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[Correspondence] ANTARCTIC: platelet function testing to adjust therapy

We read the ANTARCTIC study by Guillaume Cayla and colleagues1 with interest. The authors interpreted that platelet function monitoring with treatment adjustment did not improve the clinical outcome of elderly patients treated with coronary stenting for an acute coronary syndrome. We think that the following granular conclusion is more appropriate: elderly patients with acute coronary syndrome given low-dose prasugrel who had low on-treatment reactivity identified by platelet function testing did not have reduced bleeding after switching to clopidogrel therapy.