Is it safe to give aspirin now, assuming intracerebral hemorrhage has been excluded, platelet count is >100 × 10⁹/L, INR ≤1.7, and blood pressure <185/110 mmHg?

Yes, Give Aspirin Now

Based on the clinical scenario provided (intracerebral hemorrhage excluded, platelets >100 × 10⁹/L, INR ≤1.7, BP <185/110 mmHg), you should administer aspirin for acute ischemic stroke within 24-48 hours of symptom onset. 111

Key Decision Points

The 2018 AHA/ASA Guidelines provide a Class I, Level A recommendation for aspirin administration in acute ischemic stroke patients within 24-48 hours after onset 111. This is the strongest possible recommendation grade, supported by two large clinical trials and confirmed by Cochrane review.

Dosing Guidance

• Dose range: 160-300 mg (guidelines removed the specific "325 mg" recommendation because supporting trials used doses in this range) 111
• If patient cannot swallow: use rectal or nasogastric administration 111

Critical Timing Considerations

If the patient received IV alteplase (tPA):

• Generally delay aspirin for 24 hours after thrombolysis 111
• Exception: May give earlier if there's a concomitant condition where withholding aspirin poses substantial risk (e.g., recent coronary stent) 111

If the patient did NOT receive IV alteplase:

• Give aspirin now, within the 24-48 hour window 111

Important Caveats

What Aspirin Cannot Replace

Aspirin is NOT a substitute for acute stroke treatments (Class III: No Benefit recommendation). Do not give aspirin instead of IV alteplase or mechanical thrombectomy in eligible patients 111. The question assumes these acute interventions have already been considered.

Safety Profile in Context

While research shows aspirin carries a small increased risk of intracranial hemorrhage in primary prevention settings (approximately 0.2 events per 1000 patient-years) 23, the benefit-risk ratio in secondary prevention after acute ischemic stroke is clearly favorable 111. The parameters you've confirmed (hemorrhage excluded, adequate platelets, controlled INR and BP) address the key safety concerns.

Minor Stroke Consideration

If this is a minor stroke or high-risk TIA, consider dual antiplatelet therapy (aspirin + clopidogrel for 21 days) instead of aspirin alone, as this provides additional benefit for early secondary stroke prevention up to 90 days (Class IIa recommendation) 111.

Contraindications to Verify

Before administering, confirm no:

• Aspirin allergy or prior severe allergic reaction 4
• Active peptic ulcer disease or recent major GI bleeding 4
• Concurrent use of other anticoagulants (unless specifically indicated) 4