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Ischemic Stroke l: Introduction

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.

Stroke: Introduction and Types

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 ll: Pathophysiology

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: Pathophysiology

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...

Hemorrhagic Stroke l: Introduction

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...

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Related Experiment Video

Updated: Jun 8, 2026

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

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

Published on: December 19, 2025

The Causative Classification of Stroke system: an international reliability and optimization study.

E M Arsava¹, E Ballabio, T Benner

¹A.A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA.

|October 6, 2010

Summary

The Causative Classification of Stroke System (CCS) demonstrates high interrater reliability for determining ischemic stroke subtypes. This supports its use in international multicenter studies for accurate stroke classification and communication.

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Last Updated: Jun 8, 2026

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

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Published on: February 7, 2025

Area of Science:

Neurology
Medical Informatics

Background:

Accurate ischemic stroke subtype determination is essential for robust multicenter research.
The Causative Classification of Stroke System (CCS) is an evidence-based algorithm for classifying stroke subtypes.

Purpose of the Study:

To evaluate the interrater reliability of the CCS algorithm.
To determine the suitability of CCS for international multicenter stroke studies.

Main Methods:

Twenty International Stroke Genetics Consortium members from 13 centers independently classified 50 acute ischemic stroke cases using CCS.
Interrater agreement was assessed using the kappa statistic.

Main Results:

High kappa values were observed for causative classification (0.70-0.81) and phenotypic classification (0.79-0.95) across different subtype models.
Correction of a software issue improved agreement, particularly for the 16-subtype model.

Conclusions:

The CCS algorithm exhibits high interrater reliability for stroke subtype classification.
CCS is a valuable tool for improving stroke classification consistency in multicenter studies and facilitating clear communication among researchers.