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I don't think we know yet what all could contribute to accelerated symptoms but I agree that this could be one of them!
Some thoughts:
There are different degrees of congenital CCSVI. Both jugulars could be fully closed. Both could be partially closed. One could be wide open, but the azygous is partially closed. This could contribute to the timing of onset or type of MS.
Renal vein syndrome is a factor in some patients. Renal vein phenomenon, which is when the renal vein is compressed but no apparent symptoms, is most likely to be seen in the young and thin. (This was in some material I previously linked on renal vein syndrome.) So it might be that renal vein syndrome doesn't really kick in until we get older and, alas, heavier. This could contribute to the worsening of CCSVI and timing of onset, etc, in those patients with renal vein compression.
Immune system is undeniably involved. The neurologists' past few decades of research is not without merit in that regard, even if they never caught on to the vascular involvement. Those with a genetic tendency to have their immune systems freak out, if you will, can then expect their immune systems to freak out when called upon to deal with the damage being incurred in a CCSVI-affected CNS environment, as well as increased access due to damaged blood-brain barrier.
Different people will have different degrees of ability to create collaterals, and the strength of those collaterals. Blockages from an early age might actually result in better collaterals, as the body can take advantage of the childhood years of growth to build them. Exercise and vitamin D and sunshine might contribute to better collaterals, better blood-brain barrier, better jugulars.
Some people will have hypoplastic ascending lumbar veins. Untreatable, possibly associated with progressive MS.
Men have more elastic jugulars than women, thus potentially leading to more 'storage capacity' as the blood flow attempts to get past the blockage, and less reflux into the brain where the worst damage is done.
In a healthy person, our venous system is equipped to deal with damage or loss to a vessel. Other veins take over the flow, seemingly without consequence, although that seems to be something that has been taken for granted and not well-researched for long-term consequences. But, in a person with CCSVI, there is nothing to spare, so if additional damage occurs, our situation is worsened. We've yet to know what could be additional damage or cause additional narrowing in a person with already-existing CCSVI. Jaw misalignment, atlas misalignment, trauma to the neck, trauma to the renal vein, abdominal weight gain that compresses any of the relevant veins, weight gain in the neck, chemo, radiation, dialysis, incidental damage from venoplasty, damage due to clotting, jugular thrombosis due to ovarian hyperstimulation syndrome (something to discuss if you're considering infertility treatment, probably rare), loss of elasticity in the jugulars, and aging could all be factors that worsen our condition, and there could be factors that I've missed.
So, in short, I'd say the equation could be: Congenital CCSVI + [many possible factors, one of which could be neck trauma] = possibility of accelerated symptoms
More unknowns and 'possibles' in my equation! Makes me want to see Dr. Tucker's actual equations! Hope physics is as easy to learn with no background as interventional radiology of one specific condition has been! Although the credit goes to the teacher (Dr. Sclafani) for the latter seeming easy.
I just like that anyone reads the articles I dig up! A lot of times they're not directly related to CCSVI, because there's not enough research on CCSVI, but there is research on jugulars in other conditions, and you never know how it will all contribute to a global knowledge of the jugular. If we are due for a snowballing of CCSVI research in this next year, I cannot wait.
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