谷口 信行¹, 高野 隆一³, 安田 是和², 王 怡¹, 中村 みちる¹, 川井 夫規子¹, 小野 倫子¹, 横田 京子¹, 尾本 きよか¹, 伊東 紘一¹

Nobuyuki TANIGUCHI¹, Ryuichi TAKANO³, Yoshikazu YASUDA², Yi WANG¹, Michiru NAKAMURA¹, Fukiko KAWAI¹, Michiko ONO¹, Kyoko YOKOTA¹, Kiyoka OMOTO¹, Kouichi ITOH¹

¹自治医科大学 臨床病理学, ²自治医科大学 腎臓内科, ³自治医科大学 救急医学

¹Department of Clinical Pathology, Jichi Medical School, ²Department of Nephrology, Jichi Medical School, ³Department of Emergency Medicine, Jichi Medical School

キーワード : Color Doppler ultrasonography, Blood flow, Portal vein, Velocity profile

We used the color Doppler method and velocity profiles obtained with it to estimate portal venous flow. Blood-flow profiles in the main portal vein and right anterior branch had flattened peaks, which the pulsed Doppler methods used so far have rendered as parabolic. To determine approximate profile shape, we used the parameter n in the formula Vr=Vmax [1 - (r/a)ⁿ], in which the letter a indicates radius; Vmax, maximum velocity; r, position in the vessel (0 ≤ r ≤ a); Vr, velocity at portion r; and n, profile parameter. Values of the profile parameter, n, ranged from 5 to 8; no value of 2, which would indicate parabolic shape, was produced. The color Doppler method showed spiral flow in the left branch of the portal vein; and the peak of the velocity profile in the umbilical portion was sometimes faster in the outer flow and sometimes faster toward the center of the flow, probably reflecting the angles between the left portal branch and the umbilical portion of the vein, the angles of left portal branch being sharper than those of the umbilical portion of the vein. These methods should prove useful in estimating portal venous flow.