What is the recommended acute management of an ischemic stroke?

Management of Acute Ischaemic Stroke

For eligible patients with acute ischemic stroke, immediately administer IV alteplase (0.9 mg/kg, maximum 90 mg) within 3 hours of symptom onset, or up to 4.5 hours in selected patients, and perform mechanical thrombectomy for large vessel occlusions—time is brain, and treatment must be initiated as rapidly as possible. 1

Immediate Assessment and Time-Critical Actions

The cornerstone of acute ischemic stroke management is rapid reperfusion therapy, with outcomes directly tied to how quickly treatment begins. Every minute of delay results in irreversible brain damage.

Intravenous Thrombolysis with Alteplase

Within 0-3 Hours:

• Administer IV alteplase 0.9 mg/kg (maximum 90 mg) over 60 minutes, with 10% given as bolus over 1 minute 1
• This is a Class I, Level A recommendation for all eligible patients ≥18 years, regardless of age (<80 or >80 years) 1
• Even patients with severe stroke symptoms should receive alteplase despite increased hemorrhagic risk, as clinical benefit is proven 1

Within 3-4.5 Hours:

• Alteplase remains indicated but with additional exclusion criteria: patients must be ≤80 years, without both diabetes AND prior stroke, NIHSS ≤25, not on oral anticoagulants, and without imaging showing >1/3 MCA territory involvement 1
• This is Class I, Level B-R evidence 1

The 2026 AHA/ASA guidelines reinforce that thrombolytic therapy remains a cornerstone of acute stroke management, with recent evidence supporting expanded eligibility 2. European guidelines similarly provide high-quality evidence for alteplase within 4.5 hours and even in wake-up strokes with DWI-FLAIR mismatch 3.

Critical Eligibility Requirements

Blood Pressure:

• Must be safely lowered to <185/110 mmHg before starting alteplase 1
• Maintain <180/105 mmHg during and for 24 hours after infusion 1

Blood Glucose:

• Treat patients with glucose >50 mg/dL 1

Prior Antiplatelet Use:

• Patients on aspirin monotherapy should receive alteplase (benefit outweighs small increased sICH risk) 1
• Patients on dual antiplatelet therapy (aspirin + clopidogrel) should also receive alteplase despite probable increased sICH risk 1

Imaging:

• Alteplase is indicated with mild-to-moderate early ischemic changes on non-contrast CT (not frank hypodensity) 1

Mechanical Thrombectomy

For large vessel occlusions, perform endovascular thrombectomy as the standard of care 4. This applies to both anterior and posterior circulation strokes, with boundaries for treatment expanding based on recent evidence 4.

Blood Pressure Management During Thrombectomy:

• Maintain BP ≤180/105 mmHg during and for 24 hours after the procedure 1
• After successful reperfusion, consider maintaining BP <180/105 mmHg 1
• The ESCAPE protocol suggests systolic BP ≥150 mmHg may promote collateral flow while the artery remains occluded, but normal BP should be targeted once reperfusion is achieved 1

Sedation Approach:

• Either general anesthesia or conscious sedation is reasonable—neither shows clear superiority in available RCTs 1

Antiplatelet Therapy

Administer aspirin 160-300 mg within 24-48 hours after stroke onset 1. This is a Class I, Level A recommendation based on large clinical trials and Cochrane review 1.

Critical Timing with Alteplase:

• For patients who received IV alteplase, delay aspirin for 24 hours 1
• However, aspirin might be considered earlier if there are concomitant conditions where withholding treatment poses substantial risk 1

The risk of early antithrombotic therapy within 24 hours after alteplase (with or without thrombectomy) is uncertain, though retrospective data suggest no increased hemorrhage risk with early initiation 1. Recent meta-analysis confirms reperfusion therapies are not associated with increased recurrent stroke or thrombotic events within 90 days 5.

Blood Pressure Management

In Acute Phase Without Reperfusion Therapy:

• Do not routinely lower BP unless systolic ≥220 mmHg or diastolic ≥120 mmHg 6
• If lowering is needed, reduce by only ~15% within 24 hours 6

With Reperfusion Therapy:

• Pre-treatment: <185/110 mmHg 1
• During/after: <180/105 mmHg for 24 hours 1, 6

Post-Thrombolysis Monitoring

Intensive monitoring protocol 1:

• Neurological assessments and BP checks every 15 minutes during and for 2 hours after alteplase
• Then every 30 minutes for 6 hours
• Then hourly until 24 hours
• Increase frequency if BP exceeds target

If patient develops severe headache, acute hypertension, nausea, vomiting, or neurological worsening:

• Stop alteplase immediately
• Obtain emergency head CT
• Manage symptomatic ICH with cryoprecipitate (10 units), tranexamic acid (1000 mg IV over 10 min), and supportive care 1

Critical Pitfalls to Avoid

1. Do not delay treatment for additional diagnostic studies if basic eligibility is established 1
2. Do not withhold alteplase from patients >80 years within 3-hour window—age is not a contraindication 1
3. Do not give aspirin within 24 hours of alteplase unless compelling indication 1
4. Do not place nasogastric tubes, bladder catheters, or arterial lines immediately after alteplase if patient can be safely managed without them 1
5. Obtain follow-up CT/MRI at 24 hours before starting anticoagulants or antiplatelets 1

Emerging Evidence

Tenecteplase is emerging as an alternative to alteplase, with ongoing research supporting its role in acute stroke management 4. The 2026 guidelines incorporate new evidence on thrombolytic choice and expanded eligibility criteria 2.