There are multiple terms used for the same disorders which can be confusing. Parkinson Plus is also known as Multiple System Atrophy (MSA) and MSA is also known as Shy-Drager syndrome. Quoting from a paper by Dr. David Robertson, "The Shy-Drager syndrome is a disorder characterized by autonomic dysfunction, together with symptoms resembling Parkinson's disease." I hope this helps. Please feel free to contact me if you would like more information. Sylvia Dickinson, R.N., M.S.N. Autonomic Dysfunction Center ([log in to unmask])