Abstract
Antiplatelet agents comprise a critical component in the multi-modality treatment of ischemic heart disease. In addition to anticholesterol, beta-blocking, and angiotensin-converting enzyme inhibiting agents as well as mechanical intervention, platelet inhibition has resulted in improved outcomes for patients with ischemic heart disease. Platelet aggregation and resultant thrombus formation is a multi-step process with several points of potential intervention. As this pathway has been elucidated, more opportunities to intervene pharmacologically have become apparent.
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Appendix
Appendix
Recommended antiplatelet therapy for chronic ischemic heart disease
 | Secondary prevention | Prior to elective PCI |
---|---|---|
Aspirin | 75–81 mg daily indefinitelya | 300–325 mg loading dose for those not on aspirin (or on lower daily dose), then   162–325 mg daily for 1 month for BMSb   162–325 mg daily for 3 months for SES7b   162–325 mg daily for 6 months for PESb, followed by 75–162 mg daily indefinitely |
Clopidogrel | 75 mg daily indefinitely in patients intolerant to aspirin 75 mg daily combined with aspirin up to 1 year after hospitalization for ACS | 600 mg loading dose at least 2 h (preferably 24 h) prior to PCI, then   75 mg daily for at least 1 month for BMS   75 mg daily 1 year for DES |
GP IIb/IIIa inhibitors | None | Use is generally limited to patients with higher risk, those who have not received pretreatment with clopidogrel, or those with a higher risk angiographic resultc |
Recommended antiplatelet therapy for unstable angina and non-ST segment elevation myocardial infarction
 | Conservative strategy | Invasive strategy | |
---|---|---|---|
Aspirin | 162–325 mg loading dose, followed by 75–162 mg daily indefinitely | 162–325 mg loading dose, followed by   162–325 mg daily for 1 month for BMSa   162–325 mg daily for 3 months for SESa   162–325 mg daily for 6 months for PESa, followed by 75–162 mg daily indefinitely | |
ADP inhibitors | Clopidogrel 300Â mg loading dose followed by 75Â mg daily for at least 1 month, ideally for 1 year Prasugrel Not currently recommended, under investigation Ticagrelor 180Â mg loading dose, followed by 90Â mg twice daily for at least 1 yeard | Clopidogrel 600Â mg loading dose, followed by 75Â mg for at least 1 month for BMS (ideally 1 year) or 75Â mg 1 year for DESb, OR Prasugrel (if patient is undergoing PCI)c 60Â mg loading dose, followed by 10Â mg daily for at least 1 year, OR Ticagrelor 180Â mg loading dose, followed by 90Â mg twice daily for at least 1 yeard | |
GP IIb/IIIa inhibitors | Eptifibatide or tirofiban use is reserved for refractory symptoms or in patients not receiving an ADP inhibitor. Abciximab use is not recommended Eptifibatide: 180 mcg/kg IV bolus, followed by 2 mcg/kg/min; reduce to 1 mcg/kg/min if CrCl < 50 mL/min Tirofiban: 25 mcg/kg IV bolus, then 0.15 mcg/kg/min; reduce by 50 % if CrCl < 30 mL/min | Upstream | At time of PCI |
Eptifibatide or Tirofiban for patients who did not receive ADP inhibitor prior to PCI Consider GP IIb/IIIa inhibitor, in addition to aspirin and ADP inhibitor, in high risk patients (elevated troponin levels, diabetes, or significant ST-segment depression) | GP IIb/IIIa inhibitors (abciximab, eptifibatide, or tirofiban) can be administered to patients with higher risk angiographic features or in patients with thrombotic complications   Abciximab: 0.25 mg/kg IV bolus, then 0.125 mcg/kg/min up to 12 h   Eptifibatide: 180 mcg/kg IV bolus followed by second 180 mcg/kg IV bolus after 10 min. 2.0 mcg/kg/min should be started after the first bolus; reduce rate by 50 % in patients with CrCl < 50 mL/min. Continue for 12–18 h   Tirofiban: 25 mcg/kg IV bolus, then 0.1 mcg/kg/min; reduce rate by 50 % in patients with CrCl < 30 mL/min. Continue for 18 h | ||
GP IIb/IIIa inhibition may be omitted if bivalirudin is used as the anticoagulant and at least 300Â mg of clopidogrel was given more than 6Â h prior to PCI |
Recommended antiplatelet therapy for ST-segment myocardial infarction
 | Receiving fibrinolysis | Undergoing primary PCI |
---|---|---|
Aspirin | 162–325 mg loading dose, followed by   162–325 mg daily for 1 month for BMSa   162–325 mg daily for 3 months for SESa   162–325 mg daily for 6 months for PESa, followed by 75–162 mg daily indefinitely | 162–325 mg loading dose, followed by   162–325 mg daily for 1 month for BMSa   162–325 mg daily for 3 months for SESa   162–325 mg daily for 6 months for PESa, followed by 75–162 mg daily indefinitely |
ADP inhibitors | Clopidogrel Age <75: 300 mg loading dose followed by 75 mg daily for at least 14 days, ideally for 1 year. Age ≥75: 75 mg daily with no loading dose for at least 14 days, ideally for 1 year Prasugrel Not recommended; has not been studied Ticagrelor Not recommended; has not been studied | Clopidogrel 600 mg loading dose, followed by 75 mg for at least 1 month for BMS (ideally 1 year) or 75 mg 1 year for DESb, OR Prasugrel c 60 mg loading dose, followed by 10 mg daily for at least 1 year , OR Ticagrelor 180 mg loading dose, followed by 90 mg twice daily for at least 1 yeard |
GP IIb/IIIa inhibitors | Of uncertain benefit | At time of PCI with heparin used as the anticoagulant, either: Abciximab: 0.25 mg/kg IV bolus, followed by 0.125 mcg/kg/min up to 12 h Eptifibatide: 180 mcg/kg IV bolus followed by another 180mcg/kg IV bolus after 10 min. 2.0 mcg/kg/min should be started after the first bolus; reduce rate by 50 % in patients with CrCl < 50 mL/min. Continue for 12–18 h Tirofiban: 25 mcg/kg IV bolus followed by 0.1 mcg/kg/min; reduce rate by 50 % in patients with CrCl < 30 mL/min. Continue for 18 h If bivalirudin is used as the anticoagulant, GP IIb/IIIa inhibitors can be used provisionally for ischemic complications, angiographic complications, or high-risk features |
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May, C.H., Lincoff, A.M. (2012). Antiplatelet Agents in Ischemic Heart Disease. In: Gresele, P., Born, G., Patrono, C., Page, C. (eds) Antiplatelet Agents. Handbook of Experimental Pharmacology, vol 210. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29423-5_20
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