This is a very short youtube video...Very easy to watch. Dr. Fischer at the Mayo Clinic explains POTS and his experiences with patients using Midodrine vs. Beta Blockers. http://www.youtube.com/watch?v=iJ9bv7jx-Ls This is also a good video to share with people to explain POTS in a way that will get their attention. He speaks simply, but at one point says, "POTS is real." I'm taking a Beta Blocker prescribed by Dr. Klimas for POTs, she uses Attenol.