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Coronary angioscopy of abrupt occlusion after angioplasty
C J White1, S R Ramee, T J Collins
1Department of Invasive Cardiology, HCI International Medical Center, Clydebank, Scotland, United Kingdom.
Insights
Coronary dissection is the main cause of vessel occlusion after percutaneous transluminal coronary angioplasty. Angioscopy accurately identifies occlusion causes, unlike angiography, guiding better treatment strategies for abrupt vessel closure.
Area of Science:
- Cardiovascular Interventions
- Medical Imaging
- Interventional Cardiology
Background:
- Coronary artery occlusion post-angioplasty leads to significant morbidity and mortality.
- Angiography has limitations in accurately diagnosing the cause of post-angioplasty occlusion.
- Direct visualization via angioscopy offers a potentially more precise method for identifying occlusion causes.
Purpose of the Study:
- To determine the specific cause of vessel occlusion after percutaneous transluminal coronary angioplasty (PTCA) using angioscopy.
- To compare the accuracy of angioscopy versus angiography in identifying lesion morphologies causing post-PTCA occlusion.
Main Methods:
- Percutaneous coronary angioscopy was performed in 17 patients with confirmed post-angioplasty vessel occlusion.
- Angioscopic findings were compared with angiographic assessments of lesion morphology.
Main Results:
- Angioscopy identified dissection as the cause in 82% of cases and intracoronary thrombi in 18%.
- Angiography correctly identified the occlusion cause in only 29% of patients, significantly less accurate than angioscopy (p < 0.001).
Conclusions:
- Angioscopy precisely identified occlusion causes in all patients, with dissection being the primary factor.
- Angiography's inability to identify the cause in most cases highlights angioscopy's potential value.
- Angioscopy can guide tailored treatment strategies for abrupt post-angioplasty occlusion, including stent placement or thrombolysis.
Objectives:
This study used angioscopy to determine the specific cause of vessel occlusion after percutaneous transluminal coronary angioplasty and compared the angiographic and angioscopic lesion morphologies in this setting.
Background:
Occlusion of a dilated coronary artery is the major cause of morbidity and mortality after coronary angioplasty. Attempts to reopen occluded vessels are either empirically guided or directed by angiography, which has inherent limitations. Angioscopy, the in vivo direct visualization of the endovascular surface, is potentially a more accurate means of identifying the cause of vessel occlusion after angioplasty.
Methods:
Percutaneous coronary angioscopy was performed in 17 patients (17 vessels) after angiographic confirmation of postangioplasty vessel occlusion.
Results:
Angioscopy demonstrated the primary cause of the postangioplasty occlusion to be dissection in 14 patients (82%) and intracoronary thrombi in 3 (18%). Compared with angioscopy, angiography was significantly less accurate in identifying the specific cause of the occlusion and correctly identified the cause of vessel occlusion in only 5 (29%) of 17 patients (p < 0.001), including 4 (29%) of 14 deep dissections and 1 (33%) of 3 occlusive thrombi.
Conclusions:
Angioscopy specifically identified the cause of occlusion in every patient, with coronary dissection the predominant cause of abrupt occlusion after coronary angioplasty. However, angiography was unable to identify a specific cause for vessel occlusion in the majority of our patients. Angioscopy may therefore prove useful in selecting specific treatment strategies for patients with abrupt occlusion after angioplasty, such as stent placement, atherectomy, repeat dilation or thrombolysis.