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Related Concept Videos

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...

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Related Experiment Video

Updated: Jun 27, 2026

Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents
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Remote Ischemic Conditioning and Stroke Recovery.

Matthew W McDonald1,2, Angela Dykes1,2, Matthew S Jeffers1,2

  • 1University of Ottawa, ON, Canada.

Neurorehabilitation and Neural Repair
|May 6, 2021
PubMed
Summary
This summary is machine-generated.

Remote ischemic conditioning (RIC) shows neuroprotective effects in stroke models. Pre-stroke RIC significantly reduced infarct volume, but delayed RIC did not improve behavioral recovery.

Keywords:
brain repaircell deathneuroprotection

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Area of Science:

  • Neuroscience
  • Cardiovascular Medicine
  • Regenerative Medicine

Background:

  • Preclinical stroke recovery research often overlooks remote ischemic conditioning (RIC).
  • Existing studies primarily focus on neuroprotection, utilize male animals, and employ stroke models and timing irrelevant to clinical stroke repair.
  • This study addresses these limitations by investigating RIC's efficacy in both sexes and at clinically relevant time points.

Purpose of the Study:

  • To evaluate the neuroprotective effects of remote ischemic conditioning (RIC) in a preclinical stroke model.
  • To determine the optimal timing for RIC administration in relation to stroke onset.
  • To assess the impact of delayed RIC on long-term behavioral recovery after stroke.

Main Methods:

  • Standardized RIC sessions (5-minute inflation/deflation, 4 repetitions) were applied to the hindlimb of male and female Sprague-Dawley rats.
  • RIC was administered either 18 hours before stroke (pre-RIC) or 4 hours after stroke (post-RIC) using the endothelin-1 model.
  • Infarct volume was measured at 24 hours poststroke via MRI; chronic RIC (4 weeks) was initiated 5 days poststroke to assess behavioral recovery.

Main Results:

  • Pre-stroke RIC reduced infarct volume by 41%, while post-stroke RIC reduced it by 29%.
  • RIC demonstrated neuroprotective effects in both sexes, with males showing a 46% infarct reduction compared to 23% in females.
  • Chronic delayed RIC administration failed to improve poststroke behavioral recovery.

Conclusions:

  • Remote ischemic conditioning (RIC) is effective in reducing infarct volume in the acute phase of stroke.
  • Pre-stroke RIC offers greater neuroprotection than post-stroke RIC in this model.
  • The therapeutic window for RIC's beneficial effects appears limited to the hyperacute and early acute phases of stroke, suggesting it may not aid long-term behavioral recovery.