Why is NASA interested in studying venous flow with Dr. Zamboni? Because their astronauts are experiencing vision and neurological problems after returning from months on the space station. Here's some more info on the ISS Drain Brain program and the MS connection.
"Some of the neurological issues being reported by astronauts living in microgravity include loss of vision, fatigue and headaches, possibly due to increased intracranial pressure. One in five astronauts report changes in vision after returning to earth, and many problems involve the optic nerve, also an area of change in multiple sclerosis, which could be related to disturbed venous flow. After five to six months in zero gravity, 20% of the astronauts are noting vision problems."

From Rindfliesch's discovery of the central vessel in the MS lesion in 1863, to Dr. Paolo Zamboni's discovery of Chronic Cerebrospinal Venous Insufficiency. 150 years of MS research on blood flow and perfusion of the central nervous system. Because the heart and the brain are connected.