Orthostatic Hypotension »
What is orthostatic hypotension?
When a person stands up from sitting or lying down, the
body must work to adjust to that change in position. It is especially important
for the body to push blood upward and supply the brain with oxygen. If the body fails to do this
adequately, blood pressure falls, and a person may feel lightheaded or even pass
out. Orthostatic hypotension is the term used to describe the fall in blood
pressure when a person stands (orthostatic= upright posture of the body; hypo= less + tension=pressure).
Adequate blood supply to the body's organs depends upon
three factors:
- a heart strong enough to pump,
- arteries and veins that are able
to constrict or squeeze, and
- enough blood and fluid within the vessels.
When the
body changes position, a variety of actions occur involving all parts of the
cardiovascular
system as well as the autonomic nervous system that helps regulat...
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