抄録
The most important factor during pulsatile cardiopulmonary bypass is to maintain arterial pressure simillar to physiolosical hemodynamic pattern. In order to obtain good pressure wave form, blood flow and pressure were examined by mock circulation unit. The hemodynamic monitors were checked on two different points, namely radial artery and femoral artery.
Pulsatile perfusion were done under high and low peripheral resistance.
Severe turbulent blood flow was noticed in the aortic root. This turbulence was caused by the strong jet flow from the tip of the aortic cannula. The blood pressure and flow increased selectively in radial artery when the direction of the jet pointed to the branch fo the aorta (carotid art.), while the femoral artery flow and perssure decreased markedly. On the contrary, the direction of the jet, pointed to the descending aorta, femoral artery pressure and flow increased selectively. The tendency to produce this pressure difference was more prominent when the peripheral resistance was lower.
Roller pump perfusion did not cause the pressure difference on the aortic branch because the jet flow was much weak under constant flow.
In order to get uniform arterial pressure in the aortic Franch during pulsatile perfusion, it is necessary to set two different arterial monitor and must keep aortic cannula tip in some optimum direction.
