Sandbox:DN

Overview

Dual antiplatelet therapy (or DAPT) refers to the combination of aspirin and a P2Y12 receptor antagonist. DAPT is approved for SIHD and interventions for ACS, such as stent placement following PCI or CABG. The duration of treatment with DAPT for each of these categories differs and guidelines for treatment have been updated in the 2016 ACC/AHA Guideline Focused Update on Duration of Dual Antiplatelet Therapy in Patients With Coronary Artery Disease. Much of the studies done on DAPT compared the use of different types of P2Y12 receptor antagonists, the dosage of drugs, as well as the duration of treatment. The current consensus is that the use of DAPT is associated with decreased risk of stent thrombosis, MI and stroke. However, the benefits of treatment should be weighed against the increased risk of major bleeding in certain patient populations.

Types and Dosage of Drugs

Aspirin

Aspirin 81 mg once daily (range 75-100 mg) is used in all patients with SIHD, stent placement following PCI or CABG. The use of aspirin should be continued indefinitely.

P2Y12 Inhibitors

There are several P2Y12 inhibitors currently on the market and they are given in the following doses:

• Clopidogrel: 75 mg once daily
• Ticagrelor: 90 mg once daily
• Prasugrel: 10 mg once daily

The drug of choice and duration of treatment depends on the medical condition and current recommendations.

Indications

• ST elevation myocardial infarction anticoagulant and antithrombotic therapy
• Unstable angina / non ST elevation myocardial infarction recommendations for CABG
• ST elevation myocardial infarction coronary artery bypass grafting
• Pharmacotherapy to Support PCI
• Chronic stable angina revascularization adjunctive pharmacotherapy for percutaneous coronary intervention