The coronary artery bypass conduit: I. Intraoperative endothelial injury and its implication on graft patency

Area of Science:

• Cardiovascular Surgery
• Vascular Biology
• Biomedical Imaging

Background:

• Intraoperative injury to the vascular endothelium compromises aorto-coronary saphenous vein graft viability and patency.
• Endothelial dysfunction can result from surgical manipulation, ischemia, storage, and distension, leading to vasospasms, thrombosis, intimal hyperplasia, and stenosis.
• Endothelial injury serves as a precursor for atheroma formation and subsequent graft failure.

Purpose of the Study:

• To emphasize the critical role of preventing endothelial injury in maintaining saphenous vein graft patency.
• To outline a multifactorial strategy for preventing endothelial injury and graft failure.
• To highlight the potential of multiphoton imaging in assessing graft integrity.

Main Methods:

• Review of factors contributing to endothelial injury during vein graft procedures.
• Discussion of a multifactorial prevention strategy including surgical techniques, preservation methods, and pharmacologic interventions.
• Introduction of multiphoton imaging as a tool for evaluating bypass conduit integrity.

Main Results:

• Surgical manipulation, ischemia, storage, and distension significantly alter endothelial antithrombogenic properties.
• A multifactorial approach is essential for preventing endothelial injury and subsequent graft complications.
• Multiphoton imaging offers a novel method for assessing the structural and functional integrity of vascular grafts.

Conclusions:

• Preventing intraoperative endothelial injury is paramount for long-term aorto-coronary saphenous vein graft patency.
• A combined strategy of improved surgical practices, optimal preservation, and pharmacologic agents is recommended.
• Advanced imaging techniques like multiphoton imaging can aid in developing more effective strategies for graft patency.