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Coronary bifurcation lesions: Present status and future perspectives
Massoud A Leesar1, Abdul Hakeem2, Kasra Azarnoush3
1University of Alabama at Birmingham, United States.
Insights
Coronary bifurcation lesions (CBLs) require careful treatment. Current strategies show mixed results, highlighting the need for functional assessment like fractional flow reserve (FFR) to improve patient outcomes.
Area of Science:
- Interventional Cardiology
- Cardiovascular Research
- Medical Device Technology
Background:
- Coronary bifurcation lesions (CBLs) present unique challenges, leading to higher adverse event rates compared to non-bifurcation lesions.
- Current treatment strategies for CBLs include complex two-stent techniques and simpler provisional stenting, with varying clinical outcomes.
- Dedicated bifurcation stents and routine complex techniques have shown increased risks of myocardial infarction in some studies.
Purpose of the Study:
- To review current concepts and future perspectives in managing coronary bifurcation lesions.
- To emphasize the emerging importance of fractional flow reserve (FFR) for functional assessment of side branches in CBLs.
- To address the lack of randomized data on FFR's role in long-term CBL outcomes.
Main Methods:
- Review of existing meta-analyses and clinical studies on coronary bifurcation lesion treatment strategies.
- Discussion of findings from trials comparing simple versus complex stenting techniques.
- Examination of evidence regarding dedicated bifurcation stents and kissing balloon inflation (KBI).
Main Results:
- Meta-analyses indicate a higher incidence of myocardial infarction with complex stenting strategies compared to simple provisional stenting.
- Dedicated bifurcation stents (e.g., Tryton) have been associated with increased myocardial infarction rates.
- Studies show conflicting results on the benefit of routine kissing balloon inflation (KBI) for side branch stenosis.
Conclusions:
- The optimal interventional strategy for CBLs remains debated, with evidence suggesting potential harm from complex techniques and dedicated stents in certain scenarios.
- Fractional flow reserve (FFR) assessment of the side branch is crucial but lacks robust randomized data for long-term outcomes.
- Future research should focus on randomized trials evaluating FFR-guided management of CBLs to optimize patient care.
Abstract:
Coronary bifurcation lesions (CBLs) are challenging and associated with a higher rate of adverse events than non-bifurcation lesions. In the era of drug-eluting stents, 2 primary interventional strategies for treating CBL include the complex strategy the main vessel (MV) and side-branch (SB) stenting, and the simple strategy MV stenting combined with provisional SB stenting. The meta-analysis of the simple vs. complex strategies demonstrated an increased incidence of myocardial infarction in the complex strategy. Likewise, the Tryton dedicated bifurcation stents, as compared with the simple strategy, increased the rate of myocardial infarction. In contrast, the Nordic-Baltic Bifurcation Study IV demonstrated that event rates were not significantly different comparing the simple vs. complex strategies in true bifurcation lesions involving a large SB. Fractional flow reserve (FFR) has emerged as a powerful catheter based tool for the functional assessment of a stenosis, but the role of FFR on the long-term outcomes of patients with CBL has not been studied. Given the recent evidence that Tryton stents (a dedicated bifurcation stent) increased event rates, and the lack of benefit from using 2-stent techniques (the Nordic Baltic Bifurcation Study IV) in true CBL, assessing the FFR of the SB seems now of outmost importance, but randomized data are lacking. An intravascular study showed that kissing balloon inflation (KBI) significantly reduced SB stenosis, restored stent lumen at the carina, and expanded stent in the proximal segment. However, a recent randomized study showed no significant benefit of routine KBI. This review highlights current concepts and future perspectives in patients with CBL.
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