Influence of platelet reactivity and response to clopidogrel on myocardial damage following percutaneous coronary intervention in patients with non-ST-segment elevation acute coronary syndrome.
BACKGROUND
A wide variability in the response to clopidogrel and magnitude of post-treatment platelet reactivity has been described. However, this has been demonstrated by light transmittance aggregometry, a method too laborious for daily practice. Point-of-care devices may overcome this limitation, but little is known on the predictive value of such measurements. Our objective was to determine the relationship between platelet reactivity and the incidence of myocardial damage following percutaneous coronary intervention (PCI) in patients with Non-ST-segment Elevation Acute Coronary Syndrome (NSTEACS).


METHODS
This prospective study included 93 patients with NSTEACS and PCI. All patients received a loading dose of 300 mg of clopidogrel and 250 mg of aspirin. Myocardial damage was defined as any elevation above upper limit of normal or previous levels of troponin T, assessed every 6 h for at least 24 h following PCI. Platelet reactivity not related to clopidogrel (BASE reactivity), related to P2Y12 inhibition (P2Y12 reactivity) and inhibition of platelet aggregation (IPA) were assessed immediately pre-PCI with the VerifyNow device.


RESULTS
Myocardial damage was detected in 60 patients (64.5%). Higher BASE reactivity was associated with myocardial damage (287.8+/-62.6 vs. 260+/-55.9 units, p=0.043) while a trend was found for P2Y12 reactivity (173.4+/-70.3 vs. 149.2+/-58.4 units, p=0.109). No relationship was detected for IPA. Multivariate logistic regression analysis confirmed that BASE reactivity (p=0.04) and P2Y12 reactivity (p=0.03) were independent predictors of myocardial damage.


CONCLUSIONS
Platelet reactivity before PCI appears to be better predictor of myocardial damage than does response to clopidogrel.
Perez de Prado
Armando
A
Department of Cardiology, Hospital de Leon, Spain. aperez@secardiologia.es
Cuellas
Carlos
C
Diego
Alejandro
A
de Miguel
Antonio
A
Samaniego
Beatriz
B
Alonso-Orcajo
Norberto
N
Carbonell
Raul
R
Pascual
Cristina
C
Fernandez-Vazquez
Felipe
F
Calabozo
Ramon G
RG
D054058:Acute Coronary Syndrome / Q000097:blood* / Q000188:drug therapy; D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000379:methods*; D001241:Aspirin / Q000627:therapeutic use; D001792:Blood Platelets / Q000166:cytology* / Q000378:metabolism; D000077144:Clopidogrel; D005260:Female; D006321:Heart / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000473:pathology*; D010974:Platelet Aggregation; D011446:Prospective Studies; D058919:Purinergic P2 Receptor Antagonists; D058925:Receptors, Purinergic P2Y12; D013988:Ticlopidine / Q000031:analogs & derivatives* / Q000627:therapeutic use
C548576:P2RY12 protein, human; D058919:Purinergic P2 Receptor Antagonists; D058925:Receptors, Purinergic P2Y12; D000077144:Clopidogrel; D013988:Ticlopidine; D001241:Aspirin