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Heterogeneous Intravascular Ultrasound Findings of Stent Thrombosis

Toru Morofuji1, Shinji Inaba, Hiroe Aisu

  • 1Department of Cardiology, Kitaishikai Hospital, Japan.

Internal Medicine (Tokyo, Japan)
|February 4, 2017
PubMed

Insights

Intravascular ultrasound (IVUS) revealed diverse causes for stent thrombosis, including neoatherosclerosis and malapposition. Understanding these mechanisms is crucial for preventing stent thrombosis events.

Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Biomedical Engineering

Background:

  • Stent thrombosis remains a significant complication following percutaneous coronary intervention.
  • The precise mechanisms underlying stent thrombosis, particularly very-late stent thrombosis, require further elucidation.

Purpose of the Study:

  • To investigate the morphological causes of definite stent thrombosis using intravascular ultrasound (IVUS).
  • To identify potential contributing factors to early, late, and very-late stent thrombosis.

Main Methods:

  • A retrospective analysis of 12 definite stent thrombosis cases treated between July 2011 and April 2016.
  • Intravascular ultrasound (IVUS) imaging was employed to assess stent morphology and identify potential causes of thrombosis.

Main Results:

  • IVUS detected morphological abnormalities in 10 out of 12 cases (83.3%), including neoatherosclerosis, stent malapposition, stent fracture, edge dissection, and stent underexpansion.
  • Neointimal hyperplasia was observed in all 12 cases, with plaque rupture noted in two.
  • Stent malapposition was identified in three very-late stent thrombosis cases, all associated with sirolimus-eluting stents.

Conclusions:

  • Stent thrombosis in patients presents with heterogeneous findings on IVUS, highlighting multiple potential underlying mechanisms.
  • This case series underscores the utility of IVUS in delineating the complex etiologies of stent thrombosis.

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