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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...

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...

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.

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...

Regulation of Stroke Volume

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...

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Updated: May 9, 2026

A Middle Cerebral Artery Occlusion Technique for Inducing Post-stroke Depression in Rats

A Middle Cerebral Artery Occlusion Technique for Inducing Post-stroke Depression in Rats

Published on: May 22, 2019

[Update on stroke epidemiology].

Ken Nagata¹, Kazuo Suzuki

¹Department of Neurology, Research Institute for Brain and Blood Vessels, Akita, Japan.

Brain and Nerve = Shinkei Kenkyu No Shinpo

|July 9, 2013

Summary

This summary is machine-generated.

Stroke mortality has declined in Japan, but incidence is rising due to aging. Cerebrovascular lesions are linked to dementia in stroke survivors.

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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

Area of Science:

Epidemiology of cerebrovascular diseases
Geriatric medicine
Neurology

Context:

Stroke was a leading cause of death in Japan from the 1950s-1970s.
Stroke mortality declined significantly by 2011, becoming the fourth leading cause of death.
The Akita Stroke Onset Registry (ASOR) tracks stroke events in Akita prefecture.

Purpose:

To analyze epidemiological changes in stroke in Japan over 50 years.
To investigate stroke incidence, recurrence, and the association with dementia.
To understand the impact of population aging on stroke trends.

Summary:

Stroke mortality has decreased, with cerebral hemorrhage reduction being a key factor.
Despite declining mortality, stroke incidence, particularly cerebral infarction, has increased, attributed to population aging.
Recurrence rates vary by stroke type, with cerebral infarction having the highest recurrence.
Dementia prevalence is significantly higher in stroke survivors compared to those without stroke history.

Impact:

Highlights the changing landscape of stroke epidemiology in Japan.
Underscores the link between cerebrovascular lesions and dementia, especially in the elderly.
Provides crucial data for public health strategies and clinical management of stroke and dementia.