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Multiple arterial grafts and survival
1Division of Cardiothoracic Surgery, Washington University School of Medicine, St. Louis, Missouri, USA. barnerh@msnotes.wustl.edu
Insights
Arterial conduits offer improved long-term outcomes for coronary artery bypass surgery compared to saphenous veins. Complete arterial revascularization may enhance freedom from reintervention, supporting the use of multiple arterial grafts.
Area of Science:
- Cardiovascular Surgery
- Vascular Grafting
- Coronary Artery Bypass Grafting (CABG)
Background:
- Saphenous vein grafts have limitations in long-term patency for bypass surgery.
- Internal thoracic artery grafts demonstrate improved survival, but benefits of additional arterial conduits were historically unclear.
- Evolving interest in various arterial conduits beyond the internal thoracic artery, including gastroepiploic, inferior epigastric, and radial arteries.
Purpose of the Study:
- To evaluate the efficacy of arterial conduits in coronary artery bypass surgery.
- To investigate the benefits of using multiple arterial grafts compared to traditional venous grafts.
- To assess the potential for improved long-term outcomes with complete arterial revascularization.
Main Methods:
- Review of existing literature and clinical evidence on arterial conduits for CABG.
- Analysis of factors influencing the success of additional arterial grafts.
- Comparison of outcomes between single arterial grafts, multiple arterial grafts, and saphenous vein grafts.
Main Results:
- The positive survival impact of the internal thoracic artery graft is well-established.
- Recent evidence confirms the benefit of a second arterial graft in CABG.
- While survival benefit from a third or fourth arterial graft may be difficult to demonstrate, complete arterial revascularization is associated with improved long-term freedom from reintervention.
Conclusions:
- Arterial conduits, particularly the internal thoracic artery, are superior to saphenous veins for long-term CABG outcomes.
- The use of multiple arterial grafts is increasingly supported by evidence.
- Complete arterial revascularization is a promising strategy for enhancing durability and reducing the need for repeat procedures in CABG patients.
Abstract:
Limitations in the long-term patency of saphenous veins for bypass grafts have encouraged interest in the use of arterial conduits. The positive effect of an internal thoracic artery graft on survival has been accepted for more than a decade, but it has proven difficult to show additional benefit from additional arterial conduits; this is probably due to multiple factors, including inappropriate choice of target vessels, short follow-up, and inadequate numbers of patients. Recently, however, the positive effect of a second arterial graft was confirmed. It will probably be difficult to show a survival benefit from a third or fourth arterial graft, but we believe that complete arterial revascularization will result in improved long-term freedom from reintervention. Interest in arterial conduits for coronary artery bypass was primarily limited to the left internal thoracic artery until the mid-1980s, when enthusiasm for the use of bilateral internal thoracic arteries grew. More recently, the gastroepiploic artery, the inferior epigastric artery, and especially the radial artery have all found advocates. However, the original conduit--and the standard against which all others are compared--is the greater saphenous vein.