Blood velocity profiles in the human renal artery by Doppler ultrasound and their relationship to atherosclerosis
Blood velocity profiles in the human renal artery by Doppler ultrasound and their relationship to atherosclerosis
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DOI：
10.1161/01.atv.16.1.172
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发表时间：
1996-01-01
影响因子：
8.7
通讯作者：
Kajiya, F
中科院分区：
文献类型：
--
作者：
Yamamoto, T;Ogasawara, Y;Kajiya, F
Blood velocity profiles were measured in the renal branch (diameter 5.9 +/- 1.3 mm) of the aortorenal bifurcation using a 20-MHz 80-channel pulsed Doppler velocimeter during retroperitoneal surgery in 10 patients. The peak Reynolds number was 1145 +/- 140 and the frequency parameter (Wormersley parameter) was 3.0 +/- 0.8. immediately distal to the ostium of the renal artery, reverse Bow, indicating flow separation, was observed near the cranial wall mainly during the first part of the cardiac cycle. There were flows from the cranial to the caudal side of the artery at this location, indicating the presence of strong secondary flows. Two diameters down stream of the ostium, the velocity profiles were skewed to the caudal side in all patients. Four diameters downstream, the flow profile was symmetrical (3 patients) or only slightly skewed (7 patients) and virtually parabolic throughout the cardiac cycle. These observations mean that the flow on the cranial side df the renal branch of the human aortorenal bifurcation is characterized by (1) a bidirectional oscillation of the Bow, (2) separation of the Bow during systole, and (3) low time-averaged shear rate. These blood velocity patterns may be related to the localization and development of atheromatous plaque that occurs preferentially in this region of the renal artery. Conversely, the unidirectional, axisymmetrical how found in more distal parts of the renal artery are associated with a very low incidence of lesions.
