Background: High blood levels of free myeloperoxidase (MPO) identify patients at risk for cardiovascular disease. We investigated levels of MPO according to 10-year ASCVD risk and the association between high MPO and markers of liver fibrosis and kidney disease. Methods: The study included participants in employer-sponsored annual health assessment (August 2020 to March 2021, n=33,984, 63% women, median age 47, IQR 36 to 56). Age and sex adjusted logistic models assessed the association between high MPO and non-alcoholic fatty liver disease (NAFLD) fibrosis score, liver Fibrosis-4 (FIB4) score, and estimated glomerular filtration rate (eGFR), stratified by 10-year ASCVD risk groups. Results: High MPO (>540 pmol/L) was found in 3% (n =925), 4% (n=184), and 5% (n =63) of the low (<7.5%), intermediate (7.5% to 20%), and high (>20% or prevalent disease) ASCVD risk groups, respectively. High MPO (>540 vs. ≤540 pmol/L) was associated with high NAFLD fibrosis score (>0.676 vs. <-1.455): OR = 4.7, 95%CI 3.5 to 6.2, high FIB4 score (>3.25 vs. ≤3.25): OR =3.4, 95%CI 1.8 to 6.4 and low eGFR (<60 vs. ≥60 mL/min/1.73m 2 ): OR =1.8, 95%CI 1.4 to 2.4. The associations varied according to ASCVD risk (Figure). In the high ASCVD risk group, MPO was not associated with either NAFLD fibrosis score, FIB4 score, or eGFR (P ≥0.2 for all) and the risk differed according to ASCVD risk group (>20% vs. ≤20%) for NAFLD fibrosis score (P int =0.03) and eGFR (P int =0.01). Conclusion: The fraction of those with high MPO did not appreciably differ across ASCVD risk groups and most participants with high MPO levels in this workforce population were in the low ASCVD risk group. This observation is consistent with the hypothesis that subjects in the high ASCVD risk group are more likely to be receiving preventive therapies, whereas guidelines dictate that those in moderate and low risk groups may not. Investigating the association of MPO levels in ASCVD risk groups according to preventive therapy intensity is warranted.
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