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Histopathology of Coronary Artery Chronic Total Occlusions and Its Relevance to Percutaneous Recanalization

Mariem A Sawan1, Rebecca Steinberg1, Aloke V Finn2

  • 1Division of Cardiology, Department of Medicine, Duke University, Durham, NC, USA.

Interventional Cardiology Clinics
|November 23, 2025
PubMed

Insights

Coronary chronic total occlusions (CTOs) are complex, dynamic lesions. Understanding their histopathology, including calcification and fibrosis, is crucial for successful percutaneous coronary intervention.

Area of Science:

  • Interventional Cardiology
  • Pathology

Background:

  • Coronary chronic total occlusions (CTOs) are defined as complete coronary artery obstructions with TIMI 0 flow for 3 months or more.
  • CTOs represent a highly challenging subset of lesions in interventional cardiology.

Purpose of the Study:

  • To elucidate the histopathological characteristics of CTOs.
  • To understand the dynamic and evolving nature of CTOs.
  • To correlate histopathologic insights with percutaneous coronary intervention techniques.

Main Methods:

  • Histopathological analysis of CTO lesions.
  • Examination of lesion composition, including thrombosis, inflammation, neovascularization, fibrosis, and calcification.
  • Assessment of calcification distribution, vessel layer composition, and tissue fiber orientation.

Main Results:

  • CTOs are not static but dynamic, evolving entities.
  • Lesion composition involves a complex interplay of thrombosis, inflammation, neovascularization, fibrosis, and calcification.
  • Specific features like calcification distribution and fiber orientation are key.

Conclusions:

  • Pathologic insights into CTOs are fundamental for modern percutaneous coronary intervention.
  • Understanding the dynamic nature and composition of CTOs improves treatment strategies.

Keywords:
Chronic total occlusionsCoronary artery diseaseIntimal plaqueMedial atrophyPercutaneous coronary intervention

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