Long-Term Exposure to Fine Particulate Constituents and Vascular Damage in a Population with Metabolic Abnormality in China

Abstract

Aim: To date, PM2.5-associated vascular damage in metabolic abnormalities has remained controversial. We knew little about the vascular damage of PM2.5 constituents. Thus, this study aimed to investigate the relationship between long-term exposure to PM2.5 and its constituents and vascular damage in metabolic abnormalities. Methods: A total of 124,387 participants with metabolic abnormalities (defined as at least one metabolic disorder, such as obesity, elevated blood pressure, elevated triglyceride level, elevated fasting glucose level, or low HDL cholesterol level) were recruited in this study from 11 representative centers in China between January 2011 and December 2017. PM2.5 and its constituents (black carbon [BC], organic matter [OM], sulfate [SO4 2− ], nitrate [NO3 − ], and ammonium salts [NH4 ＋ ]) were extracted. Elevated brachial-ankle pulse wave velocity (baPWV) (≥ 1,400 cm/s) and declined ankle-brachial index (ABI) (＜0.9) indicated vascular damage. Multivariable logistic regression and Quantile g-Computation models were utilized to explore the impact on outcomes.Results: Of the 124,387 participants (median age, 49 years), 87,870 (70.64%) were men. One-year lag exposure to PM2.5 and its constituents was significantly associated with vascular damage in single pollutant models. The adjusted odds ratios (OR) for each 1-μg/m 3 increase in PM2.5 was 1.013 (95% CI, 1.012-1.015) and 1.031 (95% CI, 1.025-1.037) for elevated baPWV and decreased ABI, respectively. PM2.5 constituents were also associated with vascular damage in multi-pollutant models. Among the PM2.5 constituents, BC (47.17%), SO4 2− (33.59%), and NH4 ＋ (19.23%) have the highest contribution to elevated baPWV and NO3 − (47.89%) and BC (23.50%) to declined ABI. Conclusion:Chronic exposure to PM2.5 and PM2.5 constituents was related to vascular damage in the abnormal metabolic population in China. The heterogeneous contribution of different PM2.5 constituents to vessel bed damage is worthy of attention when developing targeted strategies.

Which Components of Fine Particulate Matter Have Adverse Vascular Health?

“…In this issue of the Journal of Atherosclerosis and Thrombosis, Lin et al cross-sectionally analyzed data of 124,387 participants with metabolic abnormalities in China, and observed the association between the 1-year average total mass concentration of PM2.5 and subclinical atherosclerotic parameters, including brachial-ankle pulse wave velocity (baPWV) and ankle-brachial index (ABI) 3) . The findings demonstrated a consistent pattern that total mass concentration of PM2.5 is likely to be a risk factor for atherosclerosis 4) .…”