What medication should be given to a patient 72 hours after an acute ischemic stroke?

Aspirin 81-325 mg daily should be initiated for this patient 72 hours post-stroke

For a patient 72 hours after acute ischemic stroke, aspirin (81-325 mg daily) is the recommended medication, provided they did not receive thrombolysis and have non-cardioembolic stroke. 1

Antiplatelet Therapy at 72 Hours Post-Stroke

Standard Recommendation: Aspirin Monotherapy

• Aspirin 81-325 mg daily should be started within 24-48 hours of stroke onset and continued long-term 1
• At 72 hours post-stroke, if aspirin was not yet initiated, it should be started immediately
• The evidence shows a modest but statistically significant reduction in mortality and recurrent stroke when aspirin is given within 48 hours 1

Critical Timing Consideration for Dual Antiplatelet Therapy (DAPT)

The 72-hour timepoint is crucial because it represents the outer limit for initiating DAPT:

• If the patient has MILD stroke (NIHSS ≤3-5) or high-risk TIA (ABCD2 ≥4), DAPT with aspirin plus clopidogrel can still be initiated up to 72 hours after symptom onset 2, 3
• Recent high-quality evidence from the INSPIRES trial (2023) demonstrates that clopidogrel-aspirin initiated within 72 hours reduces new stroke risk (7.3% vs 9.2%, HR 0.79) 2
• Loading doses: Clopidogrel 300 mg + aspirin 100-300 mg on day 1, then clopidogrel 75 mg + aspirin 100 mg daily for 21 days, followed by single antiplatelet therapy 2

Algorithm for Decision-Making at 72 Hours:

Step 1: Determine stroke severity

• NIHSS ≤3-5 (mild stroke) → Consider DAPT
• NIHSS >5 (moderate-severe stroke) → Aspirin monotherapy only

Step 2: If mild stroke, assess for contraindications to DAPT:

• Did patient receive IV thrombolysis? If yes → Wait 24 hours before any antiplatelet, then aspirin monotherapy only 1
• High bleeding risk? → Aspirin monotherapy
• Cardioembolic source requiring anticoagulation? → Anticoagulation instead

Step 3: If DAPT is appropriate:

• Give loading doses: Clopidogrel 300 mg + aspirin 100-300 mg
• Continue clopidogrel 75 mg + aspirin 100 mg daily for 21 days
• Then switch to single antiplatelet (aspirin 81 mg or clopidogrel 75 mg) 4, 2

Step 4: If DAPT not appropriate:

• Start aspirin 81-325 mg daily immediately
• Continue indefinitely for secondary prevention

Important Caveats

Bleeding Risk with DAPT

• DAPT increases moderate-to-severe bleeding risk (0.9% vs 0.4%, HR 2.08) 2
• The net benefit is most pronounced in the first week after stroke, with continued but lesser benefit in weeks 2-3 3
• Patients with low Essen Stroke Risk Score (<3) derive greater benefit from DAPT than those with higher scores 5

What NOT to Give

• Do NOT use urgent anticoagulation (heparin, LMWH) for acute stroke treatment - it does not improve outcomes and increases bleeding risk 1
• Do NOT use clopidogrel monotherapy in the acute setting - insufficient evidence for efficacy 1
• Do NOT use glycoprotein IIb/IIIa inhibitors outside clinical trials 6, 1

Special Populations at 72 Hours

• Cardioembolic stroke (e.g., atrial fibrillation): Anticoagulation should be considered, but timing depends on infarct size. For large infarcts, delay anticoagulation; for small infarcts, can start within days 1
• Intracranial atherosclerotic stenosis (50-99%): High-dose statin + aspirin 325 mg daily + blood pressure control <140 mmHg systolic 4

Long-term Management Beyond 72 Hours

After the acute period, continue with:

• Single antiplatelet therapy (aspirin 81 mg, clopidogrel 75 mg, or aspirin-dipyridamole) for non-cardioembolic stroke 4, 7, 8
• High-intensity statin therapy to reduce LDL-C by ≥50% 4, 8
• Blood pressure management (target <140/90 mmHg for most patients) 4, 1