Microplastics and Nanoplastics in Atheromas and Cardiovascular Events

By R. Marfella, F. Prattichizzo, C. Sardu, Gianluca Fulgenzi, Laura Graciotti, Tatiana Spadoni, N. D’Onofrio, L. Scisciola, Rosalba La Grotta, Chiara Frigé and 33 more. New England Journal of Medicine, 2024

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BACKGROUND Microplastics and nanoplastics (MNPs) are emerging as a potential risk factor for cardiovascular disease in preclinical studies. Direct evidence that this risk extends to humans is lacking. METHODS We conducted a prospective, multicenter, observational study involving patients who were undergoing carotid endarterectomy for asymptomatic carotid artery disease. The excised carotid plaque specimens were analyzed for the presence of MNPs with the use of pyrolysis–gas chromatography–mass spectrometry, stable isotope analysis, and electron microscopy. Inflammatory biomarkers were assessed with enzyme-linked immunosorbent assay and immunohistochemical assay. The primary end point was a composite of myocardial infarction, stroke, or death from any cause among patients who had evidence of MNPs in plaque as compared with patients with plaque that showed no evidence of MNPs. RESULTS A total of 304 patients were enrolled in the study, and 257 completed a mean (±SD) follow-up of 33.7±6.9 months. Polyethylene was detected in carotid artery plaque of 150 patients (58.4%), with a mean level of 21.7±24.5 μg per milligram of plaque; 31 patients (12.1%) also had measurable amounts of polyvinyl chloride, with a mean level of 5.2±2.4 μg per milligram of plaque. Electron microscopy revealed visible, jagged-edged foreign particles among plaque macrophages and scattered in the external debris. Radiographic examination showed that some of these particles included chlorine. Patients in whom MNPs were detected within the atheroma were at higher risk for a primary end-point event than those in whom these substances were not detected (hazard ratio, 4.53; 95% confidence interval, 2.00 to 10.27; P<0.001). CONCLUSIONS In this study, patients with carotid artery plaque in which MNPs were detected had a higher risk of a composite of myocardial infarction, stroke, or death from any cause at 34 months of follow-up than those in whom MNPs were not detected. (Funded by Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale and others; ClinicalTrials.gov number, NCT05900947.)

Subfields: Biomaterials, Health, Toxicology and Mutagenesis, Pollution

View Paper: https://www.semanticscholar.org/paper/4b5e66f1118845c5c045632ff29440f4d5ad78c1

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Citations in the corpus

Twenty years of microplastic pollution research—what have we learned? (2024, background): “Such approaches may also be influenced by recent reports on the potential for an association be-tween microplastics and various diseases, including cardiovascular disease ( 112 ).”
Bioaccumulation of microplastics in decedent human brains (2025, positive): “…pathologist (D.F.G.) who selected consistent regions pyrolysis gas chromatography–mass spectrometry (Py-GC/MS) has been applied to blood 9 , placentas 10 and recently major blood vessels 3,4 in a manner that appears more cumulative, quantitative and less biased when coupled with orthogonal methods.”