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Timing of clopidogrel loading before percutaneous coronary intervention in clopidogrel-naive patients with stable or unstable angina: a comparison of two strategies.
Am Heart J. 2009 Oct;158(4):585-91
Authors: Davlouros PA, Arseniou A, Hahalis G, Chiladakis J, Mazarakis A, Damelou A, Karakantza M, Paliogianni F, Karogiannis N, Alexopoulos D
BACKGROUND: Clopidogrel-naive patients subjected to coronary angiography may be candidates for percutaneous coronary intervention (PCI). Clopidogrel loading with 600 mg at least 2 hours before the procedure is advised for such patients. However, there is no direct evidence that delaying PCI for 2 hours after clopidogrel loading is superior to ad hoc PCI. METHODS: After coronary angiography, clopidogrel-naive patients (N = 199) with stable or unstable angina, candidates for PCI, were loaded with 900 mg of clopidogrel and then randomized to ad hoc PCI (ad hoc group, n = 103) or delayed PCI 2 hours after loading (delayed group, n = 96). Combined primary end point was death/periprocedural myocardial infarction (MI)/stroke/reintervention within 30 days post-PCI. Secondary end points were periprocedural MI; periprocedural creatine kinase-MB elevation >3 x upper limit of normal; any periprocedural increase of creatine kinase-MB, troponin-I, or myoglobin above upper limit of normal; Thrombolysis in Myocardial Infarction flow <3 after PCI; thrombocytopenia with platelet count of <70,000/mL; major bleeding defined according to the Thrombolysis in Myocardial Infarction criteria; and elevation of high-sensitivity C-reactive protein and soluble P selectin. RESULTS: Primary end point occurred in 12.6% ad hoc group versus 15.6% delayed group patients (P = .34). High-sensitivity C-reactive protein increased in both groups post-PCI (analysis of variance P < .0001) without difference between groups (P = .5). Major bleeding occurred in 2.9% ad hoc group versus 3.1% delayed group patients (P = .9). No significant difference was observed in any other secondary end point. CONCLUSIONS: In clopidogrel-naive patients, a strategy of delaying PCI for 2 hours after high-dose clopidogrel loading does not seem to confer any benefit compared to ad hoc PCI.
PMID: 19781418 [PubMed - in process]