Jugular diameter and venous reflux., Ann Ital Chir. 2016
"...CONCLUSION: By the analysis of the data, we may suppose that the females with both CCSVI and MS may present a wall Miopragia because there are significant differences in Valsalva+/ Valsalva- Ratio in females vs males subjects included in "JSd=10 mm" group (about 1:2 vs. 1:3).r Moreover jugular dilatations are equally present in left and right side and it can confirm the wall Miopragia hypothesis. The prevalence of V+ maneuver grows with the IJV diameter, therefore we presume that IJV dilatation is linked with the presence of jugular reflux. Further studies are required to consolidate our observations...."
http://www.ncbi.nlm.nih.gov/pubmed/27179227/