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Related Concept Videos

Stroke: Introduction and Types01:29

Stroke: Introduction and Types

A stroke is an acute neurological event caused by the sudden disruption of cerebral blood flow, leading to rapid loss of neuronal function. Neurons depend on continuous oxygen and glucose supply, so even brief interruptions can cause irreversible injury within minutes. Strokes are classified into ischemic and hemorrhagic types.Ischemic StrokeIschemic strokes are most common and occur due to arterial occlusion, depriving brain tissue of oxygen and nutrients. This leads to energy failure, ionic...
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.
Hemorrhagic Stroke l: Introduction01:17

Hemorrhagic Stroke l: Introduction

A hemorrhagic stroke is an acute neurological event that occurs when a weakened cerebral blood vessel ruptures, allowing blood to accumulate within or around the brain. The sudden release of blood forms a focal hematoma that increases intracranial pressure, displaces neural tissue, and can obstruct cerebrospinal fluid pathways. These effects may be compounded by intraventricular extension of the hemorrhage, cerebral edema, or compression of adjacent structures, all of which contribute to...
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...
Hemorrhagic Stroke ll: Pathophysiology01:29

Hemorrhagic Stroke ll: Pathophysiology

A hemorrhagic stroke develops when a cerebral blood vessel ruptures, allowing blood to escape into the surrounding brain tissue, as in intracerebral hemorrhage (ICH), or into the subarachnoid space, as in subarachnoid hemorrhage (SAH). Because the skull is a rigid compartment, the sudden presence of extravascular blood rapidly increases intracranial pressure and compresses adjacent neural structures, leading to immediate tissue injury and impaired cerebral perfusion.Mass Effect and Primary...
Epilepsy ll: Types01:22

Epilepsy ll: Types

Recurrent seizures, stemming from abnormal electrical activity in the brain, are the defining characteristic of epilepsy, a chronic neurological condition. Because seizure features vary greatly, epilepsy is classified using two systems: by seizure type and by epilepsy syndromes. These classifications enable clinicians to describe seizure patterns and select suitable treatment strategies.I. Classification by Seizure Type1. Focal EpilepsyFocal epilepsy begins in one hemisphere of the brain.

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The Stroke Preclinical Assessment Network Multi-Laboratory Model of Thromboembolic Stroke with Thrombolysis: TE-MCAo
06:38

The Stroke Preclinical Assessment Network Multi-Laboratory Model of Thromboembolic Stroke with Thrombolysis: TE-MCAo

Published on: December 19, 2025

Classification of stroke subtypes.

P Amarenco1, J Bogousslavsky, L R Caplan

  • 1Department of Neurology and Stroke Center, INSERM U-698 and Paris-Diderot University, Bichat University Hospital, Paris, France. pierre.amarenco@bch.aphp.fr

Cerebrovascular Diseases (Basel, Switzerland)
|April 4, 2009
PubMed
Summary
This summary is machine-generated.

This review proposes a new stroke subtype classification system for improved patient categorization in clinical trials, epidemiological studies, and treatment decisions. The system distinguishes stroke types and etiologies, incorporating surrogate markers for comprehensive phenotyping.

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Area of Science:

  • Neurology
  • Medical Informatics

Background:

  • Stroke classification is crucial for research and clinical practice.
  • Existing systems vary in purpose and scope, leading to inconsistencies.
  • A standardized approach is needed for accurate patient phenotyping and therapeutic decision-making.

Purpose of the Study:

  • To review existing stroke subtype classification systems.
  • To propose rules and a framework for a novel, comprehensive stroke classification system.
  • To enhance stroke patient characterization for diverse research and clinical applications.

Main Methods:

  • Systematic review of published stroke subtype classification systems.
  • Analysis of classification purposes: clinical trials, epidemiology, genetics, and treatment.
  • Development of a classification framework distinguishing stroke types (ischemic, hemorrhagic, etc.) and etiologies.

Main Results:

  • Identified limitations in current stroke classification systems.
  • Proposed a classification structure differentiating major stroke categories and ischemic stroke etiologies.
  • Incorporated surrogate markers (e.g., carotid plaque, leukoaraiosis) for detailed phenotyping.

Conclusions:

  • A refined stroke classification system is essential for advancing stroke research and patient care.
  • The proposed system offers a basis for consistent and detailed stroke patient subtyping.
  • Integration of etiologies and surrogate markers enhances the utility of stroke classification.