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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...

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 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: May 31, 2026

Evaluation of the Cognitive Performance of Hypertensive Patients with Silent Cerebrovascular Lesions

Evaluation of the Cognitive Performance of Hypertensive Patients with Silent Cerebrovascular Lesions

Published on: April 23, 2021

[Silent brain infarcts].

M A Ritter¹, R Dittrich, E B Ringelstein

¹Klinik und Poliklinik für Neurologie, Universitätsklinikum Münster, Albert-Schweitzer-Str. 33, 48129 Münster, Deutschland. ritterm@uni-muenster.de

|July 16, 2011

Summary

This summary is machine-generated.

Silent brain infarctions, often found via modern imaging, are common in individuals without a stroke history. These "silent" lesions are linked to stroke risk factors and may indicate procedural risks.

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Assessing Cortical Cerebral Microinfarcts on High Resolution MR Images

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Brain Infarct Segmentation and Registration on MRI or CT for Lesion-symptom Mapping

Brain Infarct Segmentation and Registration on MRI or CT for Lesion-symptom Mapping

Published on: September 25, 2019

Area of Science:

Neurology
Neuroradiology
Epidemiology

Context:

Silent brain infarctions (SBIs) are frequently detected using advanced cerebral imaging techniques.
Epidemiological studies reveal SBIs in up to 30% of individuals lacking a clinical stroke history.
SBIs are ischemic brain lesions without a corresponding clinical syndrome, often missed by traditional assessments.

Purpose:

To highlight the prevalence and significance of silent brain infarctions.
To discuss the limitations of current stroke definitions in detecting cognitive deficits from infarctions.
To underscore the association of SBIs with known stroke risk factors and comorbidities.

Summary:

Silent brain infarctions are common, occurring 5-10 times more frequently than clinically overt strokes.
While predominantly subcortical, approximately 10% of SBIs are cortical.
SBIs detected by DWI lesions on MRI are common during procedures, suggesting their monitoring can reduce periprocedural stroke risk.

Impact:

Recognizing SBIs is crucial as they are linked to significant stroke risk factors.
The prevalence of SBIs suggests current stroke diagnostic criteria may be insensitive to subtle neurological deficits.
Monitoring SBIs during interventions may improve procedural safety and reduce stroke incidence.