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Related Experiment Videos

Absence seizures induce a decrease in cerebral blood flow: human and animal data

A Nehlig1, M Vergnes, R Waydelich

  • 1INSERM U 398, Faculté de Médecine, Strasbourg, France.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|January 1, 1996
PubMed
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Cerebral blood flow (CBF) significantly decreases during absence seizures in both children and epilepsy model rats. This reduction in CBF during absence epilepsy suggests a decreased metabolic demand, not altered vascular reactivity.

Area of Science:

  • Neuroscience
  • Epileptology
  • Cerebrovascular Physiology

Background:

  • Previous research indicated decreased cerebral metabolic activity during absence seizures in GAERS rats.
  • This study aimed to confirm reduced functional activity during absence seizures.

Purpose of the Study:

  • To continuously measure cerebral blood flow (CBF) in children with absence epilepsy and in GAERS rats.
  • To investigate the relationship between CBF fluctuations and absence seizures.

Main Methods:

  • Continuous CBF measurements using Doppler ultrasonography in children and laser-Doppler flowmetry in GAERS rats.
  • Recording CBF during spontaneous absences, induced absence status epilepticus, and convulsive seizures.

Main Results:

Related Experiment Videos

  • A significant median decrease of 20-24% in CBF was observed during spontaneous absence seizures in both children and GAERS rats.
  • CBF decreased during haloperidol-induced absence status epilepticus in GAERS but was unaffected by ethosuximide.
  • Convulsive seizures in rats led to a substantial increase in CBF (175-664%).

Conclusions:

  • Spontaneous absence seizures are associated with a decrease in CBF in both humans and the GAERS rat model.
  • The observed CBF decrease during absences is likely a response to reduced metabolic demand, independent of vascular reactivity, blood gases, or blood pressure.