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Related Concept Videos

Stroke: Introduction and Types01:29

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: Introduction01:15

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: Pathophysiology01:15

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: Pathophysiology01:29

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: Introduction01:26

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: Introduction01:17

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: Jun 13, 2026

Optimized Management of Endovascular Treatment for Acute Ischemic Stroke
09:21

Optimized Management of Endovascular Treatment for Acute Ischemic Stroke

Published on: January 18, 2018

FAST positive does not always mean stroke.

Barry Moynihan1, Rumana Chowdhury, Anthony Pereira

  • 1Department of Neurology, St. George's Hospital, London

Clinical Medicine (London, England)
|May 5, 2010
PubMed
Summary
This summary is machine-generated.

Stroke mimic diagnoses are possible for patients with positive face, arm, speech test (FAST) results. Rapid symptom onset assessment and magnetic resonance imaging aid in accurate clinical evaluation.

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Published on: December 28, 2014

Area of Science:

  • Neurology
  • Emergency Medicine
  • Diagnostic Imaging

Background:

  • Stroke mimics present a diagnostic challenge in emergency settings.
  • The face, arm, speech test (FAST) is a common screening tool for stroke.
  • Differentiating stroke from mimics requires careful clinical assessment.

Observation:

  • Patients testing positive on the FAST may not have experienced an acute ischemic stroke.
  • The speed of symptom onset is a critical factor in diagnosis.
  • Magnetic resonance imaging (MRI) offers valuable insights beyond initial clinical evaluation.

Findings:

  • Prompt evaluation of symptom onset speed is crucial for stroke mimic diagnosis.
  • MRI can supplement clinical findings, improving diagnostic accuracy.
  • Integrating clinical assessment with advanced imaging aids in distinguishing stroke from non-stroke events.

Implications:

  • Accurate diagnosis of stroke mimics can prevent unnecessary thrombolytic therapy.
  • Improved diagnostic pathways can lead to more appropriate patient management.
  • Understanding the role of symptom onset and MRI enhances clinical decision-making for suspected stroke patients.