[MRI and ultrasonography of atherosclerosis of the thoracic aorta and carotid arteries in elderly hypercholesterolemic patients].

In 53 elderly participants aged more than 60 the thoracic aorta and bilateral carotid arteries were observed with noninvasive techniques, MRI and ultra-sonography, in order to elucidate the relationship between hypercholesterolemia and atherosclerosis in the elderly. Hypercholesterolemic subjects were classified as group H (serum total cholesterol (TC) greater than 220 mg/dl), group H-I (220 mg/dl less than TC less than 250 mg/dl) and group H-II (TC greater than or equal to 250 mg/dl). Atherosclerotic changes of the thoracic aorta were observed in 46% of group H, 27% of group H-I, 60% of group H-II and 37% of normolipidemic subjects (group NL). Carotid atherosclerotic changes were observed in 19% of group H, 9% of group H-I, 27% of group H-II and 18% of group NL. In group H-I, the percentages of atherosclerotic changes in both thoracic aorta and carotid arteries were lower than those in group NL. However, atherosclerotic changes of thoracic aorta and carotid arteries were detected in 43% and 29% of the subjects showing higher apo B/Apo Al ratio than 1.0 among group H-I + NL (TC less than 250 mg/dl). These changes occurred in 32% and 13% of the subjects showing lower apo B/Apo Al ratio than 1.0 among the same groups. Namely, atherosclerotic changes of the thoracic aorta and carotid arteries were observed more frequently in the subjects showing a higher apo B/Apo Al ratio than 1.0 even if their serum cholesterol values were not higher than 250 mg/dl. We should use not only the serum cholesterol value but also the apo B/Apo Al ratio as an indicator to evaluate the roles of lipids in the development of atherosclerosis.