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Related Concept Videos

Aneurysm III: Interprofessional Care01:26

Aneurysm III: Interprofessional Care

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Aneurysm management involves either conservative medical therapy or surgical intervention, depending on the size and symptoms of the aneurysm. Conservative management is generally reserved for smaller, asymptomatic aneurysms, while larger or symptomatic aneurysms often necessitate surgical repair.Conservative Medical TherapyFor small, asymptomatic aneurysms, particularly abdominal aortic aneurysms (AAA) less than 5.5 centimeters in diameter, conservative medical therapy is recommended. This...
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Related Experiment Video

Updated: Nov 10, 2025

Creation of Two Saccular Elastase-Digested Aneurysms with Different Hemodynamics in One Rabbit
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Adaptive Remodeling in the Elastase-induced Rabbit Aneurysms.

C Sang1, D F Kallmes2, R Kadirvel2

  • 1Department of Mechanical Engineering and Materials Science, University of Pittsburgh, 3700 O'Hara Street, Pittsburgh, PA 15261.

Experimental Mechanics
|April 5, 2021
PubMed
Summary
This summary is machine-generated.

Brain aneurysm walls rapidly adapt to stress through collagen remodeling, forming a new layer to maintain structural integrity. This adaptive mechanism ensures stability until slower medial reorganization occurs, offering insights for new therapies.

Keywords:
animal modelaxial loadingcerebral aneurysmcollagen remodelingconstitutive modeling

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Area of Science:

  • Biomedical Engineering
  • Vascular Biology
  • Materials Science

Background:

  • Brain aneurysm rupture carries high fatality and morbidity.
  • Aneurysm walls can adapt via collagen matrix remodeling, maintaining stability despite geometric changes.

Purpose of the Study:

  • To investigate adaptive remodeling in an elastase-induced rabbit aneurysm model.
  • To characterize the structural changes in aneurysm walls over time.

Main Methods:

  • Saccular aneurysms were created in 22 rabbits.
  • Aneurysm wall remodeling was assessed at 2, 4, 8, and 12 weeks post-creation.
  • A constitutive model was developed incorporating observed remodeling.

Main Results:

  • Intramural stress ratio doubled post-aneurysm creation, triggering remodeling.
  • A new multi-directional collagen layer formed between 2-4 weeks (50.6 ± 14.3 μm thick).
  • Collagen fibers in the new layer were multi-directional and less tortuous than medial and adventitial fibers.

Conclusions:

  • A novel mechanism of rapid aneurysm wall adaptation to stress was identified.
  • This rapid adaptation ensures structural integrity until slower medial reorganization.
  • The rabbit model is suitable for evaluating therapies to enhance aneurysm stability.