What is the time window for tPA (Alteplase) or Tenecteplase in acute ischemic stroke?

The standard window for intravenous thrombolysis is within 4.5 hours from the patient's last known well time, assuming no contraindications exist.

When is mechanical thrombectomy indicated?

Mechanical thrombectomy is indicated for large vessel occlusion (LVO) strokes in the anterior circulation within 24 hours of symptom onset, depending on core infarct volume matching criteria.

What is the target blood pressure before administering thrombolytics?

Blood pressure must be strictly lowered to below 185/110 mmHg prior to administering thrombolytics to minimize the risk of hemorrhagic transformation.

NeurologyClass I, Level A Evidence (AHA/ASA Guidelines)5 min read

Acute Ischemic Stroke Hyperacute Management: Step-by-Step Guide

Master hyperacute stroke triage, NIHSS scoring, Non-Contrast CT interpretation, IV Thrombolysis window, and Mechanical Thrombectomy.

Bedside Rounds Medical Editorial Board

Stroke Neurology & Neurocritical Care Faculty

Published 2026-07-28

Table of Contents (10 Sections)

High-Res View

Acute Ischemic Stroke Hyperacute Management: Step-by-Step Guide

Clinical Takeaway

⚡ EXECUTIVE CLINICAL SUMMARY - Time is Brain: 1.9 million neurons die every minute during acute ischemic stroke. Door-to-CT target is ≤ 25 minutes. - IV Thrombolysis Window: IV Alteplase / Tenecteplase (TNK) indicated within < 4.5 hours of Last Known Well (LKW). - Mechanical Thrombectomy (EVT) Window: Indicated up to 24 hours for Large Vessel Occlusion (LVO) with CT Perfusion mismatch. - Blood Pressure Target: SBP must be < 185/110 mmHg BEFORE administering IV Thrombolysis (maintain < 180/105 mmHg for 24 hours post-thrombolysis).

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📌 Interactive Table of Contents (Index)

1. Introduction & Stroke Hyperacute Workflow
2. NIHSS Score & Stroke Severity Grid
3. Non-Contrast CT & ASPECTS Scoring
4. Reperfusion Therapy: IV Thrombolysis vs EVT
5. Post-Thrombolysis Blood Pressure Protocol
6. Advanced Perfusion Metrics
7. Flagship Worked Clinical Case Study
8. High-Yield Clinical Pearls & Pitfalls

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1. Introduction & Stroke Hyperacute Workflow

Hyperacute ischemic stroke management requires a rapid multidisciplinary "Stroke Code" response to achieve prompt arterial recanalization.

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2. NIHSS Score & Stroke Severity Grid

The National Institutes of Health Stroke Scale (NIHSS) quantifies neurological deficit severity:

NIHSS Score Range	Stroke Severity Classification	Reperfusion Candidates
0 – 4	Minor / Mild Stroke	Evaluate if disabling symptoms present
5 – 15	Moderate Stroke	Candidate for IV Thrombolysis & EVT
16 – 20	Moderate-to-Severe Stroke	High likelihood of LVO (Large Vessel Occlusion)
21 – 42	Severe Stroke	Urgent EVT candidate; high hemorrhagic risk

NIHSS Score Range:0 – 4

Stroke Severity Classification:Minor / Mild Stroke

Reperfusion Candidates:Evaluate if disabling symptoms present

NIHSS Score Range:5 – 15

Stroke Severity Classification:Moderate Stroke

Reperfusion Candidates:Candidate for IV Thrombolysis & EVT

NIHSS Score Range:16 – 20

Stroke Severity Classification:Moderate-to-Severe Stroke

Reperfusion Candidates:High likelihood of LVO (Large Vessel Occlusion)

NIHSS Score Range:21 – 42

Stroke Severity Classification:Severe Stroke

Reperfusion Candidates:Urgent EVT candidate; high hemorrhagic risk

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3. Non-Contrast CT & ASPECTS Scoring

Initial Non-Contrast CT (NCCT) rules out intracranial hemorrhage and assesses early ischemic changes:

Hyperdense MCA Sign: Represents acute thrombus in the middle cerebral artery.
ASPECTS Score (0–10): 10 regions of MCA territory evaluated. ASPECTS < 6 indicates large established core infarction.

