I have to wonder WHY muscles could not spasm and block the blood flow. I have very strong muscle spasms in my legs and arms. Couldn't the same happen in my blood vessels? Or... given my preoccupation with insulin which I know thickens and stiffens smooth muscles, could this be the mechanism at work?Theoretically a vein might constrict as its smooth muscle contracts but I doubt it can constrict in such a focused way and to the degree that it would impair flow.
prof8 wrote:That is quite interesting about the possibility of severe artifacting. What does the NIH use instead? Do they go with Doppler, CT scans (despite all the radiation) or just start right away with a venogram (radiation too)? I will certainly ask my doctor about this--I know he has done thousands of scans and procedures--what I don't know is how often his scans are MRV or MRA. In terms of a false positive I could see how that would be very possible especially if you are just looking at the sliced axial pictures starting from say the jawline and moving down. What you are seeing is the two white dots of the jugular veins and the two white dots of the carotid arteries on the sliced image of the skull. But my question would be how could a large extensive web of collateral veins from various side views be a false positive? My understanding was the axial pictures showing narrowing or flattening in combination with pictures of collateral veins would clinch the diagnosis. Without evidence of collateral veins I would be more skeptical of a CCSVI diagnosis, to be honest. What was surprising to Dr. X was my immense collateral system and then suddenly the stenosis was not there. He was just throwing ideas out there--one was maybe there is inflammation that leads to stenosis, in which case it's not congenital. Actually when I asked him about the international group of vascular surgeons headed by the Dr. at Georgetown who listed CCSVI as congenital--his response was "Well how do they REALLY know that?" I look forward to my 2 month follow up Doppler scan. In the meantime I can sit and wonder about my upper left jugular stenosis that needs a stent.
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