超音波ドプラ法(腎血流を中心として)

Abstract

We have mainly employed the ultrasonic Doppler technique serially after renal transplantation and renovascular operation as a hemodynamic monitoring. The equipment employed was directional Doppler flowmetry, Model EUD 2 and 4 types (Hitachi Medico Co.) The frequency med was 5 MHz, and that for the local oscillation was 5.0055 MHz. Using pulsed Doppler technique accompanied by B-mode ultrasonotomography, normal renal blood flow can be percutaneously registered. In the normal subjects, the blood flow pattern showed a rapid forward phase in systole and a slow forward phase in diastole. Renal transplantation recipients were percutaneously examined during a 4-year period starting the 8th day after renal transplantation. The flow components were analysed in reference to graft function, and it was found that acceleration time was correlated significantly to graft function. Graft prognosis during acute rejection crisis can be predicted according to changes of blood flow pattern in a systolic phase and/or a diastolic phase. In chronic rejection, exacervation of blood flow was gradually progressed with poor graft function. In a case with renovascular hypertension and arterio-venous fistula of the kidney, blood flow was measured preoperatively and postoperatively. Performance of surgical treatment can be assessed according to normalization of the blood flow. A percutaneous application of this technique seems to be safe and repeatable and to provide useful information about the circulatory dynamics of both the arterial and venous systems.