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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...

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...

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...

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Related Experiment Video

Updated: May 10, 2026

Modeling Stroke in Mice - Middle Cerebral Artery Occlusion with the Filament Model

Modeling Stroke in Mice - Middle Cerebral Artery Occlusion with the Filament Model

Published on: January 6, 2011

Minor Stroke, Major Uncertainty.

Richard C Childers¹, Sidra Speaker¹, Gary M Vilke¹

¹Department of Emergency Medicine, University of California, San Diego, California.

The Journal of Emergency Medicine

|May 8, 2026

Summary

This summary is machine-generated.

Intravenous thrombolytics (IVT) show no clear benefit in minor stroke patients. Further trials are needed to identify specific subgroups who might benefit before routine use is considered.

Keywords:

intravenous thrombolytics medical reversal minor stroke overtreatment overtriage

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Last Updated: May 10, 2026

Modeling Stroke in Mice - Middle Cerebral Artery Occlusion with the Filament Model

Modeling Stroke in Mice - Middle Cerebral Artery Occlusion with the Filament Model

Published on: January 6, 2011

Transient Middle Cerebral Artery Occlusion Model of Stroke

Transient Middle Cerebral Artery Occlusion Model of Stroke

Published on: August 11, 2023

Modeling Stroke in Mice: Permanent Coagulation of the Distal Middle Cerebral Artery

Modeling Stroke in Mice: Permanent Coagulation of the Distal Middle Cerebral Artery

Published on: July 31, 2014

Area of Science:

Neurology
Emergency Medicine
Pharmacology

Background:

Previous randomized trials did not demonstrate benefits of intravenous thrombolytics (IVT) for minor stroke.
Exclusion criteria in prior studies often omitted patients with disabling deficits.
Debate exists on IVT eligibility for minor stroke if deficits are perceived as disabling.

Purpose of the Study:

To review the literature on IVT in ischemic stroke.
To argue for the necessity of identifying specific patient subgroups benefiting from IVT in randomized trials.
To evaluate the evidence for IVT in minor stroke populations.

Main Methods:

Structured narrative review of existing randomized trials and literature on IVT for stroke.
Analysis of outcomes, particularly changes in modified Rankin Scale (mRS).
Assessment of the consistency and generalizability of IVT trial results.

Main Results:

Literature on IVT for ischemic stroke is inconsistent, with reported beneficial, negative, and harmful outcomes.
Positive trials show shifts in mRS, but this is less clear in minor stroke populations due to typically low baseline scores.
Previous trials excluded patients with disabling deficits, limiting generalizability.

Conclusions:

IVT for acute ischemic stroke has inconsistent evidence compared to other therapies.
Showing benefit in minor stroke patients is theoretically difficult and may not yield significant mRS changes.
Routine IVT for minor stroke is not recommended without clear evidence of benefit in rigorously defined subgroups, due to risks and resource implications.