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4. Reperfusion Therapy: IV Thrombolysis vs EVT

Select reperfusion modalities based on Last Known Well (LKW) and LVO status:

Therapy	Target Window	Key Eligibility Criteria	Key Absolute Contraindications
IV Tenecteplase (TNK)	< 4.5 Hours of LKW	Dose 0.25 mg/kg IV bolus (max 25 mg)	Active ICH, SBP >185/110, head trauma <3 mo
Mechanical Thrombectomy	< 24 Hours of LKW	LVO (ICA or M1 MCA) + Penumbral mismatch	Large established core (ASPECTS < 3)

Therapy:IV Tenecteplase (TNK)

Target Window:< 4.5 Hours of LKW

Key Eligibility Criteria:Dose 0.25 mg/kg IV bolus (max 25 mg)

Key Absolute Contraindications:Active ICH, SBP >185/110, head trauma <3 mo

Therapy:Mechanical Thrombectomy

Target Window:< 24 Hours of LKW

Key Eligibility Criteria:LVO (ICA or M1 MCA) + Penumbral mismatch

Key Absolute Contraindications:Large established core (ASPECTS < 3)

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5. Post-Thrombolysis Blood Pressure Protocol

Strict blood pressure control prevents hemorrhagic transformation post-thrombolysis:

Pre-Thrombolysis: Lower BP to < 185/110 mmHg using IV Labetalol 10–20 mg or IV Nicardipine infusion.
Post-Thrombolysis (First 24 Hours): Maintain BP < 180/105 mmHg. Monitor BP q15min × 2 hours, then q30min × 6 hours, then q1h × 16 hours.

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6. Advanced Perfusion Metrics

▶ Ischemic Penumbra vs Infarct Core Ratio

Infarct Core: Tmax > 6.0 sec + CBF < 30% (Irreversibly damaged tissue).
Ischemic Penumbra: Tmax > 6.0 sec with preserved CBF (Salvageable tissue with EVT!).
Mismatch Ratio Target: Penumbra / Core ratio ≥ 1.8 qualifies for extended-window thrombectomy.

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7. Flagship Worked Clinical Case Study

Worked Case: Hyperacute Proximal MCA Occlusion

Case Study

A 64-year-old male presents 90 minutes after sudden onset right hemiplegia, aphasia, and forced left gaze deviation (NIHSS 18). BP is 192/108 mmHg.

#### 📊 Patient Lab & Neuro Panel

Diagnostic Parameter	Measured Value	Reference Range	Diagnostic Interpretation
Blood Pressure	192 / 108 mmHg	120/80 mmHg	Elevated (Exceeds 185/110 cutoff)
NIHSS Score	18 / 42	0	Severe Deficit (LVO Suspected)
NCCT Head	Hyperdense Right MCA	Normal	Acute MCA Thrombus (ASPECTS 9)
CTA Head/Neck	M1 Segment Occlusion	Patent	Large Vessel Occlusion (LVO)
Glucose	118 mg/dL	70–140 mg/dL	Hypoglycemia mimic excluded

Diagnostic Parameter:Blood Pressure

Measured Value:192 / 108 mmHg

Reference Range:120/80 mmHg

Diagnostic Interpretation:Elevated (Exceeds 185/110 cutoff)

Diagnostic Parameter:NIHSS Score

Measured Value:18 / 42

Reference Range:0

Diagnostic Interpretation:Severe Deficit (LVO Suspected)

Diagnostic Parameter:NCCT Head

Measured Value:Hyperdense Right MCA

Reference Range:Normal

Diagnostic Interpretation:Acute MCA Thrombus (ASPECTS 9)

Diagnostic Parameter:CTA Head/Neck

Measured Value:M1 Segment Occlusion

Reference Range:Patent

Diagnostic Interpretation:Large Vessel Occlusion (LVO)

Diagnostic Parameter:Glucose

Measured Value:118 mg/dL

Reference Range:70–140 mg/dL

Diagnostic Interpretation:Hypoglycemia mimic excluded

#### ⚡ Step-by-Step Clinical Decision Flowchart

Step 1: BP Management    → Give IV Labetalol 20 mg IV push to lower BP below 185/110 (Reaches 172/94 mmHg)
Step 2: IV Thrombolysis  → Administer IV Tenecteplase (TNK) 0.25 mg/kg bolus at 105 min post-LKW
Step 3: Cath Activation  → Direct transfer to Angio Suite for Endovascular Thrombectomy (EVT)
Step 4: Recanalization   → Successful TICI 3 recanalization achieved at 155 minutes post-LKW
Step 5: Post-EVT Target  → Maintain SBP < 180/105 mmHg for 24 hours + Repeat NCCT at 24 hours

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8. High-Yield Clinical Pearls & Pitfalls

Clinical Takeaway

💡 Attending Pearls for Ward Rounds: - Always Check Blood Glucose: Hypoglycemia (< 60 mg/dL) can perfectly mimic acute focal stroke deficits. Always check fingerstick glucose first! - Do Not Delay TNK for CTA/Perfusion: Give IV Thrombolysis immediately after NCCT rules out hemorrhage while transporting the patient to the CTA/EVT suite. - Watch for Sudden Deterioration Post-TPA: Sudden severe headache, acute nausea, or BP spike post-thrombolysis indicates Hemorrhagic Transformation—stop infusion immediately and order stat NCCT!

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Interactive Simulation Available

Test Your Decision-Making in Hyperacute MCA Stroke with Large Vessel Occlusion

Experience this exact clinical scenario in the Bedside Rounds interactive simulator. Order investigations, manage door-to-needle timing, and witness real-time physiological feedback.

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