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Angioscopic evaluation of periprocedural and postprocedural abrupt closure after percutaneous coronary angioplasty
M A Sassower1, G S Abela, J M Koch
1Cardiovascular Division, Deaconess Hospital, Harvard Medical School, Boston, MA 02215.
Insights
Abrupt closure after percutaneous coronary angioplasty (PTCA) is unpredictable. New angioscopy allows direct visualization, revealing causes like plaque extrusion or thrombus for better treatment.
Area of Science:
- Cardiology
- Interventional Cardiology
- Medical Imaging
Background:
- Abrupt closure is a significant complication of percutaneous coronary angioplasty (PTCA).
- Current prevention and treatment strategies are often empiric due to unpredictable causes.
- High rates of myocardial infarction and mortality are associated with abrupt closure.
Observation:
- A novel angioscope enabling continuous, uninterrupted intracoronary visualization was utilized.
- Two cases of abrupt closure following PTCA were examined using this new angioscopy technique.
Findings:
- In one patient, angioscopy showed lumen obstruction due to extruded plaque material.
- In the second patient, imaging revealed a large platelet thrombus at the site of occlusion.
- Direct visualization identified specific mechanisms underlying abrupt closure.
Implications:
- Intracoronary angioscopy can identify specific causes of abrupt closure.
- Understanding mechanisms may lead to more targeted and effective therapeutic interventions.
- This technique could improve risk stratification and patient outcomes in interventional cardiology.
Abstract:
Abrupt closure remains a significant complication of PTCA. On the basis of the presumption of underlying cause (thrombus, dissection, spasm), various empiric medical and mechanical interventions have been used to prevent and/or treat this event. Despite these measures, however, abrupt closure remains a highly unpredictable occurrence with a substantial incidence of myocardial infarction and angioplasty-related morbidity and mortality. Direct visualization of the site of abrupt closure may allow determination of responsible mechanisms and appropriate treatment strategies. Intracoronary visualization using a new angioscope was carried out in two cases of abrupt closure after percutaneous coronary angioplasty. The angioscope features a movable fiberoptic bundle that provides continuous and uninterrupted imaging of the coronary artery segment incorporating the site of abrupt closure. In one patient with intraprocedural closure angioscopy revealed obstruction of the lumen with extruded plaque material. In a second patient with postprocedural closure, however, imaging at the site of coronary artery occlusion revealed a mass consistent with a large platelet thrombus. Intracoronary evaluation with angioscopy may yield important characteristics that identify lesions at risk for abrupt closure. Further elucidation of the mechanisms underlying abrupt closure may allow more appropriate selection of therapeutic interventions.