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Related Concept Videos

Ischemic Stroke l: Introduction01:15

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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.

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The NIH stroke scale can establish cognitive function after stroke.

Toby B Cumming1, Christian Blomstrand, Julie Bernhardt

  • 1National Stroke Research Institute, Melbourne, Vic., Australia.

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|April 29, 2010
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Summary
This summary is machine-generated.

A brief cognitive assessment using four National Institutes of Health Stroke Scale (NIHSS) items, termed Cog-4, shows promise in identifying severe cognitive impairment post-stroke, nearly matching the Mini-Mental State Examination (MMSE).

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Area of Science:

  • Neurology
  • Neuropsychology
  • Geriatric Medicine

Background:

  • Cognitive impairment is a significant, often overlooked, outcome of stroke.
  • The National Institutes of Health Stroke Scale (NIHSS) is a standard tool for stroke assessment.
  • There is a need for validated tools to assess cognitive status after stroke.

Purpose of the Study:

  • To evaluate if a subset of NIHSS items can reliably assess cognitive function in stroke patients.
  • To compare the diagnostic accuracy of this NIHSS subset (Cog-4) with the Mini-Mental State Examination (MMSE).

Main Methods:

  • 149 stroke patients from the Göteborg 70+ Stroke Study were assessed at 18 months post-stroke.
  • A four-item NIHSS subset (Cog-4) measuring orientation, executive function, language, and inattention was derived.
  • Cog-4 and MMSE scores were compared against a reference diagnosis of severe cognitive impairment.

Main Results:

  • The Cog-4 scale achieved an area under the receiver-operator curve (AUC) of 0.78 for detecting severe cognitive impairment.
  • The MMSE demonstrated slightly higher diagnostic precision with an AUC of 0.84.
  • Enhancing the executive function task in the Cog-4 improved its precision, yielding an AUC of 0.81.

Conclusions:

  • A four-item NIHSS composite score (Cog-4) is a nearly equivalent alternative to the MMSE for detecting severe cognitive impairment after stroke.
  • While dedicated cognitive assessments are ideal, the Cog-4 offers a practical indicator of cognitive function in the absence of such measures.
  • The Cog-4 provides a valuable screening tool for cognitive deficits in stroke survivors.