10.2 Pediatric Arterial Stroke, Intracerebral Hemorrhage & CSVT
Key Takeaways
Activate pediatric stroke evaluation for sudden persistent focal findings. Check glucose, document onset and consider age-specific presentations and mimics.
Use urgent MRI/MRA or CT/CTA when MRI cannot be obtained promptly. A normal noncontrast CT does not exclude acute ischemic stroke. Add venography for suspected CSVT.
Under 2026 AHA/ASA guidance, specialists may consider alteplase for confirmed disabling AIS within 4.5 hours and thrombectomy for selected confirmed large-vessel occlusions.
Primary intracerebral hemorrhage requires prompt vascular imaging, neurosurgical assessment and management of pressure and bleeding. Venous hemorrhagic infarction follows the CSVT pathway.
Arrange prompt transfusion for acute focal deficits in sickle cell disease. In CSVT, hemorrhage from venous congestion can coexist with an indication for anticoagulation.
Pediatric Arterial Stroke, Intracerebral Hemorrhage and CSVT
Quick Answer: Activate the pediatric stroke team for a sudden focal deficit, including persistent weakness after a seizure. Record onset and last known well, check glucose and obtain urgent brain and vascular imaging. A normal noncontrast CT does not exclude ischemia. Treatment differs for arterial ischemia, primary hemorrhage and venous thrombosis. In sickle cell disease, arrange urgent transfusion in parallel with evaluation.
Recognize Stroke and Consider the Mechanism
Neonatal arterial ischemic stroke often presents with focal seizures. Some perinatal strokes are recognized later when an infant develops unusually early hand preference or asymmetric motor function. In older children, look for abrupt unilateral weakness, facial asymmetry, language or speech disturbance, visual field loss or neglect. Ataxia, diplopia or altered consciousness can suggest posterior circulation involvement. Seizure may accompany stroke. Check glucose and consider migraine with motor aura, postictal paresis, demyelination, infection and functional symptoms while the stroke evaluation proceeds. Use PedNIHSS to document baseline severity and change in age-appropriate patients. Its interrater reliability was studied in children aged 2–18 years with AIS. The score is not a diagnostic test or a standalone treatment gate. AHA pediatric stroke statement · PedNIHSS study
| Mechanism or risk factor | Findings that change evaluation |
|---|---|
| Arteriopathy | Focal cerebral arteriopathy can present as unilateral stenosis of proximal anterior circulation arteries. A recent infection, including varicella, can be a clue. Moyamoya causes progressive terminal internal carotid stenosis with fragile collaterals, sometimes in association with sickle cell disease, trisomy 21 or NF1. Head or neck trauma and neck pain may point to cervical arterial dissection. Image the relevant intracranial and cervical vessels. |
| Cardiac disease | Consider intracardiac thrombus, endocarditis, recent cardiac intervention or mechanical support. A right-to-left route can allow a venous clot to reach systemic arteries. In Fontan circulation, a fenestration may provide that route. Check the child's current anatomy and repair and distinguish paradoxical embolism from cardiac thrombus or perioperative injury. |
| Hematologic and systemic factors | Sickle cell anemia, selected thrombophilias, infection and inflammatory disease can contribute. Pursue targeted testing in consultation with neurology and hematology. More than one factor may coexist. |
The International Pediatric Stroke Study reported cardiac disorders in 31% and infections in 24% in its reported risk-factor results. A companion analysis found arteriopathy in 277 of 525 children with vascular imaging (53% rounded), among 667 cases with clinical data from the 676 enrolled non-neonatal cases. The chart uses only the vascular-imaging cohort. The risk factors can overlap. IPSS risk factor study · IPSS vascular imaging analysis
Stabilize and Image Without Delay
Activate the stroke pathway, check airway and circulation, obtain glucose, document onset or last known well and perform serial focused examinations. Prevent hypoxemia and hypotension, correct hypoglycemia, treat fever and seizures when present and maintain appropriate hydration. Use stroke-team blood pressure goals based on age, perfusion, stroke type and planned intervention. Avoid rapid empiric pressure reduction in suspected ischemia. CHOP stroke pathway · 2026 pediatric institutional AIS pathway
