Preliminary examination of peripheral resistance in Kidney by using a high-speed CCD

Pulsatility in aortic flow can be obtained with native ventricles even if the assist devices are rotary blood flow types. Therefore, it is anticipated that the pulsatile flow with centrifugal blood pumps might cause changes in peripheral perfusions. We have been establishing a new method of measuring peripheral perfusions by using a high speed CCD camera in order to diagnose blood flow in peripheral organs. In this study, we performed an animal experiment using a goat and examined renal circulation under the administration of vasodilator with two different types of blood flow measurements; a laser Doppler tissue flow and the CCD. We also compared the peripheral impedance in each method as well as the renal input impedance calculated by the aortic pressure and electromagnetic flow waveforms. As a result, the longitudinal and characteristic impedance data decreased under the vasodilation condition in each renal peripheral perfusion analysis.