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Published on: May 14, 2020
Predicted and Observed Mortality at 10 Years in Patients With Bifurcation Lesions in the SYNTAX Trial
Kai Ninomiya1, Patrick W Serruys2, Scot Garg3
1Department of Cardiology, National University of Ireland, Galway, Galway, Ireland.
Insights
Percutaneous coronary intervention (PCI) for bifurcation lesions is linked to higher 10-year mortality compared to coronary artery bypass grafting (CABG). The SYNTAX score 2020 aids in choosing the best treatment for these complex cases.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Surgery
Background:
- Percutaneous coronary intervention (PCI) for bifurcation lesions carries higher adverse event rates.
- The optimal treatment strategy (PCI vs. coronary artery bypass grafting [CABG]) for bifurcation lesions remains unclear for very long-term outcomes.
Purpose of the Study:
- To assess the impact of bifurcation lesions on predicted and observed 10-year all-cause mortality.
- To compare PCI and CABG in patients with and without bifurcation lesions using the SYNTAX score 2020.
Main Methods:
- Analysis of the SYNTAX Extended Survival (SYNTAXES) study data.
- Comparison of 10-year mortality between patients with (n=1,300) and without (n=487) bifurcation lesions.
- Utilized the SYNTAX score 2020 (SS-2020) for individual mortality prediction.
Main Results:
- PCI patients with >1 bifurcation lesion had higher all-cause death risk (30.1%) vs. no bifurcations (19.8%).
- CABG showed similar mortality for patients with (23.3%) and without (23.0%) bifurcation lesions.
- A 2-stent PCI technique was associated with increased mortality compared to a 1-stent technique.
Conclusions:
- Bifurcation lesions necessitate careful heart team consideration due to higher PCI-related 10-year mortality.
- Individualized prognosis using SS-2020 can guide treatment decisions for bifurcation lesions.
- SYNTAXES study provides crucial long-term data on PCI vs. CABG for bifurcation lesions.
Background:
Percutaneous coronary intervention (PCI) of bifurcation lesions is associated with higher rates of adverse events, and currently it is unclear whether PCI or coronary artery bypass grafting (CABG) is the safer treatment for these patients at very long-term follow-up.
Objectives:
The aim of this study was to investigate the impact of bifurcation lesions on individual predicted and observed all-cause 10-year mortality in the SYNTAX (Synergy Between PCI With Taxus and Cardiac Surgery) trial.
Methods:
In the SYNTAXES (SYNTAX Extended Survival) study, 10-year observed and individual predicted mortality derived from the SYNTAX score 2020 (SS-2020) was compared between patients with ≥1 bifurcation (n = 1,300) and those with no bifurcations (n = 487).
Results:
Among patients treated with PCI, patients with >1 bifurcation lesion compared with those without bifurcation lesions had a significantly higher risk for all-cause death (19.8% vs 30.1%; HR: 1.55; 95% CI: 1.12-2.14; P = 0.007), whereas following CABG, mortality was similar in patients with and those without bifurcation lesions (23.3% vs 23.0%; HR: 0.81; 95% CI: 0.59-1.12; P = 0.207; Pinteraction = 0.006). In PCI patients, a 2-stent vs a 1-stent technique was associated with higher mortality (33.3% vs 25.9%; HR: 1.51; 95% CI: 1.06-2.14; P = 0.021). According to the SS-2020, among those with ≥1 bifurcation, there was equipoise for all-cause mortality between PCI and CABG in 2 quartiles of the population, whereas CABG was superior to PCI in the 2 remaining quartiles.
Conclusions:
Bifurcation lesions require special attention from the heart team, considering the higher 10-year all-cause mortality associated with PCI. Careful evaluation of bifurcation lesion complexity and calculation of individualized 10-year prognosis using the SS-2020 may therefore be helpful in decision making. (Synergy Between PCI With TAXUS and Cardiac Surgery: SYNTAX Extended Survival [SYNTAXES], NCT03417050; Taxus Drug-Eluting Stent Versus Coronary Artery Bypass Surgery for the Treatment of Narrowed Arteries [SYNTAX], NCT00114972).
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