NHE wrote:NZer1 wrote:Thought no 3,
The talk about hydrocephalus is very compelling and something I believe has been mentioned by another Dr. on TiMS' some time ago.
If the blood cannot 'leave' the skull naturally, there will be signs of pressure build ups in the skull itself?
It seems that the backup of blood is occurring prior to the jugulars?
This is not intended to be a complete answer to your question, but simply a sharing of my limited understanding of the system under discussion. I leave it to Dr. Sclafani to provide a more detailed answer. Blood flow to the brain from the heart is not through a single direct artery, but through a system with many branches. If we use a simplified plumbing analogy, it is like having a pipe with a Y adapter. Suppose one branch of the Y has reduced outflow due to a restriction, the branch without the restriction will have the greater flow due to the fluid traveling the path of lower resistance. In addition, I recall that there were measurements of pressure gradients reported across stenoses. These may have been done during Dr. Dake's early work. The pressure gradients, although present, were not terribly large. I suspect that the explanation for that observation is due to a flow description like the one above.
NHE
I remember Dr. S using this analogy early on in time and I have aways thought that we forget how the brain is series of passages rather then a tank.
This to me means the the flow around the brain passages is dependent on the available exit flow.
Some passages will regularly flush and others will be stagnant in effect.
So in my thinking the flow concept is lost within the brain.
Slow flow and wall disease would surely go hand in hand.
Some where I think Dr. Zamboni showed photos of the vein walls at the stricture sites, I would like to see if the vein walls at lesion sites within the brain give indication of what is happening.
I think also from memory this is where Dr. Shelling has done some amazing discovering that was overlooked by main stream medicine back in the 80's.
The flow speed around the brain passages, health of the walls and the position of lesions forming does appear to co-inside, from my fading memory.
Hopefully some more inquiring minds can give support to the past findings.
Thanks Dr. S for your answers above as well
Regards Nigel