Polypill Strategy for Evidence-Based Management of Patients With Acute Coronary Syndrome Undergoing Percutaneous Coronary Intervention in an Underserved Patient Population

Acute coronary syndromes (ACS) represent a large contributor to patient morbidity and mortality and healthcare costs. Patients with suspected ACS are referred for diagnostic coronary angiography, and if obstructive coronary disease is found, percutaneous coronary intervention (PCI) has been proven to reduce mortality and reduce recurrent myocardial infarction. Medical therapy for ACS involves treatment with a statin and dual antiplatelet drug therapy with aspirin and P2Y12 inhibition.

Dual antiplatelet therapy (DAPT) is a vital aspect of post-PCI care and ensures stent patency. Aspirin blocks metabolism of arachidonic acid and production of thromboxane A2 through irreversible inhibition of cyclooxygenase 1. Prasugrel and clopidogrel are irreversible inhibitors of the platelet P2Y12 ADP receptors, while ticagrelor is a reversible inhibitor of the platelet P2Y12 ADP receptor. Current guidelines recommend dual antiplatelet therapy for at least 1 month and ideally up to 1 year for patients treated medically, and at least 1 year for patients treated with DES after hospitalization for ACS.

Additionally, lipid lowering therapy is a cornerstone of post-ACS care. Multiple studies have demonstrated a direct correlation between low-density lipoprotein cholesterol (LDL-C) levels and ASCVD risk. Statins (3-hydroxy-3-methylgultaryl-coenzyme A reductase inhibitors) are first-line therapies used to achieve LDL-C reductions. High-intensity statins, such as atorvastatin 40 mg or 80 mg or rosuvastatin 20 mg or 40 mg, can lower LDL-C by > 50%, and patients with history of ACS have greater benefit from high-intensity statins versus low-intensity statins. Importantly, administration of a high-intensity statin is a Class 1 recommendation from the AHA/ACC Non-ST-Elevation ACS guidelines and the ST-Elevation ACS guidelines.

The combination of prompt diagnosis of ACS, management with coronary angiography with possible DES placement, and medical therapy including DAPT has led to improvements in ACS mortality. However, nonadherence to cardiovascular medications is common. Data from the US Veteran's Affair's hospitals show that nearly 30% of patients did not refill clopidogrel after index hospitalization for ACS. In a study of the PREMIER registry, one in seven patients stopped taking clopidogrel therapy after 1 month, and those who stopped had ninefold elevated risk of death within 1 year. Poor adherence to antiplatelet therapy with either aspirin or P2Y12 inhibitors can lead to in-stent thrombosis, a particularly morbid occurrence characterized by high patient morbidity and mortality. Early stoppage of dual antiplatelet therapy increases risk of stent thrombosis 90-fold.

Nonadherence to statins is also well documented. Roughly 1/3 of ischemic heart disease is related to dyslipidemia, and statins are the mainstay of treatment. However, roughly 25-50% of patients discontinue their statin therapy within the first year after treatment initiation. Lipid reduction is a proven strategy to prevent further cardiovascular events, however, medication nonadherence is a significant barrier.