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Risk profile and 3-year outcomes from the SYNTAX percutaneous coronary intervention and coronary artery bypass
Stuart J Head1, David R Holmes, Michael J Mack
1Department of Cardiothoracic Surgery, Erasmus University Medical Center, Rotterdam, the Netherlands.
Insights
Percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) were evaluated in patients unsuitable for the alternative. PCI patients had higher major adverse cardiac or cerebrovascular event (MACCE) rates than CABG patients.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Surgery
Background:
- Limited data exists on the risk profiles and outcomes for patients exclusively suited for PCI or CABG.
- Real-world data is crucial for understanding treatment efficacy in specific patient subgroups.
Purpose of the Study:
- To assess the real-world application and outcomes of percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) in patients for whom the alternative revascularization strategy was not suitable.
- To evaluate the risk profile and major adverse cardiac or cerebrovascular event (MACCE) rates in these specific patient populations.
Main Methods:
- The SYNTAX trial enrolled patients deemed suitable for either PCI or CABG, with a subset randomized if clinical equipoise existed.
- Patients unsuitable for one procedure were assigned to a registry for the other (PCI-ineligible CABG registry or CABG-ineligible PCI registry).
- Major adverse cardiac or cerebrovascular event (MACCE) rates were observed and reported as observational data.
Main Results:
- A significant proportion of patients (6.4% for PCI, 35.0% for CABG) were treated in registries due to unsuitability for the alternative.
- High-risk surgical patients undergoing PCI exhibited a 3-year MACCE rate of 38.0%, compared to 16.4% for patients undergoing CABG not suitable for PCI.
- Increasing SYNTAX scores correlated with higher MACCE rates in both PCI and CABG registry groups.
Conclusions:
- PCI and CABG remain essential treatment options for specific patient groups unable to undergo the alternative procedure.
- Patients with major comorbidities deemed inoperable and treated with PCI experienced high MACCE rates.
- Excellent surgical outcomes were observed in patients not suitable for PCI, highlighting the importance of CABG in specific complex cases.
Objectives:
The aim of this study was to evaluate the use of percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) in "real-world" patients unsuitable for the alternative treatment.
Background:
No data are available on the risk profile and outcomes of patients that can only undergo PCI or CABG.
Methods:
In the SYNTAX (Synergy between PCI with TAXUS and Cardiac Surgery) trial, a multidisciplinary Heart Team reached a consensus on whether PCI and CABG could result in clinical equipoise; if so, the patient was randomized. If not, the patient was enrolled in a CABG-ineligible PCI registry or PCI-ineligible CABG registry. A proportion (60%) of patients in the CABG registry was randomly assigned to be followed up for 5 years. No statistical comparisons were performed between randomized and registry patients. Major adverse cardiac or cerebrovascular event (MACCE) rates are presented as observational only.
Results:
A total of 3,075 patients were treated in the SYNTAX trial; 198 (6.4%) and 1,077 (35.0%) patients were included in PCI and CABG registries, respectively. The main reason for inclusion in the CABG registry was too complex coronary anatomy (70.9%), and the main reason for inclusion in the PCI registry was too high-risk for surgery (70.7%). Three-year MACCE was 38.0% after PCI and 16.4% after CABG. Stratification by SYNTAX score terciles demonstrated a step-wise increase of MACCE rates in both PCI and CABG registries.
Conclusions:
The SYNTAX Heart Team concluded that PCI and CABG remained the only treatment options for 6.4% and 35.0% of patients, respectively. Inoperable patients with major comorbidities that underwent PCI had high MACCE rates. In patients not suitable for PCI, surgical results were excellent. (SYNTAX Study: TAXUS Drug-Eluting Stent Versus Coronary Artery Bypass Surgery for the Treatment of Narrowed Arteries, NCT00114972).
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