Key result
IMA grafts show almost no endothelial damage versus SV grafts with large thrombogenic defects.
Why the study?
Do internal mammary artery grafts exhibit less endothelial damage compared to saphenous vein grafts in patients undergoing coronary artery revascularization?
Observational (n=11)
Do internal mammary artery grafts exhibit less endothelial damage compared to saphenous vein grafts in patients undergoing coronary artery revascularization?
The long-term clinical superiority of internal mammary artery grafts over saphenous vein grafts may be partly explained by the preservation of an intact, non-thrombogenic endothelium at the time of implantation.
Preserved IMA endothelium may partly explain graft superiority; case report leaves open generalizability and clinical impact.
The internal mammary artery (IMA) is a superior conduit for coronary artery revascularization and many factors have been suggested for explanation of this superiority. IMA and saphenous vein grafts have been systematically analysed with scanning electron microscopy (SEM) in a series of 11 patients undergoing coronary artery revascularization. At the time of implantation endothelial damage is almost absent in internal-mammary-artery (IMA) grafts; small areas of exposed subendothelial matrix may be present but are essentially non-thrombogenic as reflected by the lack of clots in these areas. In contrast the endothelium of harvested human saphenous veins (SV) shows large thrombogenic defects with exposed collagenous fibrils. The extent and deepness of the defects deteriorated in the period between removal of the vein and its attachment to the aorta. We conclude that long-term superiority of IMA grafts may also be due to the lack of primary intimal defects.
No takes yet. Share an insight, caveat, or question.
Lehmann et al. (1989) conducted an observational in Coronary artery revascularization (n=11). Internal mammary artery (IMA) grafts vs. Saphenous vein (SV) grafts was evaluated on Endothelial damage assessed by scanning electron microscopy. In 11 patients, internal mammary artery grafts exhibited almost no endothelial damage compared to saphenous vein grafts, which showed large thrombogenic defects with exposed collagenous fibrils.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: