors to structural heart changes. Some of these proteins are currently the focus of clinical trials aimed at developing anti-inflammatory treatments that could help prevent cardiovascular diseases.

The study also indicated that genetic variations may affect an individual's susceptibility to inflammation-related heart damage. However, researchers emphasised that genetic predisposition does not guarantee the development of heart disease.

As the study is observational, it does not establish a direct causal relationship between inflammation and heart damage or cardiovascular events. Further research is necessary to ascertain whether mitigating inflammation or targeting specific pathways can effectively prevent such diseases.

The results underscore the potential for using inflammation as an early marker of cardiovascular risk. Furthermore, they support public health initiatives aimed at reducing smoking, promoting weight management, improving mental health, and addressing socioeconomic factors that can affect health outcomes. Researchers consider this study to be the largest of its kind, with higher inflammation levels linked to cardiovascular risk, indicating that detrimental changes may begin before any clinical symptoms arise.