Related Experiment Video
Updated: Jul 5, 2026
Surgical Swine Model of Chronic Cardiac Ischemia Treated by Off-Pump Coronary Artery Bypass Graft Surgery
Published on: March 27, 2018
Angioscopic observation after coronary angioplasty for chronic coronary occlusion comparison with severe stenotic
T Adachi1, A Hirayama, M Asakura
1Department of Cardiology Osaka South National Hospital Osaka Japan.
Insights
Coronary angioplasty for chronic total occlusions shows higher restenosis due to intimal flaps. Angioscopy revealed significant lumen occlusion in total occlusion cases, unlike severe stenosis, explaining increased reocclusion risks.
Area of Science:
- Cardiology
- Interventional Cardiology
- Medical Imaging
Background:
- Coronary angioplasty for chronic total occlusion (CTO) exhibits a higher restenosis rate compared to severe coronary stenosis.
- The specific mechanisms behind this increased restenosis in CTO have not been fully elucidated through angioscopic observation.
Purpose of the Study:
- To investigate the underlying mechanisms contributing to the high restenosis rate following coronary angioplasty for CTO.
- To utilize coronary angioscopy for detailed visualization of lesion morphology post-intervention in CTO and severe stenosis.
Main Methods:
- A classification system for post-angioplasty lesion morphology was established, grading intimal flap presence and protrusion (Grade 0-3).
- Coronary angioscopy was performed on 46 patients with stable angina, including 13 with CTO and 36 with severe coronary stenosis.
- Lesion morphology was analyzed and compared between the CTO and severe stenosis groups.
Main Results:
- The majority of CTO lesions (13 patients) demonstrated Grade 3 morphology (protruding intimal flaps causing lumen occlusion) after angioplasty.
- In contrast, none of the severe coronary stenosis cases (36 patients) exhibited Grade 3 morphology.
- A significant difference in lesion morphology, specifically intimal flap protrusion, was observed between CTO and severe stenosis groups.
Conclusions:
- The presence of significant intimal flap protrusions into the lumen, as visualized by angioscopy, is a likely factor contributing to the higher restenosis and reocclusion rates after CTO angioplasty.
- These findings highlight the importance of angioscopic assessment in understanding and potentially mitigating restenosis after CTO interventions.
Abstract:
Objectives To clarify the underlying mechanism for the high restenosis rate after the coronary angioplasty for the chronic total occlusion by using the coronary angioscope. Background Coronary angioplasty for the chronic total occlusion is associated with higher restenosis rate than for highly stenotic lesion. However, the difference in the restenosis rate has not been discussed from the angioscopic observation.Methods and Results The lesion morphology after coronary intervention were classified into 4 grade (Grade 0 = no intimal flap; Grade 1 = intimal flap without protrusion; Grade 2 = Intimal flap with protrusion not occlusive; Grade 3 = protruding intimal flaps with occlusion of the vessel lumen). Coronary angioscopic observation was performed in 46 patients with stable angina. Most of the lesion morphology after angioplasty in 13 patients with chronic total occlusion was grade 3. On the other hand, none of grade 3 was observed in 36 patients with severe coronary stenosis.Conclusion The various protrusions into the lumen shown by the angioscope might be a reason for higher restenosis and reocclusion rates compared with those after the angioplasty for the severe stenotic lesion.
Related Concept Videos
01:30Acute Coronary Syndrome III: Diagnostic Studies
01:27Coronary Artery Disease V: Interprofessional Care
01:30Acute Coronary Syndrome I: Introduction
01:19Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations