Immediate response to prasugrel loading in patients with ST-elevation myocardial infarction: Predictors and outcome

Edward Koifman, Roy Beigel, Romana Herscovici, Paul Fefer, Nurit Rozenberg, Avi Sabbag, Yitschak Biton, Amit Segev, Michael Shechter, Elad Asher, Shlomi Matetzky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Introduction Information regarding immediate response to novel P2Y12 inhibitors in ST-elevation myocardial infarction (STEMI) is scarce and has been associated with adequate reperfusion. Recent studies have shown that the onset of anti-platelet effects of novel P2Y12 inhibitors in patients with STEMI might be slower and more variable than in stable coronary syndrome. We aimed to assess the predictors and significance of immediate platelet response to prasugrel loading in STEMI. Methods Platelet aggregation (PA) was prospectively evaluated in STEMI patients upon prasugrel loading and at primary percutaneous coronary intervention (PPCI). Early platelet responsiveness was defined as percent reduction of PA from baseline to PPCI, divided by the time lapse from loading to PPCI. High- and low-platelet responsiveness was defined as above and below the median value respectively. Results Fifty consecutive STEMI patients (age 58 ± 8, 90% male) underwent PPCI with a mean door-to-balloon time of 42 ± 15 min. Mean PA upon prasugrel loading and at PPCI was 76 ± 9% and 63 ± 19%, respectively. Older age and prior aspirin use were predictors of low platelet responsiveness to prasugrel [β = (− 0.33), p = 0.02 and β = (− 0.28), p = 0.04, respectively]. Fast compared with slow responders demonstrated more frequent early ST resolution (93% vs. 72%, p = 0.02) and lower peak troponin levels (76 ± 62 μg/L vs. 48 ± 28 μg/L, p = 0.05). Conclusions Immediate platelet responsiveness to prasugrel among STEMI patients is highly variable and inversely associated with older age and prior aspirin use. Fast compared with slow responders have improved reperfusion and infarct size markers.

Original languageEnglish
Pages (from-to)176-181
Number of pages6
JournalThrombosis Research
StatePublished - 1 Aug 2016


  • Acute platelet aggregation
  • Myocardial infarction
  • Prasugrel


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