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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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Repeated loading and damage progression in cerebral arteries.

Farshid Shojaeianforoud1, Leonardo Marin1, William J Anderl1

  • 1Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, USA.

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|March 16, 2025
PubMed
Summary

Repetitive head trauma causes cumulative damage to cerebral arteries, leading to progressive softening. This vascular damage may worsen traumatic brain injury (TBI) outcomes.

Keywords:
Collagen denaturationDamage accumulationPiglet cerebral arteriesRepetitive overstretchTraumatic brain injuryVessel softening

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Area of Science:

  • Biomedical Engineering
  • Mechanobiology
  • Neuroscience

Background:

  • Traumatic brain injury (TBI) is a significant public health concern.
  • The mechanical response of cerebral blood vessels to repetitive head trauma is not well understood.
  • Understanding vessel mechanics is crucial for predicting TBI progression.

Purpose of the Study:

  • To investigate the mechanical response of cerebral arteries to repetitive overstretch.
  • To determine if repeated overstretch leads to cumulative damage in cerebral vessels.
  • To characterize the softening effects as a function of overstretch magnitude and repetitions.

Main Methods:

  • Piglet middle cerebral artery segments were subjected to high-rate, sub-yield overstretch.
  • Vessels underwent up to 10 repetitions of varying overstretch severities.
  • Stress-stretch behavior was analyzed to quantify mechanical changes.

Main Results:

  • Repetitive overstretch induced progressive softening, increasing with overstretch magnitude and repetitions.
  • Softening was primarily observed in the toe region of the stress-stretch curve.
  • Severe overstretches caused immediate softening, with minimal additional change from subsequent exposures.

Conclusions:

  • Repetitive overstretch causes cumulative damage and softening in cerebral arteries.
  • Progressive vessel softening may increase vulnerability and exacerbate TBI.
  • Findings inform constitutive damage models for improved TBI prediction.