1eye wrote:I was going to ask you: why do you not think reflux is a problem, and how do you think it is caused? I would think it is the source of instantaneous positive jugular pressure, which could overcome gravity enough to result in instantaneous back-flow strong enough to damage the BBB and cause all manner of trouble. If you look at the inflated brain-draining-vein pictures taken by Prof. Haacke, it looks like the veins have been inflated. Maybe the stenoses in the jugular are just strong spots in the vein walls, that didn't inflate?
let me clarify. I do think reflux is a problem. It is caused by having outflow obstructions that require that the blood travel back to the heart through different routes than it should.
It is not really a matter of pressure because the pressure isnt high at all to begin with and increases in pressure are very small.
your description of having "strong spots" in the vein walls is nice if you mean that they are areas of the vein wall that cannot distend because they are stiff. Most often, those spots are near the valves.
good job, i might have said it differently, but i think you understand the spots