This study at Vanderbilt University looks at two medications, midodrine and droxidopa. These drugs help people with orthostatic hypotension, which means their blood pressure drops when they stand up. The study will see how these medicines affect veins in the abdomen for people with certain medical conditions like multiple system atrophy, pure autonomic failure, or Parkinson's disease.
The study has two parts: first, a screening, and then two testing days. During testing, participants will take either the medicine or a placebo (a pill that looks like medicine but isn't) and undergo tests including tilt table tests, which check how the body responds to standing up. These tests will measure things like blood pressure and heart rate.
- Study Length: About 5 days total.
- Visits Needed: Screening and two testing days.
- Participant Count: 34 people will be screened.
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