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  • Title: Correlation between light transmission aggregometry, VerifyNow P2Y12, and VASP-P platelet reactivity assays following percutaneous coronary intervention.
    Author: Gaglia MA, Torguson R, Pakala R, Xue Z, Sardi G, Suddath WO, Kent KM, Satler LF, Pichard AD, Waksman R.
    Journal: J Interv Cardiol; 2011 Dec; 24(6):529-34. PubMed ID: 21919956.
    Abstract:
    BACKGROUND: High on-treatment platelet reactivity is an established risk factor for adverse cardiac events in patients taking clopidogrel following percutaneous coronary intervention (PCI). METHODS: Two hundred patients underwent platelet reactivity testing with VerifyNow P2Y12, vasodilator-stimulated phosphoprotein phosphorylation (VASP), and light transmission aggregometry (LTA) with both 5 and 20 μM of adenosine diphosphate (ADP) following PCI. High on-treatment platelet reactivity was defined as a maximum platelet aggregation ≥46% for LTA ADP 5 μM or ≥60% for 20 μM; platelet reactivity index (PRI) ≥50% for VASP; and platelet reactivity units ≥235 for VerifyNow. Correlation between assays was tested using Spearman coefficients (ρ); agreement among tests in regards to high on-treatment platelet reactivity was evaluated with Kappa statistics (κ). RESULTS: All Spearman correlations had P values <0.001, although ρ ranged from 0.60-0.86. The incidence of high on-treatment platelet reactivity was 39.3% with VASP, 27.3% with VerifyNow, 23.1% with LTA ADP 5 μM, and 16.2% with LTA ADP 20 μM. The strongest correlation was between LTA ADP 5 μM and LTA ADP 20 μM (κ= 0.53, 95% CI 0.37-0.68); the weakest was between VASP and LTA ADP 5 μM (κ= 0.33, 95% CI 0.19-0.47). Overall, the level of agreement between assays was in the moderate to poor range. CONCLUSION: Despite evidence that the most commonly used tests are correlated, agreement among tests is modest at best and demonstrates they are not interchangeable. 
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