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Journal Article
Observational Study
Optimal platelet function test for in-stent tissue protrusion following carotid artery stenting.
Purpose To determine the best platelet function test for in-stent tissue protrusion following carotid artery stenting (CAS). Methods Patients who underwent CAS were recruited prospectively in this observational study. Combination of aspirin 100 mg/day and clopidogrel 75 mg/day was administered for a minimum of 7 days prior to procedure. Platelet aggregation was measured by light transmittance aggregometry (LTA) following stimulation by adenosine diphosphate (ADP), collagen, and thrombin receptor activating peptide (TRAP) and by the point of care assay, VerifyNow which measures aspirin and thienopyridine reaction units. Results In-stent tissue protrusion with maximum projection area of ≥1 mm2 was detected by optical coherence tomography (OCT) in 10/28 (36%) patients. Baseline characteristics were not significantly different between the two in-stent size groups (i.e., ≥1 mm2 vs. <1 mm2 ) but after stimulation by collagen at 10 and 20 μg/ml, platelet reactivity as measured by LTA was significantly higher in the ≥1 mm2 group compared with the <1 mm2 group. No other differences in platelet function were detected. Conclusions Collagen-induced platelet reactivity was related to in-stent tissue protrusion size following CAS.
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