Related Experiment Video

Updated: Aug 17, 2026

Utilizing the Modified T-Maze to Assess Functional Memory Outcomes After Cardiac Arrest
07:02

Utilizing the Modified T-Maze to Assess Functional Memory Outcomes After Cardiac Arrest

Published on: January 5, 2018

Post-seizures amygdaloallocortical microvascular lesion leading to atrophy and memory impairment

Sima Mraovitch1, Yolande Calando, Angélique Régnier

  • 1Laboratoire de Recherche Cérébrovasculaires CNRS URA 641, Université Paris VII, 10, av de Verdun, 75010 Paris, France. mraovit@ext.jussieu.fr

Neurobiology of Disease
|July 19, 2005
PubMed

Insights

Generalized convulsive seizures can trigger multifocal brain hemorrhages and tissue damage, creating focal injury-prone areas (FIPA). This suggests seizures, not just cerebrovascular events, may initiate brain injury, necessitating comprehensive treatment strategies.

Area of Science:

  • Neuroscience
  • Pathology
  • Cerebrovascular Medicine

Background:

  • Seizures are recognized complications of cerebrovascular events like intracerebral hemorrhage.
  • The precise mechanisms underlying seizure-induced brain injury, particularly hemorrhage, require further elucidation.

Purpose of the Study:

  • To investigate the origin of multifocal amygdaloallocortical hemorrhage and tissue necrosis following generalized convulsive seizures.
  • To identify the cellular and molecular events preceding seizure-induced brain injury.

Main Methods:

  • Induction of generalized convulsive seizures via cholinergic stimulation of specific brain nuclei.
  • Assessment of neuronal and microvascular changes, including COX-2 expression, pro-inflammatory cytokine presence (IL-1beta, TNF-alpha), edema, and microhemorrhages.
  • Histopathological analysis to evaluate tissue necrosis, atrophy, and cognitive impairment.

Main Results:

  • Generalized convulsive seizures induced multifocal amygdaloallocortical hemorrhage and necrosis, defining a focal injury-prone area (FIPA).
  • Injury was preceded by reduced neuronal COX-2 and increased microvascular IL-1beta and TNF-alpha, indicating inflammation.
  • Microvascular inflammation led to edema, microhemorrhages, subsequent atrophy, and cognitive deficits.

Conclusions:

  • Generalized convulsive seizures can initiate amygdaloallocortical microvascular injury.
  • This finding suggests seizures may be a primary cause of brain damage in some cerebrovascular accidents.
  • Comprehensive clinical evaluation and therapy for seizure-associated cerebrovascular accidents, beyond anticonvulsants, are recommended.

More Related Videos

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice13:34

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice

Published on: June 4, 2020

Stereotaxic Infusion of Oligomeric Amyloid-beta into the Mouse Hippocampus08:16

Stereotaxic Infusion of Oligomeric Amyloid-beta into the Mouse Hippocampus

Published on: June 17, 2015

Related Concept Videos

Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...
Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
Amnesia01:13

Amnesia

Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
Dementia l: Introduction01:22

Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...