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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.

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 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...

Transient Ischemic Attack l: Introduction

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...

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Transient Middle Cerebral Artery Occlusion Model of Neonatal Stroke in P10 Rats

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Penumbra in Acute Ischemic Stroke.

Yang Yi¹, Zijia Liu¹, Meng Wang¹

¹Faculty of Environment and Life College of Life Science and Chemistry, Beijing University of Technology, China.

Current Neurovascular Research

|December 31, 2021

Summary

This summary is machine-generated.

Understanding the ischemic penumbra, brain tissue at risk during acute ischemic stroke, is crucial for effective treatment. This review covers its evolving concepts, diagnosis, and therapeutic strategies.

Keywords:

Acute ischemic stroke CT Perfusion biomarker cerebral blood flow.ischemic penumbra positron emission tomography

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Published on: November 22, 2024

Area of Science:

Neurology
Cerebrovascular Medicine
Neuroscience

Background:

Acute ischemic stroke is a major global health concern, causing significant disability and mortality.
The ischemic penumbra, brain tissue surrounding the infarct core, is a key target for therapeutic intervention.
Evolving concepts of the penumbra are based on energy metabolism, cerebral blood flow (CBF) thresholds, and protein synthesis.

Purpose of the Study:

To summarize recent advancements in understanding the ischemic penumbra.
To review diagnostic methods, including imaging techniques and biomarkers.
To discuss current and future therapeutic strategies for acute ischemic stroke.

Main Methods:

Literature review of recent advances in ischemic penumbra research.
Analysis of diagnostic imaging techniques and biomarkers.
Evaluation of current and emerging treatment modalities.

Main Results:

The concept of the ischemic penumbra has evolved significantly since its initial definition.
Advanced imaging and biomarker techniques aid in penumbra diagnosis.
Various treatments targeting the penumbra have been developed, with ongoing research into novel approaches.

Conclusions:

A comprehensive understanding of the ischemic penumbra is vital for improving acute ischemic stroke outcomes.
Continued research into advanced diagnostics and targeted therapies is essential.
Future therapeutic targets may extend beyond the traditional penumbra definition.