DAN-RELEASE - Reconsidering Long-Term Aspirin in the Elderly Patients With Stable Ischemic Heart Disease

Rationale:

Current guidelines recommend life-long aspirin therapy in patients with chronic coronary syndrome. The evidence supporting long-term aspirin therapy after myocardial infarction (MI) and for chronic coronary syndrome stems primarily from trials conducted in the 1970s and 1980s. Since then, the clinical landscape of MI has evolved markedly: The use of highly sensitive cardiac troponins has led to the diagnosis of smaller MIs, coinciding with a shift from predominantly large ST-segment elevation MI (STEMI) to smaller non-STEMI. Acute revascularization is now a part of the routine care for MI and many patients with stable coronary artery disease undergo percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG). Population risk factors have improved, and universal use of statins have contributed to plaque stabilization and reduces progression of disease. As a result, long-term prognosis in patients with MI and chronic coronary syndromes has markedly improved.

Therefore, the absolute ischemic benefit of long-term aspirin therapy may be attenuated, while the risk of bleeding, particularly in older patients, remains clinically relevant. These developments warrant a contemporary re-evaluation of the life-long role of aspirin in long-term secondary prevention of cardiovascular disease, especially in elderly patients with stable disease.

Objective:

To evaluate whether discontinuation of long-term aspirin in elderly patients with stable chronic coronary syndrome is non-inferior to continued aspirin therapy with respect to net clinical outcome.

All clinical outcomes will be registry based except patient-reported outcomes. They will be assessed using questionnaires measuring bleeding symptoms, gastrointestinal discomfort, quality of life and lifestyle behaviour during follow-up.

Trial design:

Investigator-initiated, registry-based, prospective, randomized, open-label, blinded endpoint (PROBE) non-inferiority trial with 1:1 allocation. The trial is conducted as a low-intervention clinical trial using nationwide Danish health registries as the primary data source.

Risk-benefit considerations:

Aspirin is widely used in secondary prevention and is available over the counter, reflecting its well established safety profile and the generally low risk associated with its use. Nevertheless, aspirin is associated with potential adverse effects, including bleeding, gastrointestinal discomfort, and clinically relevant drug interactions, particularly in elderly patients with comorbidities. Based on data from national health registries, the target population - older adults with stable chronic coronary syndrome - represents a clinically stable group with a low event rate of ischemic events. Given that lifelong aspirin therapy is often continued without systematic reassessment, there is a clear ethical justification for evaluating whether continuation remains beneficial - and safe - in an aging population with changing comorbidity profiles.