POTS puzzle: is it an autoimmune attack?

This study looks at whether people with POTS (a condition causing a rapid heart rate upon standing) have higher levels of certain immune proteins that might attack their own nervous system. Researchers will measure these proteins in blood samples from 58 participants, including both POTS patients and healthy volunteers, to see if they relate to symptoms and if levels stay stable over time. The goal is to better understand the cause of POTS, not to test a treatment.