It may be that abnormal blood flow in arteries, not veins, is involved in PD. Or, it may be that a combination of venous and arterial problems, or some venous irregularity that Zamboni did not look at, is involved in PD.Dr Noda???s position that Parkinson???s disease and other neurodegenerative diseases are caused by CTOS does support the vascular theory of PD. However, I have not found any other