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Related Concept Videos

Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...

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Utilizing Repetitive Transcranial Magnetic Stimulation to Improve Language Function in Stroke Patients with Chronic Non-fluent Aphasia
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Defining Hypoperfusion in Chronic Aphasia: An Individualized Thresholding Approach.

Noelle T Abbott1, Carolyn J Baker1, Conan Chen2

  • 1San Diego State University and University of California San Diego Joint Doctoral Program in Language and Communicative Disorders, San Diego, CA 92182, USA.

Brain Sciences
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

A new method precisely identifies reduced blood flow in structurally intact brain regions in chronic aphasia. This approach improves understanding of language deficits and informs targeted interventions for brain function recovery.

Keywords:
cerebral blood flowchronic aphasiahypoperfusionindividual differenceslanguage behaviorperfusion imagingperilesional tissuestroke

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Area of Science:

  • Neuroscience
  • Neurology
  • Speech and Language Pathology

Background:

  • Aphasia research traditionally links brain lesions to language deficits.
  • This overlooks functional changes in structurally intact brain areas.
  • Reduced cerebral blood flow (hypoperfusion) in these areas contributes to chronic aphasia.

Purpose of the Study:

  • To propose an individualized metric for defining hypoperfusion in chronic aphasia.
  • To quantify hypoperfused tissue in perilesional areas.
  • To investigate the link between hypoperfusion and language impairment.

Main Methods:

  • Exploratory analysis of six individuals with chronic aphasia (>1 year post-onset).
  • Utilized perfusion imaging to assess cerebral blood flow.
  • Developed and applied an individualized hypoperfusion metric.

Main Results:

  • The proposed individualized metric precisely identified functionally impaired tissue.
  • This metric enhanced the understanding of hypoperfusion's impact on language function.
  • Demonstrated the extent of hypoperfused tissue in perilesional bands.

Conclusions:

  • An individualized hypoperfusion metric offers greater precision in chronic aphasia research.
  • Accurate identification of impaired tissue is crucial for understanding language deficits.
  • Findings support interventions targeting both intact and impaired brain tissue for improved outcomes.