Interventions for Left MCA Infarct

Early Identification and Risk Assessment

Clinical predictors of malignant course include high stroke severity scores, nausea/vomiting, and progressive neurological deterioration in patients with left MCA infarcts 2
Radiological predictors include significant hypodensity on initial CT, early midline shift, and involvement of additional vascular territories in patients with left MCA infarcts 3, 2
MRI diffusion-weighted imaging within 6 hours showing large infarct volumes predict a rapid fulminant course in patients with left MCA infarcts 3

The American Heart Association recommends transfer of patients with signs of large MCA infarction to a center with neurosurgical expertise and neuromonitoring capabilities 4
Initial medical management to limit brain swelling includes restricting free water, correcting factors that exacerbate swelling, elevating the head of bed, and avoiding antihypertensive agents that cause cerebral vasodilation 5
Osmotic therapy is reasonable for patients with clinical deterioration from cerebral swelling, with a target serum osmolarity of 315-320 mOsm/L 1, 5
Brief moderate hyperventilation can be used as a bridge to more definitive therapy in patients with malignant MCA infarction 1

Decompressive craniectomy with dural expansion reduces mortality by approximately 50% in patients ≤60 years with unilateral MCA infarction who deteriorate within 48 hours 1
Decompressive craniectomy may be considered in patients >60 years with unilateral MCA infarction who deteriorate within 48 hours, although functional outcomes are worse than in younger patients 1
The surgical technique for decompressive craniectomy includes a large bone flap, extension down to the temporal skull base, and opening the dura widely in a cruciate fashion 6

Decrease in level of consciousness attributed to brain swelling is a reasonable trigger for decompressive craniectomy in patients with malignant MCA infarction 1
The optimal timing for intervention is within 48 hours of stroke onset, before severe neurological deterioration occurs 7, 1
Despite aggressive management, mortality remains high with medical management alone, and hemorrhagic transformation is a common complication of severe stroke 5, 4

After decompressive surgery, patients require intensive care unit monitoring and should use a custom-fitted protective helmet until cranioplasty 6
Cranioplasty can be scheduled when there are no signs of persisting brain swelling, typically 12-16 weeks after discharge 6