What is the step‑by‑step protocol for the acute management of an ischemic stroke, including assessment, imaging, eligibility for intravenous alteplase (tPA) and endovascular thrombectomy, and post‑treatment monitoring?

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Last updated: October 27, 2026 • View editorial policy

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Acute Ischemic Stroke Management Protocol

For acute ischemic stroke, immediately activate stroke protocols with door-to-imaging within 20 minutes and door-to-needle within 60 minutes, prioritizing IV alteplase (0.9 mg/kg, max 90 mg) for eligible patients within 4.5 hours of symptom onset, with consideration for endovascular thrombectomy in large vessel occlusions up to 24 hours when salvageable tissue is present. 1

Step 1: Immediate Assessment and Stabilization (Door-to-Imaging Goal: ≤20 minutes)

Initial Evaluation

  • Time of onset determination: Document exact time of symptom onset or last known well/baseline neurological state. If uncertain or wake-up stroke, use the time patient was last known normal 1
  • NIHSS score: Quantify stroke severity immediately
  • Vital signs: Focus on blood pressure, temperature, glucose, oxygen saturation
  • Brief focused history: Current medications (especially anticoagulants, antiplatelets), recent surgeries, bleeding history, seizure at onset

Critical Laboratory Tests (Obtain Immediately)

  • Blood glucose (must be >50 mg/dL for tPA eligibility) 1
  • Complete blood count with platelets
  • PT/INR, aPTT
  • Basic metabolic panel including creatinine
  • Troponin and ECG

Pitfall: Do not delay imaging for laboratory results unless patient is on anticoagulants or has known coagulopathy 1

Step 2: Emergent Neuroimaging (Within 20 Minutes of Arrival)

Initial Imaging

  • Non-contrast CT head: Rule out hemorrhage, assess for early ischemic changes
    • Mild-to-moderate early ischemic changes do NOT contraindicate tPA 1
    • Frank hypodensity or >1/3 MCA territory involvement in 3-4.5 hour window is a contraindication 1

Advanced Imaging (For Extended Windows or EVT Consideration)

  • CT angiography: Identify large vessel occlusion
  • CT perfusion or MRI with DWI-FLAIR: For patients in extended windows (4.5-24 hours) to identify salvageable tissue 2

Step 3: IV Alteplase Eligibility Assessment

Class I Indications (MUST TREAT if no contraindications) 1

0-3 Hour Window:

  • Age ≥18 years (both <80 and ≥80 years equally recommended)
  • Any stroke severity including severe symptoms
  • BP controllable to <185/110 mmHg
  • Glucose >50 mg/dL
  • Prior antiplatelet monotherapy or combination therapy acceptable
  • End-stage renal disease on hemodialysis with normal aPTT acceptable

3-4.5 Hour Window (Additional Restrictions):

  • Age ≤80 years
  • NIHSS ≤25
  • No history of BOTH diabetes AND prior stroke
  • Not taking oral anticoagulants
  • No imaging evidence of >1/3 MCA territory involvement

Extended Window (4.5-24 Hours):

  • Recent evidence from the HOPE trial 2 demonstrates benefit with perfusion imaging showing salvageable tissue, though this represents emerging practice beyond current 2018 AHA/ASA guidelines 1

Absolute Contraindications 1

  • Unclear or unwitnessed symptom onset >3 or 4.5 hours (unless extended window imaging criteria met)
  • Active internal bleeding
  • Intracranial hemorrhage on imaging
  • BP persistently >185/110 mmHg despite treatment

Step 4: Blood Pressure Management Pre-tPA

Target: <185/110 mmHg before initiating alteplase 1

  • Labetalol 10-20 mg IV over 1-2 minutes, may repeat once; OR
  • Nicardipine infusion 5 mg/hour, titrate up by 2.5 mg/hour every 5-15 minutes to max 15 mg/hour
  • Assess BP stability before starting tPA 1

Step 5: IV Alteplase Administration 1

Dosing: 0.9 mg/kg (maximum 90 mg)

  • 10% as IV bolus over 1 minute
  • Remaining 90% as continuous infusion over 60 minutes

Immediate Actions:

  • Admit to intensive care or stroke unit
  • Do NOT place nasogastric tubes, indwelling bladder catheters, or intra-arterial pressure catheters during infusion unless absolutely necessary 1
  • Withhold antiplatelet and anticoagulant therapy for 24 hours 1

Step 6: Post-tPA Monitoring Protocol 1

Neurological and Vital Sign Monitoring

  • Every 15 minutes during and for 2 hours after tPA infusion
  • Every 30 minutes for next 6 hours
  • Hourly until 24 hours post-treatment

Blood Pressure Management Post-tPA

Target: <180/105 mmHg for at least 24 hours 1

If BP >180/105 mmHg:

  • Increase monitoring frequency
  • Administer antihypertensive medications to maintain target

Signs Requiring Immediate Action

STOP infusion immediately if:

  • Severe headache
  • Acute hypertension
  • Nausea/vomiting
  • Worsening neurological examination

Then:

  • Obtain emergency head CT
  • Send CBC, PT/INR, aPTT, fibrinogen, type and cross-match 1

Step 7: Management of Symptomatic Intracranial Hemorrhage 1

If hemorrhage confirmed:

  1. Stop alteplase infusion
  2. Cryoprecipitate: 10 units IV over 10-30 minutes; additional dose if fibrinogen <200 mg/dL
  3. Tranexamic acid: 1000 mg IV over 10 minutes OR ε-aminocaproic acid 4-5 g over 1 hour
  4. Consult hematology and neurosurgery immediately
  5. Supportive care: BP management, ICP monitoring, temperature and glucose control

Step 8: Endovascular Thrombectomy Consideration

Evaluate simultaneously with tPA eligibility - do not delay tPA while arranging EVT 1

EVT Indications

  • Large vessel occlusion (ICA, M1, M2, basilar artery)
  • Time window up to 24 hours with salvageable tissue on perfusion imaging
  • NIHSS typically ≥6
  • Pre-stroke mRS 0-1

Key Point: tPA should be given first if eligible, even if EVT is planned (bridging therapy) 1

Step 9: 24-Hour Post-Treatment Management

Follow-up Imaging

Obtain CT or MRI at 24 hours before starting anticoagulants or antiplatelet agents 1

Antithrombotic Therapy Initiation

  • Wait 24 hours after tPA before starting antiplatelet or anticoagulant therapy 1
  • Exception: May consider earlier if compelling indication where withholding poses substantial risk (Class IIb recommendation) 1

Secondary Prevention

  • Initiate statin therapy
  • Evaluate for cardioembolic source
  • Assess for carotid stenosis
  • Screen for dysphagia before oral intake

Critical Pitfalls to Avoid

  1. Time delays: Every minute matters - "time is brain." Door-to-needle should be <60 minutes 1
  2. Overestimating contraindications: Many relative contraindications (age >80, severe stroke, prior antiplatelet use) are NOT absolute contraindications in the 0-3 hour window 1
  3. Waiting for all labs: Do not delay imaging or treatment for non-essential laboratory results
  4. Excessive catheter manipulation: Avoid vigorous suction or excessive pressure that could dislodge clot 3
  5. Premature antithrombotic therapy: Wait full 24 hours and obtain follow-up imaging before starting antiplatelet/anticoagulant therapy 1
  6. Missing EVT candidates: Assess for large vessel occlusion even while administering tPA 1

References

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