Management of Antiplatelet Therapy in CABG and PCI

Introduction to Antiplatelet Management

The American Heart Association recommends that clopidogrel be discontinued at least 5 days before elective CABG to prevent excessive perioperative bleeding, with evidence showing no increase in bleeding or transfusions when CABG is performed ≥5 days after stopping clopidogrel 1, 2.
The American College of Cardiology suggests that for urgent CABG, clopidogrel should be discontinued for at least 24 hours to reduce major bleeding complications, though some increase in blood transfusions remains likely 1, 2, 4.

The Society of Thoracic Surgeons recommends that clopidogrel be stopped at least 5 days before surgery to allow adequate dissipation of its irreversible antiplatelet effect and prevent excessive perioperative bleeding 1, 2, 3.
Major bleeding complications, such as pericardial tamponade and reoperation, are significantly increased when CABG is performed within 24 hours of clopidogrel discontinuation 1, 2, 4.

The American College of Cardiology recommends that clopidogrel be continued during and after PCI because abrupt discontinuation dramatically increases the risk of stent thrombosis, myocardial infarction, and death 5, 6.
For bare-metal stents, clopidogrel is required for a minimum of 1 month, and for drug-eluting stents, clopidogrel must continue for at least 12 months, particularly in acute coronary syndrome patients 7, 8, 6.
The highest thrombotic risk period is within 30 days of stent placement, with ongoing risk of 0.2-0.6% per year thereafter 5, 6.

Clopidogrel irreversibly inhibits the P2Y12 receptor on platelets for their entire 7-10 day lifespan, which creates massive hemostatic challenges during CABG 1, 2.
Dual antiplatelet therapy, including aspirin and clopidogrel, is required to prevent catastrophic acute stent thrombosis during PCI 7, 8, 6.

The American Heart Association advises that aspirin should be continued throughout the perioperative period for both CABG and PCI, as it reduces operative morbidity and mortality with only modest bleeding increase 1, 2, 4.
For patients requiring both CABG and PCI, the Society of Thoracic Surgeons recommends that CABG be performed first, then PCI, to minimize perioperative bleeding risk from dual antiplatelet therapy 1, 2.