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Ischaemic penumbra: highlights.

Isabella F Pestalozza¹, Silvia Di Legge, Marco Calabresi

¹University of Rome La Sapienza, Italy.

Clinical and Experimental Hypertension (New York, N.Y. : 1993)

|November 27, 2002

Summary

The ischaemic penumbra, a brain tissue at risk during stroke, can be salvaged with timely treatment. Advanced neuroimaging techniques are crucial for identifying and managing this dynamic area to improve patient recovery.

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Area of Science:

Neurology
Radiology
Medical Imaging

Background:

The ischaemic penumbra is defined as hypoperfused brain tissue surrounding an infarct core.
This tissue is functionally silent but potentially salvageable with prompt reperfusion.
The concept of the penumbra is dynamic and time-dependent, emphasizing the urgency of intervention.

Purpose of the Study:

To review the role of neuroimaging techniques in studying the ischaemic penumbra.
To highlight the importance of these techniques in the management of acute ischemic stroke.
To discuss how neuroimaging aids in selecting patients for therapeutic trials.

Main Methods:

Discussion of functional neuroimaging techniques: Single Photon Emission Tomography (SPET), Positron Emission Tomography (PET).
Focus on Magnetic Resonance Imaging (MRI) techniques: Diffusion-Weighted Imaging (DWI) and Perfusion-Weighted Imaging (PWI).
Emphasis on 'in vivo' quantitative estimation of cerebral blood flow (CBF) and metabolic changes.

Main Results:

Neuroimaging provides quantitative estimates of CBF and tissue viability.
These techniques are essential for evaluating the extent and dynamics of the ischaemic penumbra.
Functional imaging guides therapeutic strategies by assessing treatment effectiveness and time windows.

Conclusions:

Neuroimaging plays a critical role in the evolving management of acute ischemic stroke.
Salvaging the ischaemic penumbra is key to enhancing patient recovery.
Identifying the optimal candidates for clinical trials is facilitated by advanced neuroimaging.

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