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Related Experiment Video

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Measuring Ascending Aortic Stiffness In Vivo in Mice Using Ultrasound
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In vivo aortic elasticity measurement using electrocardiogram-gated computed tomography: validation with ex vivo

Junki Yokota1,2, Takashi Shirakawa1, Kazuo Shimamura1

  • 1Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.

Interdisciplinary Cardiovascular and Thoracic Surgery
|August 19, 2025
PubMed
Summary

A new noninvasive method using electrocardiogram-gated computed tomography (EGCT) accurately assesses aortic mechanical properties. This technique shows promise for improving risk stratification of aortic diseases beyond size alone.

Keywords:
aortic aneurysmascending aortaelectrocardiogram-gated computed tomographymechanical propertiesnoninvasive measurement

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Area of Science:

  • Cardiovascular imaging
  • Biomechanical engineering
  • Medical physics

Background:

  • Aortic aneurysm size is insufficient for predicting catastrophic events.
  • Aortic mechanical properties are crucial but difficult to measure noninvasively.
  • Current methods for assessing aortic mechanical properties are impractical for routine clinical use.

Purpose of the Study:

  • To validate a noninvasive electrocardiogram-gated computed tomography (EGCT)-based method for assessing aortic mechanical properties.
  • To compare in vivo EGCT measurements with ex vivo tensile testing of resected aortic specimens.
  • To establish the reliability and feasibility of EGCT for evaluating aortic stiffness and stored deformation energy.

Main Methods:

  • 49 patients undergoing ascending aorta surgical repair were analyzed.
  • Aortic mechanical properties (elastic modulus and strain energy) were measured using ex vivo tensile testing and in vivo EGCT.
  • Correlation, agreement (Bland-Altman), and reliability (ICC) between methods were assessed.

Main Results:

  • EGCT-based measurements strongly correlated with ex vivo testing for elastic modulus (r=0.733) and strain energy (r=0.773).
  • Good agreement was observed between methods, with minimal bias for elastic modulus.
  • Reliability was good-to-excellent for elastic modulus (ICC=0.86) and moderate for strain energy (ICC=0.63).

Conclusions:

  • Noninvasive EGCT measurement is a feasible and reliable method for assessing aortic mechanical properties.
  • This approach holds potential for enhancing risk stratification of aortic catastrophes.
  • Further research is needed to refine the predictive accuracy of this noninvasive technique.