Challenging the Ischemic Core Concept in Acute Ischemic Stroke Imaging

Area of Science:

• Neurology
• Radiology
• Interventional Cardiology

Background:

• Endovascular therapy is a leading treatment for acute ischemic stroke caused by large vessel occlusion.
• Baseline imaging, particularly ischemic core volume, is frequently used to guide treatment eligibility.
• Current imaging modalities have limitations in accurately defining infarct core and penumbra.

Purpose of the Study:

• To address fundamental issues and uncertainties in terminology regarding ischemic core assessment for endovascular treatment eligibility.
• To propose a clearer direction for defining and utilizing imaging parameters in acute stroke treatment decisions.

Main Methods:

• Review of current literature and established concepts in acute ischemic stroke imaging and treatment.
• Theoretical analysis of the limitations of computed tomography and magnetic resonance imaging in defining infarct core.
• Discussion of multifactorial treatment decision-making in stroke care.

Main Results:

• Identified three core issues: imprecise infarct core determination by imaging, multifactorial nature of treatment decisions, and discrepancies between core volume and clinical outcomes.
• Highlighted variability in tissue vulnerability, selective neuronal loss, and lack of a definitive gold standard as reasons for imaging uncertainty.

Conclusions:

• Current methods for defining ischemic core volume in acute ischemic stroke are insufficient for precise treatment eligibility determination.
• There is a need for refined terminology and empirical data to improve the accuracy and clinical utility of imaging in guiding endovascular therapy decisions.