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Circulating Microplastics in Peripheral Blood and the Tobacco-AMI-MPs Axis: A Pilot Screening in Patients with Myocardial Infarction and Healthy Controls
Summary
Scientists found tiny plastic particles (microplastics) in the blood of both heart attack patients and healthy people, using a new testing method—though this small pilot study wasn't large enough to prove a clear link between microplastics and heart attacks. Interestingly, smokers had different types of plastic in their blood than non-smokers, matching materials found in cigarette packaging and filters, suggesting smoking may be a direct source of plastic exposure. This early-stage research shows the testing method works well and paves the way for larger studies to better understand how plastic pollution in our bodies might affect heart health.
The presence of circulating microplastics (MPs) in human blood represents an emerging concern with potential cardiovascular implications. This pilot study evaluated a digestion-filtration protocol using confocal Raman microscopy to screen circulating MPs in healthy controls (N=8) and acute myocardial infarction (AMI) patients (N=6). The protocol effectively removed biogenic matter from blood filters, enabling reliable Raman measurements. MPs were detected in both groups, showing a descriptive prevalence of 50.0% (3/6) in AMI patients compared to 37.5% (3/8) in controls (Odds Ratio [OR] = 1.67, p = 1.000). At the particle level, positive particles accounted for 8.3% (5/60) in AMI patients and 10.0% (6/60) in controls (OR = 0.82, p = 1.000). Active smoking was associated with a significant qualitative polymer shift: active smokers exclusively carried polystyrene and ethylene-vinyl acetate—key components of cigarette packaging and filters—while non-active subjects carried baseline polyethylene and polypropylene (Fisher's p = 0.002; Chi-Square p = 0.012). No significant associations were found with age or sex. These findings support the viability of this methodology for larger clinical cohorts investigating circulating microplastics in cardiovascular health.