Residual platelet reactivity is an independent predictor of myocardial injury in acute myocardial infarction patients on antiaggregant therapy.

Abstract:

:In this study we sought to evaluate if platelet function measured after percutaneous coronary intervention (PCI) affects the severity of myocardial infarction (MI), measured by markers of cardiac necrosis. We measured platelet function by both a point-of-care assay (PFA-100) and platelet-rich plasma aggregation by two agonists (arachidonic acid -AA- and 2 and 10 microM ADP) in 367 patients with MI after PCI (200 patients on dual antiplatelet agents - group A- and 167 on dual antiplatelet agents plus GpIIb/IIIa inhibitors - group B). One hundred twenty-one (32.9%) patients were found to have a residual platelet reactivity (RPR) by PFA (CT/EPI <203 sec): 74/200 (37%) in group A and 47/167 (28.1%) in group B (p = 0.07). In 129 (35.1%) patients we found a RPR by AA-PA: 80/200 (40%) in group A and 49/167 (29.3%) in group B (p < 0.05). Seventeen out of 367 (4.6%) were found to have a RPR by ADP2-PA [15/200 (7.5%) in group A and 2/167 (1.2%) in group B; p < 0.005] and 88/367 (23.9%) by ADP10-PA [64/200 (32%) in group A and 24/167 (14.4%) in group B, p < 0.0001]. CK-MB and cTnI mean peak values were significantly higher in the first tertile of CT/ADP and CT/EPI distribution with respect to the other tertiles and they were significantly higher in patients with RPR by CT/EPI in both group A and group B patients. CK-MB and cTnI peak values were significantly higher in the third tertile of AA-PA, ADP 2 microM-PA and ADP 10 microM-PA distribution with respect to the other tertiles and were significantly higher in patients with RPR by AA-PA and by ADP 10-PA in both group A and group B patients. Multivariate analysis revealed platelet function as an independent predictor of CK-MB and cTnI peak values in both groups of patients independently of clinical, laboratory ad procedural parameters. In conclusion, we found that the severity of MI in patients with MI undergoing primary PCI is influenced by a persistent platelet activation on multiple antiplatelet therapy.

journal_name

Thromb Haemost

authors

Marcucci R,Paniccia R,Antonucci E,Poli S,Gori AM,Valente S,Giglioli C,Lazzeri C,Prisco D,Abbate R,Gensini GF

subject

Has Abstract

pub_date

2007-10-01 00:00:00

pages

844-51

issue

4

eissn

0340-6245

issn

2567-689X

pii

07100844

journal_volume

98

pub_type

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