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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.

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...

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...

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Related Experiment Video

Updated: May 16, 2026

Transient Middle Cerebral Artery Occlusion Model of Stroke

Transient Middle Cerebral Artery Occlusion Model of Stroke

Published on: August 11, 2023

Transient isolated brainstem symptoms preceding posterior circulation stroke: a population-based study.

Nicola L M Paul¹, Michela Simoni, Peter M Rothwell

¹Stroke Prevention Research Unit, Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK.

The Lancet. Neurology

|December 5, 2012

Summary

Transient neurological attacks (TNAs) involving brainstem symptoms are common before vertebrobasilar stroke but often don't meet TIA criteria. Early recognition is crucial for stroke prevention.

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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:

Neurology
Vascular Neurology
Epidemiology

Background:

Transient isolated brainstem symptoms (e.g., vertigo, diplopia) are not consistently classified as transient ischemic attacks (TIAs).
Prognostic data for these transient neurological attacks (TNAs) are limited.
Understanding TNAs preceding vertebrobasilar stroke is crucial for identifying potential ischemic events.

Purpose of the Study:

To assess the frequency of TNAs before vertebrobasilar ischemic stroke.
To compare TNA rates preceding vertebrobasilar versus carotid stroke.
To evaluate if TNAs are indicative of impending posterior circulation strokes.

Main Methods:

A prospective, population-based incidence study (Oxford Vascular Study, 2002-2010) was conducted.
Ischaemic events within 90 days preceding stroke were analyzed.
Specific symptoms were classified as TNAs in vertebrobasilar, carotid, or uncertain territories.

Main Results:

Isolated brainstem TNAs were significantly more frequent before vertebrobasilar stroke (45/275) than carotid stroke (10/759).
TNAs were particularly frequent in the 2 days preceding vertebrobasilar stroke (OR 35.8).
Only 8% of preceding TNAs met National Institute of Neurological Disorders and Stroke (NINDS) criteria for TIA; medical attention was rarely sought.

Conclusions:

Preceding transient isolated brainstem symptoms are common in patients with vertebrobasilar stroke.
Most of these symptoms do not meet traditional TIA definitions.
Further research on the prognosis of transient isolated brainstem symptoms is warranted.