- Suspected AIS: The 2026 AHA/ASA guideline supports emergent MRI with MRA of cervical and intracranial vessels. Include diffusion-weighted imaging and ADC to identify restricted diffusion and a blood-sensitive sequence to evaluate hemorrhage. When MRI/MRA cannot be obtained promptly (within about 25 minutes in the guideline) or is contraindicated, obtain CT with CTA of the head and neck using a pediatric protocol. Noncontrast CT quickly assesses hemorrhage. An initially normal CT cannot rule out infarction. Persistent concern after nondiagnostic CT/CTA warrants urgent MRI when feasible. Coordinate imaging and reperfusion decisions in parallel. 2026 AHA/ASA AIS guideline, section 3.2
- Suspected venous stroke: Order MR venography or CT venography when the presentation suggests sinus or cortical vein thrombosis. A standard arterial angiographic sequence is insufficient to evaluate the venous system reliably. AHA pediatric stroke statement
Acute Arterial Ischemic Stroke
Consider reperfusion with pediatric stroke specialists
| Decision | 2026 AHA/ASA pediatric guidance |
|---|---|
| IV alteplase | May be considered for confirmed AIS with disabling deficits within 4.5 hours in patients aged 28 days to 18 years. Observational data suggest acceptable safety in selected children. Efficacy is uncertain. The recommendation does not establish a fixed PedNIHSS score gate. |
| Mechanical thrombectomy, ages 6–17 years | With symptomatic AIS from a confirmed large-vessel occlusion, EVT can be effective within 6 hours with experienced neurointervention. At 6–24 hours, also assess for potentially salvageable tissue. |
| Mechanical thrombectomy, younger children | The guideline's treatment figure groups ages 28 days through 5 years here. With symptomatic AIS from large-vessel occlusion, potentially salvageable tissue and onset within 24 hours, EVT may be reasonable with pediatric-experienced neurointervention. |
The stroke team assesses bleeding risk, infarct extent, potentially salvageable tissue, mechanism, anatomy and local capability before reperfusion. Pediatric perfusion selection thresholds are not established as they are in adults. TIPS closed because of low enrollment, and subsequent observational cohorts inform safety and selection. The U.S. Activase label states pediatric safety and effectiveness are unestablished. When selected under a pediatric pathway, alteplase uses 0.9 mg/kg IV (max 90 mg), with 10% over one minute and the remainder over 60 minutes. A 40-kg example is 36 mg total, 3.6 mg bolus and 32.4 mg by infusion. The label's AIS treatment window is three hours. The 4.5-hour pediatric guideline window reflects clinical guidance for selected use. Use the stroke pathway for pressure and neurologic monitoring. Standard post-thrombolysis monitoring includes follow-up CT or MRI at about 24 hours before starting antithrombotic therapy. Apply the pediatric pathway and specialist plan. 2026 AHA/ASA AIS guideline, sections 4.6.1 and 4.7.5 · TIPS study · TIPSTER alteplase cohort · Save ChildS Pro · U.S. Activase label
Choose secondary prevention by mechanism
After hemorrhage and reperfusion decisions, discuss timing with pediatric neurology. Aspirin is commonly used in noncardioembolic AIS without severe thrombophilia. One U.S. pediatric pathway uses 3–5 mg/kg/day initially. Selected cardioembolic cases, high-risk thrombophilia and some extracranial dissections may warrant anticoagulation. Infarct burden and hemorrhagic transformation can change timing. Moyamoya warrants specialized evaluation for revascularization. Investigate the cause and start rehabilitation planning with the multidisciplinary team. 2019 AHA pediatric stroke statement · 2026 Johns Hopkins All Children's pathway
Sickle cell disease
For new focal deficits or TIA in sickle cell disease, activate stroke and hematology teams and arrange transfusion promptly, ideally within two hours of presentation to medical care. Exchange is preferred. If exchange cannot be arranged within two hours and hemoglobin is 8.5 g/dL or lower, simple transfusion toward approximately 10 g/dL can bridge to exchange. Above 8.5 g/dL, favor exchange to limit hyperviscosity. Typical post-apheresis targets in ASH guidance are HbS 15–20% and hemoglobin about 10 g/dL. The team individualizes the targets. In children with prior ischemic stroke and HbSS or HbSβ⁰ thalassemia, chronic secondary prevention aims for hemoglobin above 9 g/dL and HbS below 30% until the next transfusion. Coordinate urgent imaging and transfusion without treating a normal initial scan as exclusion of ischemia. ASH cerebrovascular guideline
For primary prevention, screen children aged 2–16 years with HbSS or HbSβ⁰ thalassemia annually by transcranial Doppler (TCD). In the distal internal carotid or proximal middle cerebral artery, ASH uses two nonimaging velocity measurements at least 200 cm/s or one over 220 cm/s. Imaging TCD uses lower thresholds (two at least 185 cm/s or one over 205 cm/s). A qualifying high-risk study prompts hematology assessment for regular transfusions, distinct from urgent treatment of new deficits. ASH cerebrovascular guideline · STOP prevention trial
