Percutaneous angioscopy during coronary angioplasty using a steerable microangioscope.

Area of Science:

• Cardiovascular Medicine
• Medical Devices
• Interventional Cardiology

Background:

• Percutaneous coronary angioplasty (PCA) is a common procedure for treating coronary artery disease.
• Accurate visualization of coronary lesions is crucial for effective treatment and risk assessment.
• Existing diagnostic methods may have limitations in detecting subtle intimal abnormalities.

Purpose of the Study:

• To evaluate the feasibility and safety of using a flexible, steerable angioscope for coronary angioscopy.
• To assess the diagnostic capability of angioscopy in visualizing coronary lesions before and after PCA.
• To compare angioscopic findings with angiographic findings, particularly in patients with stable and unstable angina.

Main Methods:

• A flexible, steerable microangioscope was used, fitting through an 8F guiding catheter.
• Angioscopy was performed before and after PCA in 24 patients (6 stable, 18 unstable angina).
• Circumferential visualization success rates and operator experience impact were analyzed. Abnormal findings were documented and compared with angiography.

Main Results:

• Angioscopy was performed safely 45 times in 24 patients without complications.
• Successful circumferential visualization of target lesions was achieved in 83% of patients, improving with experience.
• Angioscopy detected thrombus and intimal dissection more frequently than angiography, especially in unstable angina patients.
• Lesion morphology in restenosis cases differed significantly from de novo lesions.

Conclusions:

• High-resolution percutaneous coronary angioscopy is a safe and feasible diagnostic tool.
• Angioscopy offers superior detection of thrombus and intimal dissection compared to angiography.
• Further clinical investigation is warranted to establish its role in routine practice.