orthostat'ic hypoten'sion

Med.a fall in blood pressure associated with an upright position, usually occurring as a result of standing still for a long time or rising from a prolonged stay in bed and often causing faintness, dizziness, and vision disturbances. Also called postural hypotension.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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