Impact of calcium quantifications on stent expansions

Pengfei Dong, Hiram G. Bezerra, David L. Wilson, Linxia Gu

Research output: Contribution to journalArticle

Abstract

Severely calcified plaque is of great concern when planning and implementing a stenting intervention. In this work, computational models were developed to investigate the influence of calcium characteristics on stenting outcomes. The commonly used clinical measurements of calcium (i.e., the arc angle, maximum thickness, length, and volume) were varied to estimate stenting outcomes in terms of lumen gain, stent underexpansion, strut malapposition, and stress or strain distributions of the stenotic lesion. Results have shown that stenting outcomes were most sensitive to the arc angle of the calcium. A thick calcium with a large arc angle resulted in poor stenting outcomes, such as severe stent underexpansion, D-shaped lumen, increased strut malapposition, and large stresses or strains in the plaque. This was attributed to the circumferential stretch of the tissue. Specifically, the noncalcium component was stretched significantly more than the calcium. The circumferential stretch ratios of calcium and noncalcium component were approximately 1.44 and 2.35, respectively, regardless of calcium characteristics. In addition, the peak stress or strain within the artery and noncalcium component of the plaque occurred at the area adjacent to calcium edges (i.e., the interface between the calcium and the noncalcium component) coincident with the location of peak malapposition. It is worth noting that calcium played a protective role for the artery underneath, which was at the expense of the overstretch and stress concentrations in the other portion of the artery. These detailed mechanistic quantifications could be used to provide a fundamental understanding of the impact of calcium quantifications on stent expansions, as well as to exploit their potential for a better preclinical strategy.

Original languageEnglish (US)
Article number021010
JournalJournal of Biomechanical Engineering
Volume141
Issue number2
DOIs
StatePublished - Feb 1 2019

Fingerprint

Stents
Calcium
Arteries
Struts
Stress concentration
Tissue

Keywords

  • Arc angle
  • Arterial stress
  • Calcium
  • D-shaped lumen
  • Finite element method
  • Malapposition
  • Percutaneous coronary intervention
  • Stent deployment
  • Stent underexpansion

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)

Cite this

Impact of calcium quantifications on stent expansions. / Dong, Pengfei; Bezerra, Hiram G.; Wilson, David L.; Gu, Linxia.

In: Journal of Biomechanical Engineering, Vol. 141, No. 2, 021010, 01.02.2019.

Research output: Contribution to journalArticle

Dong, Pengfei ; Bezerra, Hiram G. ; Wilson, David L. ; Gu, Linxia. / Impact of calcium quantifications on stent expansions. In: Journal of Biomechanical Engineering. 2019 ; Vol. 141, No. 2.
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