A second arterial conduit to the circumflex circulation significantly improves survival after coronary artery bypass
Suvitesh Luthra1, Miguel M Leiva-Juárez2, Anil John1
1Division of Cardiac Surgery, Derriford Hospital, Plymouth, Devon, UK.
Insights
Using a second arterial graft in coronary artery bypass surgery significantly improves survival. This approach offers substantial early and long-term benefits compared to traditional methods using venous grafts.
Area of Science:
- Cardiovascular Surgery
- Thoracic Surgery
- Medical Research
Background:
- Conventional coronary artery bypass surgery (CABS) typically uses a single left internal mammary artery (LIMA) graft.
- Saphenous vein grafts are commonly used for other arterial sites, but their long-term patency can be a concern.
- The impact of utilizing a second arterial conduit to the left-sided circulation beyond the LIMA is not fully established.
Purpose of the Study:
- To investigate the effect of a second arterial conduit to the circumflex circulation on early and long-term survival after CABS.
- To compare survival outcomes between patients receiving a second arterial graft versus a venous graft to the left-sided circulation.
Main Methods:
- A retrospective propensity-matched study was conducted using data from 2004 to 2014.
- Patients undergoing revascularization with at least one arterial and/or venous graft to the circumflex circulation, in addition to an LIMA to the LAD, were included.
- Propensity matching was used to create comparable groups, and survival was analyzed using Cox regression and Kaplan-Meier curves.
Main Results:
- 1226 patients with a venous conduit were matched to an equal number with an arterial conduit.
- A second arterial graft to the circumflex circulation was a significant predictor of improved survival (HR 0.64).
- Survival rates at 1 year (98.2% vs 96.3%) and 10 years (82.4% vs 62.2%) were significantly higher in the arterial graft group.
Conclusions:
- Utilizing a second arterial conduit to the circumflex circulation provides significant survival benefits.
- These benefits are observed in both early and late postoperative periods.
- This finding supports the consideration of a second arterial graft in CABS for improved patient outcomes.
Objectives:
Conventional coronary artery bypass surgery involves the use of a single left internal mammary artery to the left anterior descending artery and saphenous vein grafts reserved for other sites. This retrospective propensity-matched study investigated the impact of a second arterial conduit to the left-sided circulation on early and long-term survival after coronary artery bypass surgery.
Methods:
Data were retrospectively collected from 2004 to 2014 for all revascularizations with at least 1 arterial and/or 1 venous graft to the circumflex circulation, in addition to an internal mammary artery to the left anterior descending artery. Propensity-matched groups were created based on baseline characteristics. Hazard functions were estimated using Cox multivariable regression, and the Kaplan-Meier survival curves were compared between the matched cohorts.
Results:
A total of 1226 patients with a venous conduit to the left-sided circulation were successfully matched to an equal number of patients with an arterial conduit. Regression analysis identified a second arterial conduit, logistic European System for Cardiac Operative Risk Evaluation score (EuroSCORE), pulmonary disease, left ventricular ejection fraction, New York Heart Association (NYHA) Class and previous myocardial infarction as significant predictors of survival. A second arterial graft to the left circumflex circulation was a predictor of improved survival (hazard ratio 0.64, 95% confidence interval 0.51-0.80; P < 0.001). There were significant early and late survival benefits (arterial vs venous: 98.2% vs 96.3%, P = 0.003 at 1 year; 82.4% vs 62.2%, P < 0.001 at 10 years) from a second arterial conduit to the circumflex circulation.
Conclusions:
There are significant early and late incremental survival benefits from a second arterial conduit to the circumflex circulation.
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