Full Breakdown
Microplastics Found More Frequently in Coronary Blood of Heart-Attack Patients
7/15/2026, 8:01:18 PM
Study Overview
On 15 July 2026 researchers published a study in the *European Heart Journal* reporting that patients who suffered an acute ST-segment elevation myocardial infarction (STEMI) had markedly higher concentrations of micro- and nanoplastics (MNPs) in the blood supplying the heart than patients with chronic coronary syndrome (CCS) or controls with normal coronary arteries. Blood samples were taken from the coronary circulation and from peripheral sites of 61 individuals undergoing coronary angiography at Sant’Andrea University Hospital (Rome) and Azienda Ospedaliera Universitaria Integrata (Verona).
Research Team & Institutions
The investigation was led by Dr Pasquale Paolisso (first author, Sant’Andrea Hospital, Sapienza University of Rome) and Professor Emanuele Barbato (Director of the Cardiology Unit, Sant’Andrea Hospital, Sapienza University of Rome). Analytical work on MNPs was performed at the Research Centre on Environmental Pollution and Cardiovascular Diseases, University of Campania “Luigi Vanvitelli” (Naples). Co-authors included researchers from the University of Verona and the University of Campania.
Key Findings & Statistics
- MNPs were detected in 84 % of STEMI patients, versus 40 % of CCS patients and 32 % of controls.
- The most prevalent polymer was polyethylene, identified in 97 % of MNP-positive cases.
- All smokers and all individuals exposed to elevated fine-particulate matter (PM2.5 ? 15 µg·m?³) over two years had detectable MNPs, compared with 12.5 % of non-smokers without high pollution exposure.
- Patients with detectable MNPs showed higher serum interleukin-6 and tumour-necrosis-factor-? levels, indicating systemic inflammation.
Health Implications
The authors argue that the association between environmental exposures (smoking, air-pollution, plastic contamination) and elevated coronary MNPs suggests a broader “exposome” risk factor for cardiovascular disease. They propose that policies reducing air-pollution, tobacco use, and plastic release could yield cardiovascular benefits beyond traditional risk-factor control.
Official Statements
Professor Barbato emphasized that the findings “highlight the need to consider micro- and nanoplastic pollution as a broader environmental determinant of health” and called for integrated policies targeting air quality, tobacco exposure, and plastic waste. Dr Paolisso noted that “very little was known about whether these particles are present in the coronary circulation” and that the study adds to growing evidence linking environmental pollutants to heart disease. An accompanying editorial by Professor Andreas Daiber (University Medical Centre, Johannes Gutenberg University, Mainz) described the work as early clinical evidence that “plastic particles can enter the circulation and accumulate in vascular tissues, triggering oxidative stress, inflammation and endothelial dysfunction.”
Criticism & Limitations
Several independent experts cautioned that the study cannot establish causality. Professor Kevin Thomas (University of Queensland) warned that the analytical technique might misidentify endogenous lipids as plastics. Professor Alun Hughes (UCL Institute of Cardiovascular Science) highlighted the lack of control for confounding factors such as socioeconomic status, diet, and possible reverse causation from intravenous infusions administered during acute care. The cross-sectional design and modest sample size (61 participants) were also noted as constraints on the robustness of the conclusions.
Conflicting Reports & Gaps
- Sample size: 61 patients limits statistical power.
- Study design: simultaneous measurement of exposure and outcome precludes temporal inference.
- Potential measurement bias: uncertainty whether all detected particles are synthetic plastics.
- Unmeasured variables: diet, occupational exposure, social deprivation, and blinding of laboratory analysts were not reported.
Verbatim Quotes
- “Micro and nanoplastics are tiny plastic particles that are found virtually everywhere in the environment, including the air we breathe, the water we drink, and many foods we consume. In recent years, scientists have begun to detect these particles in human tissues and organs, raising concerns about their potential health effects” — Dr Pasquale Paolisso, First Author
- “He said: “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.” — Emanuele Barbato, Professor
- “Microplastics are likely to initiate an inflammatory response, as evidenced by raised biochemical inflammation markers in the study.” — Ian Shaw, Emeritus Professor of Toxicology, University of Canterbury
- “It is just as plausible that endogenous lipids [fats] in the blood are being misidentified as plastics,” — Kevin Thomas, Professor and Director, Queensland Alliance for Environmental Health Sciences, University of Queensland
- “The authors have not adequately dealt with confounding or reverse causation as explanations of the association.” — Alun Hughes, Professor of Cardiovascular Physiology and Pharmacology, UCL Institute of Cardiovascular Science
