Arteriosclerotic histologic evaluation of the internal mammary artery in patients undergoing coronary artery bypass grafting.
During 1991, 52 patients undergoing myocardial revascularization had a biopsy of the distal internal left mammary artery (IMA) taken. There were 48 male and 4 female patients with a medium age of 58 years. Arteriosclerotic involvement of the IMA was assessed according to the scale of Kay. Using this index, grade 0 corresponds to a normal artery without atherosclerosis, grade 1 represents minimal disease, grade 2 a narrowing of less than 25% of the lumen, grade 3 narrowing between 25 and 50%, and grade 4 narrowing of 50% or greater of the lumen. Of the 52 IMA examined, the arteries with degree 0, 1, 2, 3, and 4 were: 19 (36.5%), 20 (38.4%), 9 (17.6%), 4 (7.6%) and zero. Thirty-three arteries (63.4%) had some degree of atherosclerosis. Considering the arteries with some atherosclerotic narrowing, 13 (25%) of the whole group had this pathological alteration. The IMA has a low but consistent incidence of arteriosclerosis involvement. Preoperative angiographic investigation of the IMA could be routinely performed.
Abad
C
C
Department of Cardio-Vascular Surgery, Hospital N.S. Pino, Las Palmas, Gran Canaria, Spain.
Santana
C
C
Diaz
J
J
Feijoo
J
J
D000328:Adult; D000368:Aged; D001161:Arteriosclerosis / Q000473:pathology*; D001706:Biopsy; D001026:Coronary Artery Bypass; D005260:Female; D006083:Graft Occlusion, Vascular / Q000473:pathology; D006801:Humans; D008297:Male; D008323:Mammary Arteries / Q000473:pathology* / Q000637:transplantation; D008875:Middle Aged; D009204:Myocardial Revascularization; D011446:Prospective Studies