Prognostic value of platelet indices after acute myocardial infarction treated with primary percutaneous coronary intervention.

BACKGROUND Mean platelet volume (MPV) is a strong predictor of impaired angiographic reperfusion and 6-month mortality in ST-elevation myocardial infarction (MI) treated with primary percutaneous coronary intervention (PCI). No data is available for other platelet volume indices: platelet distribution width (PDW) and platelet large cell ratio (P-LCR). The aim was to assess the impact of 3 platelet volume indices on long-term prognosis in patients treated with primary PCI in acute MI. METHODS This prospective study enrolled 538 patients who underwent primary PCI in acute MI. Admission blood samples were measured for MPV, PDW, and P-LCR. The patients were followed-up a mean period of 26 ± 11 months with regard to cardiac death, non-fatal reinfarction, re-PCI or coronary artery bypass grafting. RESULTS Kaplan-Meier survival analysis showed a significantly higher 26-month mortalityrate in patients with high MPV (≥ 11.7 fL) than in those with low MPV (< 11.7 fL) (14.6% vs. 5.5%, p = 0.0008). Similar findings were related to high P-LCR (≥ 38.1%) vs. low P-LCR (< 38.1%) - mortality 13.8% vs. 5.8%, p = 0.0025. Higher PDW values (≥ 16 fL) correlated with higher mortality rate as compared to PDW < 16 fL (17.4% vs. 6.3%, p = 0.0012). PDW was found to be an independent prognostic factor for cardiac mortality and composite endpoint. CONCLUSIONS Mean platelet volume, platelet distribution width and platelet large cell ratio measured on admission are strong, independent prognostic factors in PCI-treated acute MI.