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The aim of this study was to investigate the antiplatelet effects of eicosapentaenoic acid (EPA) at a sufficient dose following coronary stent implantation. Thirty-one patients on dual antiplatelet therapy with aspirin and clopidogrel were treated with highly purified EPA-E (Epadel ® ) for 12 weeks. Based on our previous study, patients with a high baseline EPA/arachidonic acid (AA) ratio (≥ 0.37; n = 11) were given a standard dose (1800 mg daily) of EPA-E, whereas those with a low EPA/AA ratio (&lt; 0.37; n = 20) were given a high dose (2700 mg daily) to reach the target value of &gt; 0.92. Platelet function was then evaluated with agonist-induced aggregation using light transmittance aggregometry and VerifyNow ® . After EPA-E treatment, the EPA/AA ratio significantly increased from 0.28 to 1.31 (P &lt; 0.001). Collagen (1, 2, and 4 μg/mL)-induced maximal platelet aggregation (MPA) was significantly suppressed after EPA-E administration (from 28.0 to 24.0, P = 0.033; from 44.0 to 40.0, P = 0.016; from 60.0 to 56.0, P = 0.010; respectively). However, there were no changes in MPA induced by adenosine diphosphate and AA and in P2Y12 reaction units (PRU) and aspirin reaction units. After EPA-E treatment, PRU was significantly suppressed in 8 patients showing high on-treatment platelet reactivity (HTPR) (baseline 305; 266-321 versus on-treatment 256; 233-261, P = 0.012), but not in those without HTPR (201; 156-220 versus 183; 159-233, P = 0.212). In conclusion, EPA treatment at a sufficient dose suppressed platelet aggregation and showed possible add-on effects in patients with clopidogrel hyporesponsiveness.

Add-on Antiplatelet Effects of Eicosapentaenoic Acid With Tailored Dose Setting in Patients on Dual Antiplatelet Therapy