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NORD is very grateful to Phillip A. Low MD, Robert D. and Patricia E. Kern Professor of Neurology, Mayo Clinic College of Medicine, for assistance in the preparation of this report.
Synonyms of Orthostatic Hypotension
- Postural Hypotension
- Neurogenic Orthostatic Hypotension (NOH)
Orthostatic hypotension (OH) is a common condition characterized as a drop in blood pressure that occurs when a person stands up. OH can cause lightheadedness, dizziness or even causing a person to faint. Symptoms can also be subtle or absent. By definition, the drop in blood pressure must be greater than 20mm Hg of mercury in systolic BP and/or more than 10 mm of mercury in diastolic BP within 3 minutes upon standing from sitting or from a lying down face-up (supine) position. There are numerous, varied causes of OH. Neurogenic orthostatic hypotension (NOH) is a rare subtype caused by underlying neurologic disorders that affect a specific part of the autonomic nervous system. The autonomic nervous system is the part of the nervous system that regulates certain involuntary body functions such as heart rate, blood pressure, sweating, and bowel and bladder control. The treatment of OH depends upon several factors including the specific underlying cause.
Orthostatic Hypotension Resources
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