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Coronary artery bypass graft surgery using the radial artery as a secondary conduit improves patient survival
John Lin1, Wen Cheng, Lawrence S Czer
1Division of Cardiothoracic Surgery, Cedars Sinai Heart Institute, Los Angeles, CA.
Insights
The radial artery (RA) offers superior long-term survival compared to saphenous vein grafts in coronary artery bypass graft surgery (CABG). This survival benefit is particularly notable in diabetic patients, women, and the elderly, emerging after five years.
Area of Science:
- Cardiovascular Surgery
- Vascular Grafting
- Clinical Outcomes Research
Background:
- The left internal thoracic artery is a standard for coronary artery bypass graft surgery (CABG).
- Long-term outcomes of using the radial artery (RA) versus saphenous vein grafts as secondary conduits in CABG are not well-established.
- Limited data exist comparing RA and saphenous vein grafts for long-term efficacy in CABG.
Purpose of the Study:
- To compare the 12-year survival outcomes of radial artery (RA) versus saphenous vein grafts as secondary conduits in coronary artery bypass graft surgery (CABG).
- To evaluate the long-term efficacy of RA grafts in specific patient subgroups, including diabetics, women, and the elderly.
Main Methods:
- A propensity-matched analysis of 260 pairs of first-time isolated CABG patients (1996-2001) was conducted.
- Multivariable logistic regression identified 18 baseline characteristics to define propensity for RA graft use.
- Kaplan-Meier method estimated cumulative 12-year survival, comparing RA and saphenous vein grafts.
Main Results:
- Radial artery (RA) grafts were associated with higher 12-year cumulative survival (hazard ratio 0.76; P=0.03) compared to saphenous vein grafts.
- A significant survival advantage for RA grafts was observed in diabetic patients (P=0.005), women (P=0.02), and the elderly (P=0.04).
- The protective effect of RA grafts became apparent approximately five years post-surgery.
Conclusions:
- The radial artery (RA) serves as a superior secondary conduit in coronary artery bypass graft surgery (CABG), enhancing long-term patient survival.
- This survival benefit is particularly pronounced in diabetic patients, women, and the elderly, manifesting more than five years after the procedure.
Background:
The clinical benefits of the left internal thoracic artery-to-left anterior descending coronary artery graft are well established in coronary artery bypass graft surgery (CABG). However, limited data are available regarding the long-term outcome of the radial artery (RA) as a secondary conduit over the established standard of the saphenous venous graft.
Methods And Results:
We compared the 12-year survival outcome in a set of propensity-matched CABG patients who received either the RA or the saphenous vein as a secondary conduit. A multivariable logistic regression that included 18 baseline characteristics was used to define the propensity of receiving an RA graft. The propensity model resulted in 260 matched pairs who underwent first-time isolated CABG from 1996 to 2001 with similar preoperative characteristics (C statistic=0.86). The cumulative 12-year survival estimated by use of the Kaplan-Meier method was higher for the RA graft patients (hazard ratio 0.76; P=0.03). This survival advantage was especially significant in diabetics (P=0.005), in women (P=0.02), and in the elderly (P=0.04.) The protective effect appeared beginning at year 5 post surgical intervention.
Conclusion:
The RA as a secondary conduit provided superior long-term survival after CABG, especially in diabetic patients, women, and the elderly. This effect was most pronounced >5 years after surgery.
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