Management of ACA-MCA Watershed Infarct

Initial Assessment and Diagnosis

The American College of Cardiology recommends performing immediate neuroimaging with non-contrast CT to rule out hemorrhage and estimate the ischemic core using ASPECTS score 2
CT angiography should be used to confirm arterial occlusion and assess collateral circulation 2
Diffusion-weighted MRI is the gold standard for ischemic core assessment and should be used when available 2
Clinical predictors of malignant course include high stroke severity scores, nausea/vomiting, and progressive neurological deterioration 2

The American Heart Association recommends administering intravenous thrombolysis with alteplase if no contraindications exist for patients presenting within the treatment window (within 4.5 hours) 3, 2
Mechanical thrombectomy is strongly recommended for patients with proximal arterial occlusion, particularly those with small-to-moderate ischemic cores (ASPECTS ≥6) 3, 2
Treatment should be initiated (groin puncture) within 6 hours of symptom onset for best outcomes 3
Patients eligible for intravenous r-tPA should receive it even if endovascular treatments are being considered 3

The American College of Cardiology recommends monitoring blood pressure frequently (at least every 6 hours) 1
Target blood pressure values of ≤180/105 mmHg during and for 24 hours after mechanical thrombectomy 1, 2
Avoid aggressive blood pressure reduction, particularly agents that cause cerebral vasodilation 1

The American College of Cardiology recommends administering aspirin (325 mg daily) within 24-48 hours after stroke onset 1, 2
If true aspirin allergy is present, clopidogrel (75 mg orally per day) should be substituted 4
Avoid ibuprofen as it blocks the antiplatelet effects of aspirin 4

Position the patient with head of bed elevated at 20-30 degrees to help venous drainage 1
Restrict free water to avoid hypo-osmolar fluid that may worsen edema 1, 2
Correct factors that could exacerbate swelling, including hypoxemia, hypercarbia, and hyperthermia 1
For patients with significant edema and increased intracranial pressure, consider mannitol at 0.25-0.5 g/kg IV administered over 20 minutes every 6 hours (maximum dose 2 g/kg) 1, 2

Decompressive hemicraniectomy has been shown to significantly reduce mortality in patients with malignant MCA infarction 1
Optimal timing for decompressive craniectomy is within 48 hours of stroke onset, before severe neurological deterioration occurs 1, 2
Best candidates include patients under 60 years of age (strongest evidence) 1
For patients over 60 years, the likelihood of resulting severe disability should be discussed with the patient/family 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 2

Decompressive hemicraniectomy significantly reduces mortality but survivors may have moderate to severe disability 1
Discussions with patients and families should include information about likely outcomes and potential for survival with significant disabilities 1

Medical management alone (including osmotic diuretics) has not been proven efficacious for malignant MCA infarction 1
The benefit of surgery in older patients (>60 years) is less certain and should be carefully considered on a case-by-case basis 1