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Related Concept Videos

Ischemic Stroke ll: Pathophysiology01:15

Ischemic Stroke ll: Pathophysiology

68
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...
68
Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

507
Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
507
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

2.0K
Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
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Ischemic Stroke l: Introduction01:15

Ischemic Stroke l: Introduction

53
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.
53
Factors Affecting Drug Distribution: Organ Perfusion Rate01:15

Factors Affecting Drug Distribution: Organ Perfusion Rate

837
Drug distribution within the body is a complex process influenced by several factors, including perfusion rate, the rate at which the bloodstream transports drugs to tissue. This limitation becomes particularly significant when dealing with highly lipophilic drugs. In such cases, the rate at which the drug can move across membranes is crucial, and if the membrane is highly permeable to the drug, distribution becomes rate-limited by perfusion.
Perfusion rate-limited distribution relies on the...
837

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Related Experiment Video

Updated: May 6, 2026

Optimized System for Cerebral Perfusion Monitoring in the Rat Stroke Model of Intraluminal Middle Cerebral Artery Occlusion
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Translational perspectives on perfusion-diffusion mismatch in ischemic stroke.

Bruce C V Campbell1, I Mhairi Macrae

  • 1Department of Medicine and Neurology, Melbourne Brain Centre at the Royal Melbourne Hospital, University of Melbourne, Victoria, Australia.

International Journal of Stroke : Official Journal of the International Stroke Society
|November 13, 2013
PubMed
Summary

Magnetic resonance imaging (MRI) advances stroke understanding. Perfusion-diffusion mismatch, refined by clinical and preclinical studies, is now key for guiding thrombolytic therapy in stroke trials and practice.

Keywords:
MRIdiffusion imagingpenumbraperfusion imagingstrokethrombolytic therapy

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Area of Science:

  • Neuroimaging
  • Neurology
  • Medical Imaging

Background:

  • Magnetic resonance imaging (MRI) shows promise for understanding ischemic stroke.
  • Current clinical MRI applications for stroke are primarily in research settings.
  • Refined selection criteria from clinical studies improve risk-benefit analysis for thrombolytic therapy.

Purpose of the Study:

  • To review clinical and preclinical advancements in MRI for ischemic stroke.
  • To highlight the application of perfusion-diffusion mismatch in stroke treatment decisions.
  • To discuss the potential for routine clinical use of advanced MRI techniques.

Main Methods:

  • Review of major clinical studies and preclinical research in ischemic stroke.
  • Analysis of imaging data, focusing on perfusion-diffusion mismatch.
  • Evaluation of risk vs. benefit for thrombolytic therapy guided by MRI.

Main Results:

  • Clinical studies have refined patient selection criteria for thrombolytic therapy.
  • Preclinical studies offer insights into stroke evolution difficult to obtain in humans.
  • Perfusion-diffusion mismatch is increasingly utilized in Phase 3 randomized trials.

Conclusions:

  • MRI techniques, particularly perfusion-diffusion mismatch, are crucial for advancing ischemic stroke knowledge.
  • These imaging advancements are transitioning from trials to potential routine clinical practice.
  • Optimized MRI application can enhance the efficacy and safety of stroke treatments.