Imaging Findings Associated with Space-Occupying Edema in Patients with Large Middle Cerebral Artery Infarcts

Area of Science:

• Neurology
• Radiology
• Stroke Medicine

Background:

• Space-occupying cerebral edema is a severe complication of large middle cerebral artery (MCA) infarcts.
• The reasons for varying edema extent remain unclear, necessitating research into predictive factors.
• Understanding edema development is crucial for refining treatment strategies in acute stroke care.

Purpose of the Study:

• To identify variables associated with the development of prominent space-occupying cerebral edema.
• To investigate the relationship between infarct characteristics and edema formation in MCA stroke patients.

Main Methods:

• Analysis of 137 patients with large MCA infarcts (ASPECTS ≤4) from the Dutch Acute Stroke Study (DUST).
• Prominent edema defined as midline shift ≥5 mm on follow-up CT.
• Evaluation of admission CT/CTA parameters (ASPECTS, CBV, MTT, occlusion site, clot burden, collaterals) and CTP permeability, plus recanalization/reperfusion status.

Main Results:

• Prominent edema occurred in 37% of patients.
• Factors associated with increased odds of prominent edema included lower ASPECTS, lower CBV, higher permeability, proximal thrombus location, higher clot burden, and poor collaterals.
• Adjusted odds ratios indicated significant associations for all identified factors.

Conclusions:

• Extensive proximal occlusion, poor collaterals, and larger ischemic deficits with higher permeability are key contributors to prominent edema in large MCA infarcts.
• These findings highlight critical imaging markers for predicting severe edema post-MCA stroke.
• Targeting these factors may lead to improved patient outcomes and therapeutic interventions.