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Related Concept Videos

Seizures: Classification01:13

Seizures: Classification

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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
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Transient Ischemic Attack l: Introduction01:26

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A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
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Related Experiment Video

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Generation and On-Demand Initiation of Acute Ictal Activity in Rodent and Human Tissue
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Is ictal cognitive dysfunction predictable?

Ivan Osorio1

  • 1Department of Neurology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160, United States.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|April 1, 2014
PubMed
Summary
This summary is machine-generated.

Predicting cognitive dysfunction during seizures is challenging. Cognitive deficits during focal seizures appear abruptly, making them unpredictable and unlikely to improve epilepsy patient quality of life.

Keywords:
ClinicalCognitiveIctalInter-ictalPre-ictalPredictionQuality of lifeSeizuresSub-clinicalWarning

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Area of Science:

  • Neuroscience
  • Clinical Neurology

Background:

  • Accurate prediction of electrographic seizure onset is crucial for improving quality of life in epilepsy patients.
  • Sub-clinical seizures far outnumber clinical seizures, posing a challenge for prediction without causing patient distress.

Purpose of the Study:

  • To investigate the predictability of ictal cognitive dysfunction in epilepsy patients.
  • To determine if cognitive changes precede seizure onset, aiding in early detection.

Main Methods:

  • Compared cognitive performance (reaction time test) during and between seizures in 14 epilepsy surgery evaluation patients.
  • Utilized automated seizure detection to trigger cognitive tests, assessing pre-ictal cognitive state.

Main Results:

  • No significant differences in cognitive performance were found between ictal and inter-ictal states until late in focal seizure evolution.
  • Cognitive dysfunction during focal seizures was not reliably detected in the early stages.

Conclusions:

  • Cognitive dysfunction in focal seizures originating from discrete cortical regions appears abrupt and unpredictable.
  • Accurate prediction of seizure onset remains elusive, and early warnings for sub-clinical events may increase patient psychological burden.