It,s not a definite but a possibility because i am not responding to drug treatment and the progression is relatively quick. Other indicators are speech, breathing, posture.

Parkinson's disease is a longer period of life and you respond well to medication for quite a very long time. While with MSA the medication is short lived and symptoms progress more rapidly.

I haven't been responding either to the medication. I started out low dose a year ago and now on 50/200 extended release 6x daily. Not as much as some but I think it is a lot.

From what I was told, OH(orthostatic hypotension) is the hallmark sign of MSA. That then is divided into two groups. A test called the tilt table test is done to check for dysautonomia.