The aim of this study was to determine the association of mean platelet volume (MPV) with the development of stroke or coronary artery disease (CAD) in diabetes mellitus (DM). MPV was analyzed in 200 Korean patients with DM. The primary endpoint was composite of ischemic stroke/CAD events. The mean MPV was 7.6 ± 0.8 fl. There were 14 ischemic stroke events and 8 CAD events during a mean of 28.4 months of follow-up. The Kaplan-Meier analysis revealed that the higher tertile MPV group (≥7.9 fl) had a significantly higher stroke/CAD rate compared to the lower tertile MPV group (≤7.3 fl) (29.9% vs. 2.8%, log-rank: p< 0.001). Higher MPV was an independent predictor of stroke/CAD risk after adjusting for 10-year risk ≥10%, hypertension, dyslipidemia, and previous stroke or transient ischemic attack history (hazard ratio: 11.92, 95% confidence interval 2.68-52.92, p = 0.001) in the Cox proportional hazard analysis. When the MPV cut-off level was set to 7.95 fl using the receiver operating characteristic curve, the sensitivity was 91% and the specificity was 80% for differentiating between the group with stroke/CAD and the group without stroke/CAD. This value was more useful in patients with hypertension. The results of this study show that MPV is a predictive marker for stroke/CAD; its predictive power for stroke/CAD is independent of age, gender, hypertension, and hemoglobin A1C.

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It might be considered that lovastatin resulted in reducing the first-pass metabolism in the intestine and/or in the liver via inhibition of CYP3A4 and increasing the absorption of diltiazem in the intestine via inhibition of P-gp by lovastatin.

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