NDLI: Prevalence of ex vivo high on-treatment platelet reactivity on antiplatelet therapy after transient ischemic attack or ischemic stroke on the PFA-100(®) and VerifyNow(®).

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Prevalence of ex vivo high on-treatment platelet reactivity on antiplatelet therapy after transient ischemic attack or ischemic stroke on the PFA-100(®) and VerifyNow(®).

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kinsella, Justin A. Tobin, W. Oliver Cox, Dermot Coughlan, Tara Collins, Ronan O'Neill, Desmond Murphy, Raymond P. McCabe, Dominick J. H.
Description	Country affiliation: Ireland Author Affiliation: Kinsella JA ( Department of Neurology, The Adelaide and Meath Hospital, incorporating the National Children's Hospital, Trinity College Dublin, Ireland.)
Abstract	BACKGROUND: The prevalence of ex vivo high on-treatment platelet reactivity (HTPR) to commonly prescribed antiplatelet regimens after transient ischemic attack (TIA) or ischemic stroke is uncertain. METHODS: Platelet function inhibition was simultaneously assessed with modified light transmission aggregometry (VerifyNow; Accumetrics Inc, San Diego, CA) and with a moderately high shear stress platelet function analyzer (PFA-100; Siemens Medical Solutions USA, Inc, Malvern, PA) in a pilot, cross-sectional study of TIA or ischemic stroke patients. Patients were assessed on aspirin-dipyridamole combination therapy (n = 51) or clopidogrel monotherapy (n = 25). RESULTS: On the VerifyNow, HTPR on aspirin was identified in 4 of 51 patients (8%) on aspirin-dipyridamole combination therapy (≥ 550 aspirin reaction units on the aspirin cartridge). Eleven of 25 (44%) patients had HTPR on clopidogrel (≥ 194 P2Y12 reaction units on the P2Y12 cartridge). On the PFA-100, 21 of 51 patients (41%) on aspirin-dipyridamole combination therapy had HTPR on the collagen-epinephrine (C-EPI) cartridge. Twenty-three of 25 patients (92%) on clopidogrel had HTPR on the collagen-adenosine diphosphate (C-ADP) cartridge. The proportion of patients with antiplatelet HTPR was lower on the VerifyNow than PFA-100 in patients on both regimens (P < .001). CONCLUSIONS: The prevalence of ex vivo antiplatelet HTPR after TIA or ischemic stroke is markedly influenced by the method used to assess platelet reactivity. The PFA-100 C-ADP cartridge is not sensitive at detecting the antiplatelet effects of clopidogrel ex vivo. Larger prospective studies with the VerifyNow and with the PFA-100 C-EPI and recently released Innovance PFA P2Y cartridges (Siemens Medical Solutions USA, Inc) in addition to newer tests of platelet function are warranted to assess whether platelet function monitoring predicts clinical outcome in ischemic cerebrovascular disease.
File Format	HTM / HTML
ISSN	10523057
Issue Number	7
Volume Number	22
e-ISSN	15328511
Journal	Journal of Stroke and Cerebrovascular Diseases
Language	English
Publisher	Elsevier
Publisher Date	2013-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Brain Ischemia Cross-sectional Studies Ischemic Attack, Transient Humans Middle Aged Male Journal Article Aspirin, Dipyridamole Drug Combination Discipline Cardiology Platelet Function Tests Adult Female Stroke Aspirin Drug Therapy Blood Platelets Dipyridamole Pharmacology Aged, 80 And Over Drug Effects Therapeutic Use Ticlopidine Platelet Aggregation Pilot Projects Platelet Aggregation Inhibitors Aged Drug Combinations Analogs & Derivatives
Content Type	Text
Resource Type	Article
Subject	Rehabilitation Neurology (clinical) Surgery Cardiology and Cardiovascular Medicine

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