Just finished a detailed reply and then lost !!!
Why should strokes cause PD symptoms like shuffling of gait??
Because if an event causes PD symptoms or exacerbates existing symptoms, it should, (according to the theory) widen the permeability of the Blood-Brain Barrier.
I gave a whole series of supporting references before, but here is a typical one

http://www.sciencedirect.com/science...69996108001927

The blood-brain barrier (BBB) is formed by the endothelial cells of cerebral microvessels, providing a dynamic interface between the peripheral circulation and the central nervous system. The tight junctions (TJs) between the endothelial cells serve to restrict blood-borne substances from entering the brain. Under ischemic stroke conditions decreased BBB TJ integrity results in increased paracellular permeability, directly contributing to cerebral vasogenic edema, hemorrhagic transformation, and increased mortality. This loss of TJ integrity occurs in a phasic manner, which is contingent on several interdependent mechanisms (ionic dysregulation, inflammation, oxidative and nitrosative stress, enzymatic activity, and angiogenesis). Understanding the inter-relation of these mechanisms is critical for the development of new therapies. This review focuses on those aspects of ischemic stroke impacting BBB TJ integrity and the principle regulatory pathways, respective to the phases of paracellular permeability

Ron