From the Guidelines
You should take aspirin after a Transient Ischemic Attack (TIA) to reduce the risk of another TIA or a full stroke. The most recent and highest quality study, 1, recommends early aspirin therapy at a dose of 160 to 325 mg within 48 hours of a TIA. Aspirin works by preventing platelets in your blood from sticking together and forming clots, which reduces your risk of having another TIA or a full stroke. Some key points to consider:
- The American College of Chest Physicians recommends long-term treatment with aspirin (75-100 mg once daily) for patients with a history of noncardioembolic ischemic stroke or TIA 1.
- The American Heart Association/American Stroke Association recommends the use of antiplatelet agents, such as aspirin, to reduce the risk of recurrent stroke and other cardiovascular events 2.
- Aspirin therapy should be started under medical supervision, as it can cause side effects like stomach irritation and bleeding.
- It's essential to inform your doctor about any other medications you're taking to avoid potential interactions.
- The selection of an antiplatelet agent should be individualized based on patient risk factor profiles, cost, tolerance, and other clinical characteristics 2.
From the Research
Aspirin Therapy After Transient Ischemic Attack (TIA)
- Aspirin is commonly used for the prevention of stroke recurrence after a Transient Ischemic Attack (TIA) or minor ischemic stroke 3, 4, 5, 6, 7.
- The risk of major hemorrhages in patients receiving aspirin alone after TIA or minor AIS is low, with a frequency of 0.2% 3.
- However, treatment with clopidogrel plus aspirin increases the risk of major hemorrhages over aspirin alone from 0.2% to 0.9% 3.
- Dual antiplatelet therapy (DAPT) with clopidogrel and aspirin may provide greater protection against subsequent stroke than monotherapy, but it is associated with a significantly increased risk of moderate or severe bleeding 5, 6.
- Short-duration DAPT (≤ 1 month) started during the early acute ischemic phase is associated with less bleeding than longer DAPT and a greater reduction of recurrent strokes compared with monotherapy 6.
Benefits and Risks of Aspirin Therapy
- Aspirin prevents one to two vascular events (stroke, AMI, or vascular death) per 100 treatment-years with an excess risk of fatal and severe bleeds of 0.4-0.6 per 100 treatment-years 7.
- The combination of dipyridamole and aspirin prevents 2.82 strokes at the expense of an excess risk of 0.61 fatal or severe bleeds per 100 treatment-years 7.
- The aspirin-associated risk of hemorrhagic complications is much increased in the acute phase of stroke compared with the stable phase after stroke 7.
Clinical Considerations
- The decision to use aspirin after a TIA should be based on individual patient risk factors and the potential benefits and risks of therapy 3, 4, 5, 6, 7.
- Patients with high-risk TIA or minor AIS may benefit from dual antiplatelet therapy, but the risk of bleeding should be carefully considered 3, 5, 6.