To understand neurogenic orthostatic hypotension (nOH), you first have to understand that nOH is a condition that falls under a larger category called orthostatic hypotension (OH), also known as postural hypotension.
OH is a sustained drop in systolic blood pressure of at least 20 mmHg or diastolic blood pressure of at least 10 mmHg that happens within 3 minutes of standing. Certain medications, dehydration, and conditions such as heart disease can lead to OH. Plus, OH tends to happen more often as people get older.
Causes of Orthostatic Hypotension
Heart failure, problems with blood flow, and a decreased volume of blood in your body are some of the potential causes of OH.
Certain medications, such as ones prescribed for high blood pressure, depression, or to treat conditions like Parkinson’s disease, have been found to cause OH.
Parkinson’s disease, multiple system atrophy, pure autonomic failure, or other types of autonomic dysfunction can cause OH.
An Issue With Your Nervous System
If you have nOH, it means that the type of orthostatic hypotension that you have is autonomic nervous system-related. Specifically, the body does not release enough norepinephrine. Watch this video to see how nOH impacts your body, causing you to feel faint when you stand or sit up.