Pharmacodynamic evaluation of switching from ticagrelor to prasugrel in patients with stable coronary artery disease: Results of the swap-2 study (switching anti platelet-2)

Dominick J. Angiolillo, Nicholas Curzen, Paul Gurbel, Paul Vaitkus, Fred Lipkin, Wei Li, Joseph A. Jakubowski, Marjorie Zettler, Mark B. Effron, Dietmar Trenk

Research output: Contribution to journalArticlepeer-review

71 Scopus citations


Objectives: The goal of this study was to evaluate the pharmacodynamic effects of switching patients from ticagrelor to prasugrel. Background: Clinicians may need to switch between more potent P2Y12 inhibitors because of adverse effects or switch to the use of a once-daily dosing regimen due to compliance issues. Methods: After a 3- to 5-day run-in phase with a ticagrelor 180-mg loading dose (LD) followed by a ticagrelor 90-mg twice-daily maintenance dose (MD), aspirin-treated patients (N = 110) with stable coronary artery disease were randomized to continue ticagrelor or switch to prasugrel 10-mg once-daily MD, with or without a 60-mg LD. Pharmacodynamic assessments were defined according to P2Y12 reaction unit (PRU) (P2Y12 assay) and platelet reactivity index (vasodilator-stimulated phosphoprotein phosphorylation assay) at baseline (before and after the run-in phase) and 2, 4, 24, and 48 h and 7 days after randomization. Results: Platelet reactivity was significantly greater at 24 and 48 h after switching to prasugrel versus continued therapy with ticagrelor, although to a lesser extent in those receiving an LD. Mean PRU remained significantly higher in the combined prasugrel groups versus the ticagrelor group (least-squares mean difference: 46 [95% confidence interval 25 to 67]) and did not meet the primary noninferiority endpoint (upper limit of the confidence interval ≤45), although PRU in the prasugrel cohort was lower at 7 days than at 24 or 48 h. Accordingly, rates of high on-treatment platelet reactivity were higher at 24 and 48 h in both prasugrel groups. At 7 days, there was no difference in high on-treatment platelet reactivity rate between the combined prasugrel and ticagrelor groups. Conclusions: Compared with continued ticagrelor therapy, switching from ticagrelor to prasugrel therapy was associated with an increase in platelet reactivity that was partially mitigated by the administration of an LD.

Original languageEnglish (US)
Pages (from-to)1500-1509
Number of pages10
JournalJournal of the American College of Cardiology
Issue number15
StatePublished - Apr 22 2014
Externally publishedYes


  • drug interaction
  • pharmacodynamics
  • platelet function
  • prasugrel
  • ticagrelor

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


Dive into the research topics of 'Pharmacodynamic evaluation of switching from ticagrelor to prasugrel in patients with stable coronary artery disease: Results of the swap-2 study (switching anti platelet-2)'. Together they form a unique fingerprint.

Cite this