Acute Ischemic Stroke Management in Adults

Aspirin and Clopidogrel Dosing

The American Heart Association recommends a single loading dose of aspirin 160-325 mg for all patients with acute ischemic stroke, regardless of age, after excluding intracranial hemorrhage on neuroimaging 1
This dose should be administered within the first 24-48 hours of symptom onset to achieve rapid and complete inhibition of thromboxane A2-dependent platelet aggregation 1
The American College of Cardiology notes that there is no excess risk of major bleeding with antiplatelet therapy in older adults, based on data from the COMMIT trial, which included 26% of patients ≥70 years 1
No apparent trend was observed with respect to age in the excess risk of bleeding with antiplatelet therapy 1

For patients with minor ischemic stroke or high-risk transient ischemic attack, a loading dose of clopidogrel 300-600 mg should be administered along with aspirin 160-325 mg within the first 12-24 hours of symptom onset 1, 2
A dose of 300 mg produces antiplatelet effects within 90 minutes, and after 6 hours, the antithrombotic effects are equivalent to those achieved after 10 days of therapy with 75 mg daily 3
In patients ≥75 years, no loading dose of clopidogrel should be administered; instead, start directly with 75 mg daily 3
The American Heart Association guidelines indicate that there is limited evidence on the use of loading doses of clopidogrel in patients ≥75 years, recommending caution in this population 4, 3

Dual antiplatelet therapy with aspirin and clopidogrel is indicated for patients with minor ischemic stroke or high-risk transient ischemic attack, and should be initiated within the first 12-24 hours of symptom onset and continued for exactly 21 days, followed by transition to single antiplatelet therapy 1, 2
Dual antiplatelet therapy reduces the risk of recurrent ischemic events by 25-32% compared to single antiplatelet therapy in patients with minor stroke or high-risk transient ischemic attack 1
The benefit of dual antiplatelet therapy is concentrated in the first 21 days, particularly in the first week after the initial event 1

Do not administer loading doses until intracranial hemorrhage has been ruled out by neuroimaging 1, 2
Avoid dual antiplatelet therapy in patients with high risk of bleeding, history of intracranial hemorrhage, or anticipated need for major surgery 1
In addition to age ≥75 years, other risk factors for bleeding include previous stroke or transient ischemic attack, body weight <60 kg, and concomitant use of medications that increase the risk of bleeding 3
For elderly patients who may require urgent coronary revascularization surgery, clopidogrel should be discontinued ideally 5-7 days before surgery 5, 3

After 21 days of dual antiplatelet therapy, switch to single antiplatelet therapy with aspirin 75-100 mg daily or clopidogrel 75 mg daily, as both agents are equally effective for long-term secondary prevention 1
Do not continue dual antiplatelet therapy beyond 90 days, as prolonged use significantly increases the risk of major bleeding without additional benefit 1