Management of Ischemic Core Infarct in the Left Middle Cerebral Artery

Initial Assessment and Diagnosis

Clinical predictors of malignant course include high stroke severity scores, nausea/vomiting, and progressive neurological deterioration, according to the American College of Cardiology 1
Radiological assessment should include Non-contrast CT to rule out hemorrhage and estimate ischemic core using ASPECTS score, as recommended by the American College of Cardiology 2
CT angiography should be used to confirm MCA occlusion and assess collateral circulation, as recommended by the American College of Cardiology 2
Diffusion-weighted MRI is the gold standard for ischemic core assessment and should be used when available, as recommended by the American College of Cardiology 2
Large infarct cores (ASPECTS ≤6) on initial imaging indicate higher risk of malignant progression and hemorrhagic transformation, according to the American College of Cardiology and the American Heart Association 2, 3
Multiphase CT angiography can provide valuable information about collateral circulation, which is an independent predictor of outcome, as recommended by the American College of Cardiology 2

For patients presenting within the treatment window, intravenous thrombolysis with alteplase should be administered within 4.5 hours if no contraindications exist, as recommended by the American Heart Association 4
Mechanical thrombectomy is strongly recommended for patients with proximal MCA occlusion, particularly those with small-to-moderate ischemic cores (ASPECTS ≥6), according to the American Heart Association 4, 5
For patients with large ischemic cores (ASPECTS <6), mechanical thrombectomy may still be beneficial but carries higher risk of hemorrhagic transformation, as reported by the American Heart Association 5, 2
Blood pressure management is critical, with a target of ≤180/105 mmHg during and for 24 hours after mechanical thrombectomy, as recommended by the American Heart Association 4
Antiplatelet therapy with aspirin (160-300 mg) is recommended within 24-48 hours after stroke onset, as recommended by the American Heart Association 4

Early transfer to a center with neurosurgical expertise and neuromonitoring capabilities is recommended for patients with signs of large MCA infarction, according to the American College of Cardiology 1
Initial medical management includes elevating the head of bed to 30 degrees, restricting free water, and avoiding hypotonic fluids, as recommended by the American College of Cardiology 1
Osmotic therapy with mannitol or hypertonic saline is reasonable for patients with clinical deterioration from cerebral swelling, targeting serum osmolarity of 315-320 mOsm/L, as recommended by the American College of Cardiology 1

Decompressive craniectomy with dural expansion is the most effective intervention for malignant MCA infarction, reducing mortality by approximately 50% in patients ≤60 years, as reported by the American College of Cardiology 1
Optimal timing for decompressive craniectomy is within 48 hours of stroke onset, before severe neurological deterioration occurs, as recommended by the American College of Cardiology 1
The procedure should include a large bone flap (at least 12 cm diameter), extension down to the temporal skull base, and wide dural opening, as recommended by the American College of Cardiology 1

Hemorrhagic transformation is a common complication of severe stroke and is associated with blood-brain barrier disruption, as reported by the American Heart Association 3
The risk of hemorrhagic transformation increases with large infarct size, use of thrombolytic agents, and reperfusion of severely damaged tissue, as reported by the American Heart Association 3
Transcranial Doppler sonography can be used as a non-invasive method to monitor elevated intracranial pressure, with increased pulsatility indexes correlating with midline shift, as reported by the American Heart Association 3

After decompressive surgery, patients require intensive care unit monitoring and should use a custom-fitted protective helmet until cranioplasty, as recommended by the American College of Cardiology 1
Cranioplasty can be scheduled when there are no signs of persisting brain swelling, typically 12-16 weeks after discharge, as recommended by the American College of Cardiology 1