A 70-year-old female with unexpected platelet functiontesting results

Moon Joo Kim, Pragna Patel, Niti Vyas, Christopher Leveque, Orlando Diaz, Eric Salazar

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A 70-year-old female with a history of hypertension and left A2 segment aneurysm was scheduled for pipeline embolization device (PED) placement. Preinterventional antiplatelet prophylaxis included aspirin and ticagrelor. Unexpectedly, after 13 days of treatment, VerifyNow showed a P2Y12 reaction unit (PRU) value of 216, approximately >5 times the mean PRU of other patients on aspirin and ticagrelor. We confirmed platelet reactivity and ticagrelor resistance with light transmission aggregometry. Antiplatelet therapy was switched to prasugrel, and aspirin was continued. Eight days later, the P2Y12 reaction value (PRU) was 164. PED was placed without complications. Unlike clopidogrel, ticagrelor is a direct P2Y12 inhibitor that does not require metabolism to an active metabolite. Ticagrelor resistance is very rarely reported. To the best of our knowledge, there has been no case of ticagrelor resistance reported in the context of pre-PED placement prophylaxis.

Original languageEnglish (US)
Pages (from-to)310-314
Number of pages5
JournalLab Medicine
Issue number3
StatePublished - 2020


  • Aneurysm
  • Anti-platelet
  • Coagulation
  • Platelet
  • Resistance
  • Ticagrelor

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Biochemistry, medical


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