Study: Microplastics in Blood Linked to Severe Heart Attacks

Italian researchers have detected microplastics in the coronary blood of 84% of patients suffering from ST-segment elevation myocardial infarction (STEMI), one of the most severe forms of heart attack. The study, led by Emanuele Barbato of Sapienza University of Rome, found that only 32% of participants with healthy coronary arteries had detectable plastic particles in their blood.

The findings, reported by the National Pulse, measured microplastics directly in blood flowing to the heart rather than in arterial plaque, providing a separate line of inquiry from earlier research. Polyethylene, a plastic commonly used in packaging, was the most frequently identified material.

What did the study measure?

STEMI occurs when a coronary artery is suddenly blocked, cutting off blood flow to the heart muscle and requiring immediate emergency treatment. Researchers analyzed blood samples drawn from the coronary arteries of patients undergoing angiography.

Patients with detectable microplastics also exhibited higher levels of inflammatory markers linked to plaque instability and heart attacks. This aligns with earlier research showing that the presence of microplastics and nanoplastics in arterial plaques was associated with increased inflammation, as noted in the Trends-Journal.

Nanoplastics, because of their small size, can migrate from the digestive tract or lungs into the bloodstream and reach cells and tissues in major organs, according to the Trends-Journal analysis.

What risk factors did researchers identify?

The study identified cigarette smoking and long-term exposure to fine particulate air pollution as independent factors associated with the presence of microplastics in the bloodstream. Barbato stated, “Smoking may act as both a source of toxins and a pathway for plastics to reach the blood,” as reported by the National Pulse. Researchers suggested that damaged lung tissue may allow particles to enter circulation more easily.

A separate study on microplastics in arteries found these particles embedded in human arterial plaque at levels 51 times higher in patients who had experienced strokes or heart attacks, indicating that respiratory exposure pathways are a likely route of entry.

How do experts interpret the findings?

Dr. Joyce Oen-Hsiao, a cardiologist at Yale Medicine, commented on the findings: “This adds to the evidence that microplastics can lead to localized inflammatory reactions, which can raise the risk of heart attack due to plaque rupture,” according to Everyday Health.

Experts not involved in the study told reporters that the findings add to growing evidence that environmental pollutants may contribute to cardiovascular disease, but stressed that the research does not prove microplastics directly cause heart attacks. They noted that the observational nature of the study cannot establish causation and that further research is needed to confirm the relationship.

How does this relate to prior research?

A prior study published in 2024 found that patients with microplastics in arterial plaque faced a substantially elevated risk of heart attack, stroke, and early death. The new Italian study measured microplastics directly in blood flowing to the heart, not in plaque, providing a complementary line of inquiry into how these particles interact with the cardiovascular system.

What are the next steps?

The study authors said further research is needed to establish causality and assess long-term risks. The research also underscores the importance of reducing exposure to microplastics, which are pervasive in food, water, and air.

For individuals looking to lower their exposure, experts recommend avoiding plastic food containers, especially when heating, and using filtered tap water instead of bottled water, as bottled water has been shown to contain microplastic particles. Ongoing research continues to investigate the health effects of these widespread contaminants.

FAQ

What did the Italian microplastics heart attack study find?

Researchers detected microplastics in the coronary blood of 84% of STEMI heart attack patients, compared with 32% of participants with healthy coronary arteries. Polyethylene was the most frequently identified material.

Who led the microplastics and STEMI research?

The study was led by Emanuele Barbato of Sapienza University of Rome and analyzed blood samples from patients undergoing coronary angiography.

Can microplastics cause heart attacks?

The study does not prove causation. Experts stressed that the observational design cannot establish that microplastics directly cause heart attacks, and further research is needed to confirm the relationship.