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Related Concept Videos

Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
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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Updated: Jul 11, 2026

Dual-Task Stroop Paradigm for Detecting Cognitive Deficits in High-Functioning Stroke Patients
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Cognitive dysfunction in isolated brainstem stroke: a neuropsychological and SPECT study.

M Hoffmann1, A Watts

  • 1Department of Neurology, University of Natal, Natal, Durban, South Africa.

Journal of Stroke and Cerebrovascular Diseases : the Official Journal of National Stroke Association
|September 27, 2007
PubMed
Summary

Isolated brainstem strokes can cause significant cognitive impairment, particularly frontal system syndromes. Single-photon-emission computed tomographic (SPECT) scanning may detect brain changes missed by MRI, aiding diagnosis.

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Area of Science:

  • Neurology
  • Neuroscience
  • Radiology

Background:

  • Brainstem strokes are often associated with severe neurological deficits.
  • Cognitive impairments following brainstem stroke are not fully understood.
  • Distinguishing primary brainstem stroke effects from other cerebral lesions is crucial.

Purpose of the Study:

  • To investigate cognitive impairments and cerebral blood flow in patients with isolated brainstem stroke.
  • To compare the sensitivity of SPECT scanning versus MRI in detecting brainstem stroke-related changes.
  • To evaluate the long-term functional recovery and employment status of affected individuals.

Main Methods:

  • Prospective study of five patients with first-ever, isolated brainstem stroke.
  • Neuropsychological testing and single-photon-emission computed tomographic (SPECT) scanning.
  • Magnetic resonance imaging (MRI) for structural brain assessment.
  • Comparison of SPECT findings with age-matched controls.

Main Results:

  • MRI revealed pontine and midbrain infarcts without other cerebral lesions.
  • SPECT detected frontal and parietal hypoperfusion (P < .05).
  • Neuropsychological testing identified frontal system syndromes in all patients and parietal signs in two.
  • Four patients achieved excellent medical recovery, one had moderate recovery.

Conclusions:

  • Isolated brainstem stroke can lead to significant cognitive impairment, especially frontal system syndromes.
  • SPECT scanning may be more sensitive than structural neuroimaging (MRI) in detecting functional deficits after brainstem stroke.
  • Cognitive deficits, particularly frontal system syndromes, can hinder return to employment.