手塚 清恵¹, 星 伴路¹, 角谷 英治², 北小路 博司², 矢田 康文¹, 本郷 文弥⁴, 渡辺 泱³, 斉藤 雅人¹

Kiyoe TETSUKA¹, Tomoji HOSHI¹, Eiji SUMIYA², Hiroshi KITAKOJI², Yasufumi YADA¹, Fumiya HONGO⁴, Hiroki WATANABE³, Masahito SAITOH¹

¹明治鍼灸大学泌尿器科学教室, ²明治鍼灸大学臨床鍼灸医学教室, ³明治鍼灸大学大学院基礎医学教室, ⁴京都府立医科大学泌尿器科学教室

¹Department of Urology, Meiji University of Oriental Medicine, ²Department of Oriental Medicine, Meiji University of Oriental Medicine, ³Department of Clinical Acupuncture and Moxibustion Meiji University of Oriental Medicine, ⁴Department of Urology, Kyoto Prefectural University of Medicine

キーワード : color flow imaging, renal blood flow, resistive index, ultrasound

Objects: We studied the relationship between age and renal blood flow parameters to determine the clinical significance of using Doppler color flow imaging (CFI) in their measurement. Subjects and Methods: One hundred forty-four healthy subjects with no renal or circulatory diseases took part in this study. All subjects were placed in the prone position and examined with CFI. The kidney was visualized in a longitudinal view, and blood flow in the interlobar arteries was studied. Peak systolic flow velocity (Vmax), end-diastolic flow velocity (Vmin), and resistive index (RI) were used as blood flow parameters. Results: Age and Vmax were not significantly associated (p=0.03) in the interlobar artery. Vmin decreased significantly (pDiscussion: Ishimura et al have reported that RI was significantly correlated with age in diabetic patients. Here the same result was obtained in healthy subjects. The incidence of arteriosclerosis is known to increase with age. In general, RI is influenced by vascular resistance. Increase in RI with age in this study was explained by the effect of arteriosclerosis on age-related vascular resistance. These results suggest that age should be considered in the study of blood flow in the kidney.