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Prediction of acute closure in percutaneous transluminal coronary angioplasty
1Emory University School of Medicine, Atlanta, Georgia.
Insights
Percutaneous transluminal coronary angioplasty (PTCA) can lead to acute closure, often requiring bypass surgery. Identifying predictive factors and employing reopening techniques can improve outcomes for patients undergoing PTCA.
Area of Science:
- Cardiology
- Interventional Cardiology
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) has advanced, yet acute closure and myocardial infarction remain complications.
- Approximately two-thirds of patients experiencing acute closure require bypass surgery.
Purpose of the Study:
- To identify factors predicting acute closure after PTCA.
- To explore factors influencing the outcome of abrupt closure.
- To review management strategies for abrupt closure.
Main Methods:
- Analysis of independent factors predicting acute closure.
- Identification of procedural factors associated with acute closure.
- Review of factors predicting fatal outcomes.
- Evaluation of reopening techniques and new interventions.
Main Results:
- Predictive factors for acute closure include stenosis length, female gender, vessel tortuosity, thrombus, and multivessel disease.
- Procedural factors like post-PTCA stenosis, intimal tear, and high gradient predict closure.
- Fatal outcomes are associated with female gender, collateral channels, large jeopardized myocardium, and comorbidities.
Conclusions:
- Early identification of risk factors for acute closure is crucial.
- Reopening attempts, prolonged inflation, bailout catheters, and new techniques like stenting can manage dissections.
- Understanding predictive factors for both closure and fatal outcomes aids in patient management.
Abstract:
Despite significant advances in the technology of percutaneous transluminal coronary angioplasty (PTCA) and the ability to perform the procedure in more complex cases, there are still problems of acute closure and resultant acute myocardial infarction. Approximately two thirds of patients who undergo acute closure will require bypass surgery. Independent factors that can be predictive of patients who will undergo acute closure include stenosis length exceeding a two-lumen diameter, female gender, stenosis at a bend of 45 degrees or more, stenosis at a branching point, stenosis-associated thrombus or filling defect, other stenoses in the vessel undergoing dilatation, and multivessel disease. Factors that can be identified only at the time of the procedure are post-PTCA percentage of stenosis, an intimal tear or dissection, and a post-PTCA gradient of 20 mm Hg or more. The outcome of abrupt closure depends on several factors. The features that have been found to be predictive of fatal outcome are female gender, collateral channels originating from the dilated vessel, a large amount of jeopardized myocardium, left ventricular hypertrophy, hypertension before PTCA, diabetes, and multivessel disease. When abrupt closure occurs, attempts should be made to reopen the artery even if a decision has been made to proceed to bypass surgery. Techniques that can help when the artery cannot be kept open include prolonged inflation (3-5 minutes), use of a bailout or perfusion catheter, and infusion of an oxygenated perfluorochemical (Fluosol, Alpha Therapeutic Corp., Los Angeles, California). Intracoronary stenting and laser balloon angioplasty are new techniques that might prove useful in the management of the dissection that commonly leads to abrupt closure.