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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 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.

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...

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...

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...

Disorders of Hemostasis

Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

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Updated: Jun 19, 2026

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia

A Thrombotic Stroke Model Based On Transient Cerebral Hypoxia-ischemia

Published on: August 18, 2015

Stroke and cerebrovascular disorders.

Nomazulu Dlamini¹, Fenella J Kirkham

¹Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada.

Current Opinion in Pediatrics

|November 3, 2009

Summary

Pediatric stroke research advances classification and identifies risk factors like arterial disease and infection. Further clinical trials are needed to improve evidence-based guidelines and treatment for childhood cerebrovascular disorders.

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Area of Science:

Pediatric neurology
Cerebrovascular diseases
Childhood neurology

Background:

Childhood stroke and cerebrovascular disorders cause significant morbidity.
Understanding stroke mechanisms is crucial for improving pediatric stroke investigation and management.

Purpose of the Study:

To review recent advances in the understanding, classification, and management of pediatric stroke.
To highlight emerging risk factors, diagnostic tools, and treatment guidelines in childhood cerebrovascular disorders.

Main Methods:

Review of recent clinical and radiological studies on pediatric stroke.
Analysis of data on stroke recurrence, risk factors, and associated conditions.
Evaluation of new imaging techniques and treatment guidelines.

Main Results:

Advances in pediatric stroke classification based on injury patterns and timing.
Identification of multifactorial risk factors with geographical variations; causality remains challenging.
Strong association between stroke recurrence, outcome, and arterial diseases (e.g., Moyamoya, arteriopathy); infection link recognized.
Screening for arteriopathy now recommended for neurofibromatosis type 1, in addition to sickle cell disease.
Perfusion and MRI wall imaging aid stroke cause determination; treatment guidelines published, but thrombolysis barriers persist.

Conclusions:

Progress in understanding and managing childhood stroke is encouraging.
Lack of clinical trials and evidence-based guidelines remains a significant limitation.
The International Pediatric Stroke Study aims to conduct clinical trials to advance evidence-based practice.