Monitoring platelet reactivity during prasugrel or ticagrelor washout before urgent coronary artery bypass grafting.

Objectives: Patients with acute myocardial infarction pretreated with prasugrel or ticagrelor may require urgent coronary artery bypass grafting (CABG). However, prasugrel and ticagrelor withdrawal period is recommended for 5-7 days before planned CABG to enable full platelet recovery. We hypothesized that monitoring sequential platelet reactivity (PR) could identify patients with early platelet recovery who may benefit from earlier surgery before the guideline-recommended 5-7 day delay.

Patients And Methods: We performed preoperative PR assays in 35 patients with acute myocardial infarction who received prasugrel (60%) or ticagrelor (40%) and required an urgent CABG. When platelet inhibition levels were favorable, on the basis of the VerifyNow assay, surgery was endorsed. CABG-related bleeding parameters were collected and compared with two matched control groups composed of patients who received fewer potent antiplatelet regimens.

Results: On the basis of platelet function monitoring, we identified 21 (56.7%) patients with a relatively earlier platelet recovery who underwent CABG before the end of the conventional washout period (5-7 days). For these patients, the washout periods were shortened to an average time of 2.6±1.0 days for ticagrelor and 3.8±1.5 days for prasugrel. CABG-related bleeding parameters were comparable with the two matched control groups.

Conclusion: A strategy of performing preoperative PR assays can identify patients who recover platelet function in less than 5-7 days after ticagrelor or prasugrel discontinuation. This strategy may provide the basis for performing urgent CABGs earlier than the currently recommended delay. Future, larger studies are required to establish these preliminary findings.