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Predictors of major ischemic complications after coronary dissection following angioplasty
M R Bell1, G S Reeder, K N Garratt
1Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic, Rochester, Minnesota 55905.
Insights
Coronary artery dissection after angioplasty can lead to complications. Key predictors of major ischemic events include transient occlusion, significant residual stenosis, and longer dissection length.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Coronary dissection is a known complication of coronary angioplasty.
- The decision for further treatment of dissections with a patent artery can be challenging.
- Predicting ischemic complications is crucial for patient management.
Purpose of the Study:
- To identify predictors of major ischemic complications in patients with coronary dissection after angioplasty.
- To differentiate dissections that require intervention from those that do not.
Main Methods:
- A case-control study design was employed.
- Fifty-eight patients with coronary dissections and subsequent ischemic events were matched with 58 control subjects with dissections but no events.
- Angiograms were analyzed by an independent examiner unaware of patient outcomes.
Main Results:
- Current smokers were more frequent in the complication group (31% vs 16%).
- Cases had smaller residual luminal diameter (1.2 vs 1.6 mm) and greater relative stenosis (59% vs 43%) at the dissection site.
- Dissections were longer in cases (11 vs 7 mm).
- Transient occlusion during the procedure was significantly higher in cases (47% vs 5%).
- Independent predictors of major ischemic events included transient occlusion, residual stenosis ≥70%, and dissection length ≥6 mm.
Conclusions:
- Transient occlusion, significant residual stenosis, and dissection length are independent predictors of major ischemic events following coronary dissection.
- These findings can aid in clinical decision-making regarding the management of coronary dissections after angioplasty.
Abstract:
Coronary dissection is a major cause of abrupt arterial closure after coronary angioplasty but may also be associated with no discernible event. Deciding which dissections should receive further treatment is often a dilemma if the artery remains patent. This case-control study examined predictors of major ischemic complications after coronary dissections. Fifty-eight patients with coronary dissections, but a patent artery at the completion of the angioplasty procedure, subsequently had in-hospital abrupt arterial closure, acute myocardial infarction, emergency coronary bypass surgery, or died; they were matched to 58 control subjects with dissection but no event. Analysis of each angiogram was performed with the examiner unaware of patient's history. Baseline angiographic and clinical characteristics of cases and controls were similar except for an excess of current smokers among the cases (31 vs 16%; p = 0.048). Residual luminal diameter at the dissection site was 1.2 +/- 0.6 mm (cases) versus 1.6 +/- 0.6 mm (controls; p = 0.001) with relative stenosis of 59 +/- 21% vs 43 +/- 21%, respectively (p = 0.0001). Dissections among cases were longer than among controls (11 +/- 7 mm vs 7 +/- 4 mm; p = 0.001). No significant difference was found in dissection morphology using 2 classification schemes or in final Thrombolysis in Myocardial Infarction study flow grade. Transient occlusion during the procedure, however, occurred in 47% of cases versus 5% of controls (p = 0.0001). Transient occlusion, residual percent stenosis > or = 70%, and dissections > or = 6 mm were independently predictive of major ischemic events.