The short version
- 61 patients had blood drawn from coronary arteries during angiograms.
- Detectable micro- and nanoplastics appeared in 84 % of those suffering an acute heart attack.
- The same particles were found in 40 % of chronic heart-disease patients and 32 % of patients with normal arteries.
- Polyethylene accounted for 97 % of the positive samples.
- The study was led by Dr. Raffaele Marfella of the University of Campania Luigi Vanvitelli, Italy, and published in the European Heart Journal.
What the researchers observed
Researchers collected arterial blood from patients undergoing coronary-artery imaging. The cohort comprised 61 individuals split into three groups: those experiencing an acute myocardial infarction, patients with stable coronary disease, and subjects whose arteries appeared normal. Laboratory analysis searched for tiny plastic fragments, commonly called micro- and nanoplastics. The results showed a clear split, 84 % of the acute-MI group contained detectable particles, while only 40 % of the chronic-disease group and 32 % of the normal-artery group did. Among the positive samples, polyethylene, the polymer found in many plastic bags and bottles, was present in 97 %.
Plain-language background
A heart attack, medically known as an acute myocardial infarction, occurs when a coronary artery becomes suddenly blocked, starving heart muscle of oxygen. Chronic heart disease describes long-standing conditions like stable angina, where arteries are narrowed but not acutely blocked. Microplastics are minuscule fragments of plastic, usually smaller than five millimetres, that can enter the bloodstream through food, drink, or inhalation. Nanoplastics are even smaller, often under one-hundred nanometres, and can cross cellular membranes. An angiogram is a procedure that injects contrast dye into coronary vessels so doctors can see blockages; the same catheter can draw blood directly from the artery for laboratory testing.
How microplastics might matter
The presence of plastic particles in coronary blood raises questions about how they could influence heart health. One proposed pathway is inflammation: foreign particles circulating in the bloodstream may trigger immune responses, potentially aggravating arterial wall injury. Another idea involves oxidative stress, where tiny plastics generate reactive molecules that damage cells lining blood vessels. While the study did not test these mechanisms directly, the high detection rate in acute-MI patients suggests a possible link worth exploring.
Why the finding draws attention
Cardiovascular disease remains the leading cause of death worldwide, affecting millions each year. If environmental contaminants like microplastics contribute even modestly to heart-attack risk, the public-health impact would be hard to ignore. The study’s authors highlighted smoking history as the strongest predictor of detectable plastics, hinting at overlapping risk factors. And because polyethylene dominates plastic waste, the result shows how everyday items, from grocery bags to beverage bottles, might end up inside our circulatory system.
The catch
The authors and independent commentators stressed that the study is observational. It cannot prove that plastics cause heart attacks; it only shows an association. The sample size is modest, 61 patients, all recruited from a single Italian centre, limiting the ability to generalise the findings globally. Smoking and other environmental exposures, such as air pollution, also correlate with both cardiovascular disease and higher plastic burdens, making it difficult to isolate the effect of microplastics alone.
What to watch next
Future work will need larger, multi-centre cohorts to confirm the prevalence of microplastics across diverse populations. Laboratory studies may probe whether plastic particles can directly provoke inflammation or endothelial dysfunction. Long-term follow-up of individuals with measured plastic exposure could clarify whether higher levels predict future cardiac events. If subsequent research establishes a causal link, regulatory agencies might consider tighter controls on plastic usage in food-contact materials.
Study details at a glance
| Patient group | Detection rate |
|---|---|
| Acute myocardial infarction | 84 % |
| Chronic coronary disease | 40 % |
| Normal coronary arteries | 32 % |
How much to make of it
The leap from “plastic particles appear in blood” to “plastics cause heart attacks” is not yet supported by evidence. The observed percentages describe who had detectable particles, not how much exposure increased risk. The study’s design cannot rule out that other factors, like smoking, which the authors identified as the strongest predictor, might explain the higher detection rates. So the results should be viewed as an early signal rather than definitive proof of harm.
Sources:
- Paolisso P, Marfella R, Barbato E, et al. “Micro- and nano-plastics in the coronary circulation and air pollution exposure in ischaemic heart disease presentation,” European Heart Journal, 14 July 2026. DOI: 10.1093/eurheartj/ehag447 (https://academic.oup.com/eurheartj/advance-article-abstract/doi/10.1093/eurheartj/ehag447/8725569)
- European Society of Cardiology, “Patients who suffer heart attack have more micro and nanoplastic in their blood” (https://www.escardio.org/news/press/press-releases/patients-who-suffer-heart-attack-have-more-micro-and-nanoplastic-in-their-blood/)
- Fox News Digital, “Microplastics detected in most heart-attack patients’ blood in startling new study” (https://www.foxnews.com/health/microplastics-detected-most-heart-attack-patients-blood-startling-new-study)
Disclaimer: This article is for general information only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about any medical condition or before making health decisions.