Management of Middle Cerebral Artery Territory Infarction

Clinical Effects and Risk Factors

Brain swelling is responsible for approximately one-third of deterioration cases in patients with MCA territory infarctions, with a risk estimated at 10-20% in anterior circulation ischemic stroke 1
Clinical predictors of malignant course include high stroke severity scores, nausea/vomiting, bilateral ptosis, and involvement of the nondominant hemisphere, with history of hypertension, heart failure, elevated white blood cell count, and 50% MCA hypodensity on CT increasing risk of fatal brain edema 1, 4
Early CT scan hypodensity (>50% of MCA territory within 12 hours) and hyperdense MCA signs predict neurological deterioration, with mass effect on CT indicating risk of clinical worsening 1

The American Heart Association recommends diffusion-weighted MRI as the most sensitive and specific imaging technique for early infarct detection, with CT angiography used to confirm MCA occlusion and assess collateral circulation 5, 4
Initial management of brain swelling should include restriction of free water to avoid hypo-osmolar fluid that may worsen edema, with elevation of the head of bed to 20-30 degrees to help venous drainage 1, 4
Osmotic therapy with mannitol or hypertonic saline is reasonable for patients with clinical deterioration from cerebral swelling, with decompressive hemicraniectomy considered in patients with malignant MCA infarction, particularly within 48 hours of stroke onset and before severe neurological deterioration occurs 4, 6, 7

Decompressive hemicraniectomy significantly reduces mortality by approximately 50% in patients ≤60 years, with surgery may be lifesaving but often results in survival with moderate to severe disability for patients aged 60-80 years 7, 4
Decompressive suboccipital craniotomy is recommended for cerebellar swelling to remove necrotic tissue, with approximately 20% of cerebellar infarction patients developing radiographic signs of mass effect with neurological deterioration 1, 8
Regular monitoring for signs of increased intracranial pressure and midline shift is essential, with risk of hemorrhagic transformation increasing with large infarct size, use of thrombolytic agents, and reperfusion of severely damaged tissue 4