Approximately 10% of patients with non–ST-segment elevation and acute coronary syndromes (ACS) require coronary artery bypass grafting (CABG) during the same hospitalization.
1 Irrespective of the revascularization strategy, P
2Y
12 inhibitor agents are recommended in addition to aspirin (class of recommendation 1 and level of evidence A) in patients with ACS.
2,3 Ticagrelor is a newer P
2Y
12 inhibitor that has been demonstrated to significantly reduce the risk of a composite end point of death from vascular causes, myocardial infarction, and stroke.
4 In this scenario, patients requiring CABG represent a challenging group of individuals because of the difficulties in balancing thrombosis and bleeding risks in relation to the timing of surgery and optimal antithrombotic therapy management. Current revascularization guidelines and the US Food and Drug Administration–approved patient labeling recommend discontinuation of ticagrelor therapy 5 days before surgery.
5-7 This recommendation is substantiated by the lack of difference between clopidogrel bisulfate and ticagrelor in terms of major bleeding in subgroups with different intervals between cessation of study treatment and CABG and the observation of a reduction in bleeding risk when use of these drugs were discontinued for at least 5 days before surgery.
8 Concern exists that a discontinuation of several days may be associated with an increased risk of cardiovascular events while awaiting surgery.
9,10 Indeed, in the Platelet Inhibition and Patient Outcomes (PLATO) trial,
3 it was recommended that, in patients undergoing CABG, administration of ticagrelor should be withheld for 24 to 72 hours, and prior guidelines suggested a shorter discontinuation of treatment in patients requiring urgent CABG.
10,11 The absence of randomized studies makes it difficult to establish the exact risk of bleeding complications after perioperative ticagrelor administration and its optimal timing of discontinuation before surgery.
12-15 To our knowledge, no data exist on any possible increased risk of bleeding associated with exposure to ticagrelor with or without aspirin compared with aspirin alone among patients with ACS undergoing CABG. The prospective European Multicenter Study on Coronary Artery Bypass Grafting (E-CABG) registry
16 aims to investigate the association of the use of ticagrelor vs aspirin alone with the risk of major bleeding and blood product requirement after surgery.