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Evaluation of restenosis in major vessels and side branches
Teruo Okabe1, Yasushi Asakura, Keiko Asakura
1Cardiopulmonary Division, Department of Medicine, Keio University School of Medicine, Shinano-machi 35, Shinjuku-ku, Tokyo 160-8582.
Insights
Treating a side branch during main vessel stenosis intervention is not always necessary. Main vessel restenosis, not initial side branch treatment, significantly impacts side branch restenosis. This finding aids clinical decision-making in complex coronary interventions.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Coronary artery disease management often involves treating stenotic main vessels.
- The decision to concurrently intervene on a stenotic side branch during main vessel treatment requires careful consideration.
- Understanding factors influencing side branch restenosis is crucial for optimizing patient outcomes.
Purpose of the Study:
- To investigate the indications for concurrent intervention of a side branch during main vessel stenosis treatment.
- To evaluate the impact of initial side branch treatment on subsequent restenosis.
- To identify predictors of side branch restenosis after coronary intervention.
Main Methods:
- Retrospective analysis of 451 patients with stenotic main vessel and side branch.
- Patients divided into two groups: side branch treated (Group I) and untreated (Group II).
- Quantitative coronary angiography used to assess minimum luminal diameter (MLD) and percentage diameter stenosis (%DS) of both vessels.
Main Results:
- Initially, Group I showed a larger MLD and smaller %DS in the side branch compared to Group II.
- At follow-up, these differences diminished, with similar MLD and %DS between groups.
- Main vessel restenosis was identified as a significant factor affecting side branch outcomes in both groups.
- Multivariate analysis revealed that the percentage diameter stenosis of the main vessel at follow-up was the sole significant predictor of side branch restenosis.
Conclusions:
- Restenosis of the main vessel is a more critical determinant of side branch restenosis than the initial treatment strategy for the side branch.
- Clinical decisions regarding concurrent side branch intervention should weigh the risk of main vessel restenosis.
- Further research may refine strategies for managing complex coronary lesions involving both main and side branches.
Objectives:
The indications for concurrent intervention for stenosis of a side branch during the treatment for stenosis of the main vessel were investigated using quantitative coronary angiography.
Methods:
The retrospective study included 451 patients treated for a stenotic main vessel incorporating a side branch, who underwent follow-up angiography within 6 months. Patients were divided into Group I with the side branch treated by coronary angioplasty, and Group II with the side branch left untreated. Quantitative coronary angiography was used to measure the minimum luminal diameter (MLD) and percentage diameter stenosis (%DS) of the main vessel and the side branch.
Results:
The MLD of the side branch after treatment was larger in Group I (1.4 +/- 0.1 mm) than in Group II (0.7 +/- 0.1 mm), and the %DS of the side branch after treatment was smaller in Group I (34 +/- 3%) than in Group II (63 +/- 2%). These differences decreased at follow-up to 1.1 +/- 0.1 mm, 48 +/- 2% in Group I; 0.9 +/- 0.04 mm, 46 +/- 2% in Group II, respectively. The MLD and %DS of the side branch at follow-up in Groups I and II were affected by the presence of main vessel restenosis[Restenosis(+): 0.9 +/- 0.1 mm, 57 +/- 4%; restenosis(-): 1.2 +/- 0.1 mm (p < 0.05), 43 +/- 3% (p < 0.05) in Group I; Restenosis(+): 0.9 +/- 0.1 mm, 51 +/- 8%; restenosis(-): 1.0 +/- 0.1 mm, 44 +/- 3% in Group II]. Multivariate analysis showed that %DS of the main vessel at follow-up was the only powerful predictor of restenosis of the side branch (p = 0.0249, odds ratio = 1.031, confidence interval = 1.004-1.059) in Groups I and II.
Conclusions:
Restenosis of the main vessel rather than the initial outcome of the side branch is the major influence on restenosis of the side branch.