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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...
Regulation of Stroke Volume01:27

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
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...
Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac output averages...
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.
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...

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Related Experiment Video

Updated: Jun 13, 2026

Modeling Stroke in Mice: Transient Middle Cerebral Artery Occlusion via the External Carotid Artery
07:26

Modeling Stroke in Mice: Transient Middle Cerebral Artery Occlusion via the External Carotid Artery

Published on: May 24, 2021

[Stroke].

C Lichy1, W Hacke

  • 1Neurologische Klinik, Klinikum Memmingen, Bismarckstrasse 23, 87700, Memmingen, Germany. christoph.lichy@klinikum-memmingen.de

Der Internist
|May 19, 2010
PubMed
Summary
This summary is machine-generated.

Acute stroke and transient ischemic attacks are medical emergencies requiring immediate attention. Prompt diagnosis and reperfusion therapy, especially within extended time windows, significantly improve patient outcomes.

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The Stroke Preclinical Assessment Network Multi-Laboratory Model of Thromboembolic Stroke with Thrombolysis: TE-MCAo
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The Stroke Preclinical Assessment Network Multi-Laboratory Model of Thromboembolic Stroke with Thrombolysis: TE-MCAo

Published on: December 19, 2025

Related Experiment Videos

Last Updated: Jun 13, 2026

Modeling Stroke in Mice: Transient Middle Cerebral Artery Occlusion via the External Carotid Artery
07:26

Modeling Stroke in Mice: Transient Middle Cerebral Artery Occlusion via the External Carotid Artery

Published on: May 24, 2021

The Stroke Preclinical Assessment Network Multi-Laboratory Model of Thromboembolic Stroke with Thrombolysis: TE-MCAo
06:38

The Stroke Preclinical Assessment Network Multi-Laboratory Model of Thromboembolic Stroke with Thrombolysis: TE-MCAo

Published on: December 19, 2025

Area of Science:

  • Neurology
  • Emergency Medicine
  • Vascular Medicine

Context:

  • Acute stroke and transient ischemic attacks (TIAs) demand highest priority due to high risk of subsequent events.
  • Early brain imaging is crucial for differentiating ischemic from hemorrhagic stroke.
  • Patients with TIAs face a significant risk of stroke within 48 hours.

Purpose:

  • To emphasize the critical importance of rapid diagnosis and treatment initiation in acute stroke.
  • To highlight reperfusion as the primary therapeutic goal in acute ischemic stroke.
  • To underscore the time-dependent nature of reperfusion therapy effectiveness.

Summary:

  • Acute ischemic stroke management focuses on rapid reperfusion via intravenous thrombolysis or intra-arterial approaches.
  • Successful reperfusion outcomes are directly correlated with treatment initiation time; earlier intervention yields better results.
  • Extended thrombolysis time windows (up to 4.5 hours) necessitate prompt diagnosis and treatment without delay.

Impact:

  • Specialized stroke units facilitate early etiological workup and secondary prevention, improving outcomes.
  • Comprehensive stroke care, including complication management and early rehabilitation, is vital for all stroke victims.
  • Timely and effective reperfusion strategies significantly enhance the chances of substantial clinical improvement in acute stroke patients.