Ultrasound vasography evaluation of radial arterial grafts used for coronary arterial bypass surgery.
OBJECTIVE
For coronary bypass surgery, radial arteries are often used as bypass grafts. Some of these arteries however, have arteriosclerotic lesions. We attempted to evaluate the relationship between arteriosclerosis and vasodilation.


METHODS
Prior to bypass surgery, 20 patients underwent ultrasound vasography to determine the condition of their radial and brachial arteries. Flow-mediated dilation, which is the same as endothelium-dependent vasodilation, was measured in the brachial artery of the nondominant arm by reactive hyperemia after 5-minute forearm ischemia. Vasodilation after application of a sublingual glyceryl trinitrate spray was also measured.


RESULTS
During surgery, 4 of 20 radial arteries demonstrated calcification, and 3 of the 4 could be used by removing the calcified part. However, the other artery, which had extensive calcification that could not be detected by ultrasound vasography, was discarded. The amount of vasodilation seen after the administration of sublingual glyceryl trinitrate had no correlation with calcified grafts. Calcified radial arteries demonstrated significantly poor brachial artery vasodilation by an endothelial-dependent vasodilation test.


CONCLUSIONS
Calcification in radial arteries can thus only be evaluated by flow-mediated dilation.
Ueyama
K
K
Department of Thoracic Surgery, Maizuru Mutual Hospital, 1035 Hama, Maizuru, Kyoto 625-8585, Japan.
Kaku
B
B
Ohashi
H
H
Tsutsumi
Y
Y
Kawai
T
T
Ueda
T
T
Ohnaka
M
M
D000368:Aged; D000369:Aged, 80 and over; D001161:Arteriosclerosis / Q000000981:diagnostic imaging*; D001026:Coronary Artery Bypass / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017534:Radial Artery / Q000000981:diagnostic imaging* / Q000502:physiology / Q000637:transplantation*; D012039:Regional Blood Flow; D014463:Ultrasonography; D014664:Vasodilation