Stroke Reperfusion Injury

After intravenous thrombolysis or mechanical thrombectomy, promptly reassess any new or worsening focal deficit, reduced consciousness, headache, vomiting, or seizure with repeat NIHSS assessment and urgent noncontrast head CT. The immediate differential includes hemorrhagic transformation, large space-occupying infarction with edema, recurrent or persistent ischemia, and thrombectomy-related complications. NeurologyNeurologyComplications of Mechanical Thrombectomy in Acute Ischemic Stroke

Noncontrast CT remains the definitive test for distinguishing ischemic from hemorrhagic stroke in acute evaluation. When the CT does not explain ongoing deterioration and recurrent arterial occlusion or incomplete reperfusion remains plausible, obtain vascular imaging as dictated by the local acute-stroke pathway; CT perfusion has high sensitivity for ischemic stroke but is less reliable in reperfused stroke and lacunar infarction. AHA Journals+1AHA JournalsPart 7: The Era of Reperfusion : Section 2: Acute StrokeAHA JournalsUse of Imaging to Guide Eligibility for Reperfusion ...

Escalate patients with declining consciousness, radiographic mass effect, substantial hemorrhage, or concern for elevated intracranial pressure to a neurocritical-care setting and engage neurosurgery early. Reperfusion hemorrhage, cerebral edema, and large space-occupying infarcts are post-thrombectomy complications for which early recognition can enable lifesaving therapy. NeurologyNeurologyComplications of Mechanical Thrombectomy in Acute Ischemic Stroke

Hemorrhagic transformation is radiographic blood within infarcted brain and reflects blood-brain barrier disruption in ischemic tissue; reperfusion therapy can facilitate or amplify this process. Reperfusion injury includes oxidative stress, inflammatory activation, basal-lamina disruption, platelet and complement activation, and leukocyte infiltration, which together increase vascular permeability and bleeding risk. PubMed+1PubMedHemorrhagic Transformation After Ischemic Stroke: Mechanisms and Management - PMCAHA JournalsBlood–Brain Barrier Disruption, Vascular Impairment, and ...

Classify the hemorrhage with a structured system such as the Heidelberg Bleeding Classification, while correlating the imaging finding with the neurologic examination. For clinical-impact assessment, ECASS and SITS-MOST definitions identify hemorrhage associated with at least a 4-point NIHSS worsening; this threshold is more likely to capture hemorrhage that affects long-term outcome than purely radiographic bleeding. Wolters Kluwer+1Wolters KluwerThe Heidelberg Bleeding Classification : StrokeNeurologyComplications of Mechanical Thrombectomy in Acute Ischemic Stroke

Give particular weight to parenchymal hematoma type 2. A PH2 lesion occupying more than 30% of the infarcted area is the hemorrhagic-transformation subtype reported to significantly alter clinical course and is associated with neurologic deterioration, higher mortality, and poor 3-month outcome. NeurologyNeurologyComplications of Mechanical Thrombectomy in Acute Ischemic Stroke

After reperfusion, cerebral edema and large space-occupying infarction require active surveillance because they are recognized complications after mechanical thrombectomy and can cause coma or herniation. Repeat CT when consciousness worsens or the examination suggests rising intracranial pressure; imaging should assess infarct extent, sulcal effacement, ventricular compression, basal-cistern patency, and midline shift. Neurology+1NeurologyComplications of Mechanical Thrombectomy in Acute Ischemic StrokeAHA JournalsPart 7: The Era of Reperfusion : Section 2: Acute Stroke

A trial definition of malignant brain edema uses parenchymal hypodensity involving at least 50% of the middle cerebral artery territory plus local swelling, with midline shift of at least 5 mm at the septum pellucidum or pineal gland and obliteration of basal cisterns. These features should prompt urgent neurosurgical evaluation rather than continued observation alone. clinicaltrialsclinicaltrialsStudy Details | NCT05920889 | Glucagon-like Peptide 1 Receptor Agonist in Acute Large Vessel Occlusion Stroke Treated by Reperfusion Therapies | ClinicalTrials.gov

For selected patients aged 60 years or younger with malignant middle cerebral artery infarction, urgent neurosurgical assessment for decompressive hemicraniectomy is strongly recommended, with surgery ideally performed within 48 hours of stroke onset. In selected patients older than 60 years, hemicraniectomy may be considered after explicit appraisal of premorbid function and patient preferences. WHOWHOSummary of the recommendations 2017

Measure blood pressure frequently during the first 24 hours after thrombectomy or intravenous thrombolysis and address sustained elevation according to the active institutional acute-stroke protocol. Higher systolic blood pressure after thrombectomy is associated with poorer outcome, and higher systolic pressure is a predictor of symptomatic intracranial hemorrhage after thrombectomy. Wolters Kluwer+1Wolters KluwerPredictors of Symptomatic Intracranial Hemorrhage... : Cerebrovascular DiseasesAHA JournalsSystolic Blood Pressure Within 24 Hours After Thrombectomy for Acute Ischemic Stroke Correlates With Outcome

Avoid assuming that more intensive blood pressure lowering is automatically safer after successful reperfusion. Randomized trials have compared intensive versus standard post-reperfusion blood pressure strategies, and the appropriate target depends on the balance between hemorrhagic risk and perfusion dependence in injured tissue with impaired autoregulation. ScienceDirect+1ScienceDirectEfficacy and Safety of Intensive Blood Pressure Lowering After Reperfusion Therapy in Acute Ischemic Stroke: A Systematic Review and Meta-Analysis - ScienceDirectAHA JournalsSystolic Blood Pressure Within 24 Hours After Thrombectomy for Acute Ischemic Stroke Correlates With Outcome

Check serum or capillary glucose as part of post-reperfusion surveillance, particularly in patients with diabetes. Diabetes predicted symptomatic intracranial hemorrhage after thrombectomy, and dysglycemia has been linked to blood-brain barrier injury that can aggravate hemorrhage after reperfusion. Wolters KluwerWolters KluwerPredictors of Symptomatic Intracranial Hemorrhage... : Cerebrovascular Diseases

Acute ischemic stroke treatment is time dependent: intravenous thrombolysis and endovascular therapy are intended to restore flow to potentially reversible hypoperfused tissue before infarction becomes established. The decision to reperfuse should therefore remain anchored in the acute-stroke eligibility assessment, imaging, and expected benefit rather than in nonspecific fear of hemorrhagic transformation. AHA Journals+1AHA JournalsGuidelines for the Early Management of Patients With ...ScienceDirectManagement of acute ischemic stroke - ScienceDirect

Reperfusion can produce hemorrhage and edema through blood-brain barrier disruption and inflammatory injury, but not all reperfused infarcts develop hematoma. Risk is increased by clinical features such as older age, diabetes, higher NIHSS score, and higher systolic pressure after thrombectomy; these factors support intensified post-treatment monitoring rather than retrospective therapeutic nihilism. Wolters Kluwer+1Wolters KluwerPredictors of Symptomatic Intracranial Hemorrhage... : Cerebrovascular DiseasesPubMedHemorrhagic Transformation After Ischemic Stroke: Mechanisms and Management - PMC

When severe ipsilateral carotid stenosis is the likely source of a recent ischemic stroke, guideline-based practice favors revascularization within 2 weeks. This secondary-prevention decision is separate from management of acute reperfusion injury, but it should be revisited once the patient has stabilized and hemorrhagic or edema-related complications have been characterized. AHA JournalsAHA JournalsPostcarotid Endarterectomy Reperfusion Injury and ...