Aspirin Therapy in Ischemic Stroke

Introduction to Aspirin Therapy

• The American Heart Association recommends administering a loading dose of 160 mg aspirin immediately after brain imaging excludes hemorrhage, followed by 81-325 mg daily for long-term secondary prevention 1, 2

Acute Phase Dosing

• For acute ischemic stroke, administer at least 160 mg aspirin as a single loading dose immediately after brain imaging excludes intracranial hemorrhage and dysphagia screening is performed and passed 1, 2, 3
• The loading dose can range from 160-325 mg 4, 5
• Critical timing: Give within 48 hours of symptom onset for maximum benefit 5

Special Populations

• For minor stroke or high-risk TIA, use dual antiplatelet therapy with higher loading doses: aspirin 160-325 mg and clopidogrel 300-600 mg 1, 2, 4
• Maintenance dual therapy: aspirin 75-100 mg daily plus clopidogrel 75 mg daily for 21-30 days only 1, 2, 4

Long-Term Maintenance Dosing

• Continue aspirin 81-325 mg daily indefinitely for secondary stroke prevention 1, 2, 3, 4, 5
• The most commonly recommended range is 81-325 mg daily 1, 2, 4, 5

Alternative Routes for Dysphagia

• When oral administration is not possible, use enteral tube: 80-81 mg daily or rectal suppository: 325 mg daily 1, 2, 3

Aspirin Administration for Ischemic Stroke

Introduction to Aspirin Therapy

• The American Heart Association recommends administering aspirin 160-325 mg immediately for patients presenting with stroke-like symptoms, but only after brain imaging excludes intracranial hemorrhage and the patient has not received IV thrombolysis within the past 24 hours, with a strength of evidence based on landmark trials 6

Acute Dosing and Administration

• The American Heart Association/American Stroke Association specifically recommends 160-325 mg aspirin within 24-48 hours of symptom onset, with a number needed to treat of 79 to prevent one death or dependency 6
• Non-enteric coated formulation is preferred for faster buccal absorption, reducing stroke mortality and morbidity 7

Critical Considerations

• Check for aspirin contraindications, such as active gastrointestinal bleeding or documented aspirin allergy, before administering aspirin 6
• Do not delay aspirin beyond 48 hours in confirmed ischemic stroke, as early administration provides maximum benefit 6
• Do not use enteric-coated formulations acutely, as they delay absorption when rapid platelet inhibition is needed 7