A groundbreaking study published in the European Heart Journal reveals that people who suffer heart attacks have substantially higher levels of micro and nanoplastics circulating in their blood. Researchers measured plastic particles in the blood supplying the heart and found the highest concentrations in heart attack patients, compared to those with chronic heart disease or normal blood vessels. The findings suggest that environmental pollution, including plastic contamination, may represent a previously underestimated risk factor for cardiovascular disease.

What Are Micro and Nanoplastics, and Where Do They Come From?

Micro and nanoplastics are tiny plastic particles found virtually everywhere in our environment. Microplastics measure less than 5 millimeters, while nanoplastics are even smaller, measuring less than 1 micrometer. These particles originate from the breakdown of larger plastic items and are present in the air we breathe, the water we drink, and many foods we consume. The most common type detected in heart attack patients was polyethylene, a plastic widely used in packaging and consumer products.

The research, conducted by scientists at Sapienza University of Rome, University of Verona, and the Research Centre on Environmental Pollution and Cardiovascular Diseases at the University of Campania "Luigi Vanvitelli" in Naples, Italy, examined 61 patients diagnosed with either a heart attack, chronic ischemic heart disease, or normal coronary arteries. Researchers took blood samples directly from the arteries supplying the heart and from other parts of the body, then analyzed them for plastic particles.

How Strong Is the Connection Between Plastics and Heart Attacks?

The study's findings were striking. Among patients who had suffered a heart attack, micro and nanoplastics were detected in 84% of cases, compared with 40% of patients with chronic ischemic heart disease and 32% of patients with normal coronary arteries. Heart attack patients also had a greater variety of plastic types in their blood, suggesting a more significant exposure burden.

Two major environmental factors emerged as strong predictors of plastic accumulation in the blood. Smokers were six times more likely to have microplastics in their blood compared to non-smokers. Additionally, patients exposed to higher long-term levels of air pollution, specifically particles measuring 2.5 micrometers or less in diameter (known as PM2.5), were more likely to have microplastics in their blood. Remarkably, all patients who both smoked and were exposed to higher air pollution levels had plastics in their blood, compared with only 12.5% of patients who neither smoked nor were exposed to elevated pollution levels.

How Do Plastics Enter the Bloodstream?

Researchers believe that smoking and air pollution may create pathways for plastic particles to enter the circulatory system. According to the study's lead researcher, Dr. Pasquale Paolisso from Sant'Andrea Hospital at Sapienza University of Rome, the mechanism likely involves the lungs.

"Our findings suggest that smoking might make it easier for micro and nanoplastics to enter the blood stream via the lungs. Air pollution may act in a similar way," said Dr. Pasquale Paolisso.

Dr. Pasquale Paolisso, First Author, Sant'Andrea Hospital, Sapienza University of Rome

Once in the bloodstream, these particles may trigger inflammation and oxidative stress, damaging the delicate inner lining of blood vessels. The study found elevated inflammatory markers, including tumor necrosis factor-alpha and interleukin-6, in patients with higher plastic exposure, suggesting a link between plastic particles and systemic inflammation.

Steps to Reduce Your Exposure to Microplastics

• Minimize Air Pollution Exposure: Limit outdoor activities on high air pollution days, use air quality apps to monitor PM2.5 levels in your area, and consider using air purifiers with HEPA filters in your home.
• Quit Smoking: Smoking was the strongest individual risk factor for microplastic accumulation in the blood. Quitting eliminates this major pathway for plastic particles to enter your lungs and bloodstream.
• Reduce Plastic Consumption: Choose products with minimal plastic packaging, avoid single-use plastics, and opt for glass, metal, or paper alternatives when possible to reduce overall plastic pollution in the environment.
• Support Environmental Policies: Advocate for regulations that reduce air pollution, limit tobacco exposure, and address plastic contamination in your community and at the policy level.

Professor Emanuele Barbato, who led the research, emphasized the broader implications of the findings. While the study does not prove that microplastics directly cause heart attacks, it reveals a strong association between environmental exposures, plastic accumulation in the blood, and cardiovascular disease.

"These findings do not prove that microplastics cause heart attacks, but they reveal a strong association between environmental exposures, microplastics in the blood and cardiovascular disease. The results highlight the need to consider microplastic pollution as part of the broader environmental determinants of health," explained Professor Emanuele Barbato.

Professor Emanuele Barbato, Director of the Cardiology Unit, Sant'Andrea University Hospital, Rome

An accompanying editorial in the European Heart Journal noted that plastic particles can enter the circulation and accumulate in vascular tissues, triggering key mechanisms of vascular injury including oxidative stress, inflammation, and endothelial dysfunction. The editorial called for coordinated efforts across disciplines and policy domains to address plastic pollution as an emerging cardiovascular risk factor.

The implications extend beyond individual behavior. Policies that reduce air pollution, tobacco exposure, and environmental plastic contamination could have benefits that extend beyond environmental protection and potentially improve cardiovascular health for entire populations. As plastic pollution continues to accumulate in our environment, understanding its cardiovascular effects becomes increasingly urgent for public health planning and disease prevention strategies.