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Static circumferential tangential modulus of human atherosclerotic tissue
H M Loree1, A J Grodzinsky, S Y Park
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge.
Journal of Biomechanics
|February 1, 1994
Summary
Atherosclerotic plaque
Area of Science:
- Biomedical Engineering
- Cardiovascular Research
- Materials Science
Background:
- Atherosclerotic plaque rupture is a primary cause of myocardial infarction.
- Understanding plaque's mechanical properties is crucial for predicting rupture.
- Tensile stress significantly influences plaque behavior.
Purpose of the Study:
- To investigate how plaque structure and tensile stress affect its static circumferential tangential modulus.
- To compare the tensile properties of cellular, hypocellular, and calcified plaques.
Main Methods:
- Studied stress-strain behavior of 26 human aortic intimal plaques.
- Classified plaques histologically: cellular, hypocellular, and calcified.
- Applied physiologic circumferential tensile stress (25 kPa) and measured tangential modulus.
Main Results:
- Tangential moduli at 25 kPa were similar across cellular, hypocellular, and calcified plaques (p > 0.05).
- This contrasts with significant differences observed in radial compressive modulus.
- All plaques showed a significant increase in tangential modulus with increasing tensile stress.
Conclusions:
- The static circumferential tangential modulus of atherosclerotic plaque is not significantly influenced by cellularity or calcification.
- Tensile properties differ markedly from compressive properties in response to plaque composition.
- Plaque's mechanical response in tension is stress-dependent, not composition-dependent.