Primary Intracerebral Hemorrhage
Suspect hemorrhage with abrupt headache, vomiting, depressed consciousness, focal deficit or seizure. In children, structural vascular lesions such as arteriovenous malformations are important causes. Coagulopathy, tumors and other causes also occur. After stabilization, obtain urgent CT/CTA or MRI/MRA depending on availability and patient factors. Consult neurosurgery and neurointervention promptly. If initial vascular imaging does not explain the bleed or shows a lesion needing characterization, the team may use catheter angiography. Reverse a relevant coagulopathy, treat seizures, monitor for hydrocephalus and raised intracranial pressure, and manage blood pressure carefully while preserving cerebral perfusion. Reassess urgently with deterioration. Ventricular drainage or hematoma intervention depends on location, mass effect, hydrocephalus and clinical course. International Pediatric Stroke Organization acute ICH consensus
Cerebral Sinovenous Thrombosis (CSVT)
Impaired venous drainage can cause intracranial hypertension, edema and venous infarction, sometimes with hemorrhage. Consider CSVT with headache, vomiting, papilledema, abducens palsy, seizures or focal deficits, particularly with mastoiditis or sinus infection, dehydration, malignancy or prothrombotic treatment. Confirm with MRV or CTV. Treat infection with IV antimicrobials and arrange urgent ENT or neurosurgical assessment for source control when appropriate. Assess and monitor pressure and vision. AHA pediatric stroke statement · Infection-related pediatric CVT cohort
The 2024 ASH/ISTH update, published in 2025, conditionally favors anticoagulation in pediatric CSVT with or without hemorrhage due to venous congestion and favors anticoagulation alone over routine thrombolysis. A small venous hemorrhagic infarct does not automatically preclude anticoagulation. Other active bleeding, recent trauma or surgery and a planned procedure affect timing and agent choice. Discuss with hematology and relevant surgical teams. LMWH or UFH are parenteral options. UFH may suit a situation where rapid interruption is important. Follow clinical and venous imaging response. Selected low-risk provoked cases may qualify for a shorter course after reassessment. Persistent occlusion, ongoing risks and recurrence call for individualized duration. ASH/ISTH pediatric VTE guideline · Kids-DOTT CSVT subgroup
An 8-year-old with HbSS has sudden right hemiparesis and aphasia. Hemoglobin is 6.8 g/dL. Imaging confirms left middle cerebral artery territory ischemia. The stroke and hematology teams can start red cell exchange immediately. What is the best transfusion strategy?
Give a large simple red cell transfusion to raise hemoglobin to 14 g/dL.
Delay all blood products for 24 hours while following serial neurologic examinations.
Obtain lumbar puncture to measure pressure before selecting a transfusion strategy.
Start urgent red cell exchange to reduce HbS while avoiding an excessive rise in viscosity.
A 14-year-old with mastoiditis develops severe headache, vomiting, papilledema and an abducens palsy. MR venography shows extensive transverse and sigmoid sinus thrombosis with a small venous hemorrhagic infarct. The child is stable and has no other bleeding. ENT is assessing the need and timing for drainage. What management plan best fits?
Start IV antimicrobials and coordinate source control. Plan therapeutic anticoagulation with hematology and ENT, accounting for procedural timing.
Exclude anticoagulation because any blood on imaging makes it inappropriate for venous thrombosis.
Use aspirin alone for the venous clot and arrange routine outpatient assessment of the infection.
Proceed directly to systemic thrombolysis before treating the infection.
A 16-year-old presents two hours after sudden aphasia and dense right-sided weakness. Glucose is normal, and noncontrast CT shows no hemorrhage or established infarct. MRI/MRA cannot be obtained promptly and head and neck CTA is immediately available. The focal deficits persist. What is the most appropriate next action?
Discharge with a diagnosis of migraine because the noncontrast CT is normal.
Continue the pediatric stroke response, obtain urgent CTA and assess reperfusion eligibility with the stroke team.
Lower the blood pressure rapidly to below 110/70 mmHg before arranging additional imaging.
Give therapeutic heparin empirically before evaluating the arterial circulation.
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