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[Coronary angioscopy in ischemic heart disease]
A Hirayama1, M Asakura, O Yamaguchi
1Cardiovascular Division, Osaka Police Hospital.
Insights
Coronary angioscopy is a valid tool for assessing coronary interventions and atherosclerosis. It visualizes thrombus, plaque, and neointima changes, aiding treatment decisions and understanding disease progression.
Area of Science:
- Cardiovascular Medicine
- Medical Imaging
- Interventional Cardiology
Context:
- Coronary angiography has limitations in visualizing intraluminal details after interventions.
- Acute coronary syndromes involve complex plaque and thrombus formation.
- Atherosclerosis is a dynamic process involving plaque changes over time.
Purpose:
- To evaluate the clinical validity and applications of coronary angioscopy.
- To demonstrate angioscopy's ability to visualize intraluminal findings post-intervention.
- To highlight angioscopy's role in characterizing culprit lesions and monitoring atherosclerosis.
Summary:
- Coronary angioscopy effectively visualizes intraluminal findings missed by angiography, such as thrombus and protrusion, after chronic total occlusion intervention.
- Serial angioscopic observations show neointima changes after stent implantation, becoming thin and transparent by 3 years.
- Angioscopy reveals thrombus formation on yellow plaques in acute coronary syndromes, underscoring the need for anti-platelet therapy.
- The technique allows detection of early plaque formation, progression, and rupture, facilitating timely intervention.
Impact:
- Coronary angioscopy enhances the assessment of coronary interventions and provides insights into atherosclerosis.
- Findings support the utility of angioscopy in guiding treatment strategies for coronary artery disease.
- Early detection of plaque changes via angioscopy may enable preventative interventions against rupture.
Abstract:
The validity of coronary angioscope was discussed in several clinical settings in this article. First of all, although smooth coronary surface was observed by coronary angiography after the intervention of chronic total occlusion, protrusion or thrombus observed by angioscope occupied the arterial lumen and closed the vessel lumen. After implantation of the stent, lumen was widely opened. Serial angioscopic observation revealed that the neointima became thick and non-transparent until 6 months and then became thin and transparent by 3 years after stent implantation. These findings suggested the validity of angioscope in coronary intervention. Second, coronary angioscope revealed the morphologic and pathologic characteristics of culprit lesions in patients with acute coronary syndrome. The thrombus was observed on the yellow plaque in the culprit lesion. The thrombus formed directly over the plaque was mainly white and red thrombus might be formed after the blood flow was disturbed by the white thrombus formed by the platelet aggregation. These findings imply the importance of anti-platelet therapy after acute coronary syndromes. Finally, the angioscope can detect the minimal changes of the plaque formation, progression and rupture, that is, the entire process of the atherosclerosis. The early detection of yellow plaque might be able to intervent mechanically or pharmacologically to prevent its rupture.