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Low-grade intimal hyperplasia in internal mammary and right gastroepiploic arteries as bypass grafts
J A van Son1, V Falk, T Walther
1Herzzentrum, University of Leipzig, Germany.
Insights
Histologic examination of coronary artery bypass grafts revealed that both internal mammary arteries and right gastroepiploic arteries remain patent long-term. The right gastroepiploic artery showed a thicker intima than the internal mammary artery, while the saphenous vein graft exhibited atherosclerosis.
Area of Science:
- Cardiovascular Surgery
- Vascular Biology
- Histopathology
Background:
- Limited knowledge exists on the histology of internal mammary arteries (IMA) and right gastroepiploic arteries (RGEA) used as coronary artery bypass grafts (CABG).
- Understanding graft histology is crucial for assessing long-term patency and function in CABG procedures.
Purpose of the Study:
- To histologically evaluate the internal mammary arteries and right gastroepiploic arteries functioning as CABG conduits.
- To compare the histological characteristics of IMA and RGEA with saphenous vein grafts (SVG) after CABG.
Main Methods:
- Harvesting and histological examination of three RGEAs, four IMAs, and one SVG from three male patients deceased 19-47 months post-coronary revascularization.
- Measurement of intimal thickness in proximal, middle, and distal segments of each graft type.
Main Results:
- All examined grafts (IMA, RGEA, SVG) were patent at the time of patient death.
- Mean intimal thickness varied across segments: IMA (41.0, 31.8, 25.8 microns) and RGEA (58.0, 40.3, 34.3 microns).
- The saphenous vein graft displayed severe focal atherosclerosis, unlike the arterial grafts.
Conclusions:
- Histological findings support the excellent medium- to long-term patency rates reported for IMA and RGEA when used as CABG conduits.
- The RGEA demonstrates favorable histological characteristics for coronary artery bypass grafting.
- Arterial grafts (IMA, RGEA) appear more resistant to atherosclerosis compared to saphenous vein grafts in this cohort.
Background:
Knowledge is limited regarding the histology of the internal and right gastroepiploic arteries that have been functioning as coronary artery bypass conduits.
Methods:
Four internal mammary arteries, 3 right gastroepiploic arteries, and 1 saphenous vein graft that had been functioning as coronary artery bypass grafts were harvested and examined histologically in 3 male patients who had died at 19, 38, and 47 months after coronary revascularization.
Results:
All grafts were patent. The mean thicknesses of the intima in the proximal, middle, and distal segments were 41.0, 31.8, and 25.8 microns for the internal mammary artery and 58.0, 40.3, and 34.3 microns for the right gastroepiploic artery. The saphenous vein graft showed severe focal atherosclerosis.
Conclusions:
This histologic study in a small number of patients corroborates the reported excellent patency rates at medium- to long-term follow-up of the internal mammary and right gastroepiploic arteries used as coronary artery bypass grafts.