JAMES D. MEINDL 
1185 
we always get this negative profile. May I have 
the next slide? 
We also recorded velocity profile just in the 
side-to-side portocaval shunt in two different 
planes. Here is a graphic representation of the 
side-to-side portocaval shunt. Here the portal 
veins are anterior to the vena cava vein and 
here is the inferior vena cava. The probe is 
here. We can record a negative flow in this spot 
and a positive flow here. If we eliminated the 
paraventricular vein, we can see velocity pro- 
file positive from the portal vein and inferior 
vena cava. We could not complete the flow 
through the anastomosis in this situation be- 
cause of the two different flow patterns in 
different veins. May I have the next slide? 
We also tried to do some study on chronic 
dogs. If we had not too many problems with 
arteries, it appears possible to record good 
velocity profile on portal veins. Here is a 
velocity profile obtained during surgery. And 
here it is three weeks after surgery. So velocity 
is almost double as your lumen diameter is de- 
creased. May I have the last slide please? 
When we are doing anatomical studies, we 
can see that the probes have induced an enor- 
mous inflammatory response at the site of the 
probe. I thank you very much. 
