There could be many factors involved in your case, dania, that may not have anything to do with CCSVI.
Perhaps, the blood thinning/anticoagulant and IV fluids which are administered during venoplasty helped mobilize blood throughout your body, or counter-acted hypovolemia. The anti coagulant you were on after your procedure would help this, as well. This would relieve edema in your lower limbs.
Or maybe, the opening of central venous stenosis affects the lower limbs.
The truth is, we do not know. Dr. Zamboni's study looked at the ramifications of central venous stenosis in the central nervous system. We need more placebo controlled clinical trials, so that the doctors can understand the mechanism of action. But we do know that CVI and CCSVI share many of the same outcomes, due to inflammation. That was Dr. Zamboni's first "Big Idea" that started his studies.The Big Idea: Iron-dependent inflammation in venous disease and proposed parallels in multiple sclerosishttp://jrsm.rsmjournals.com/content/99/11/589.full
One thing we do know, is that gravity has a different affect on CVI in the lower limbs, which is why patients are told to wear compression stockings, take vasoconstrictive medications and elevate their legs. The lower limbs need tighter veins to return blood to the heart.