orthostatic intolerance

orthostatic intolerance
an abnormal response to standing upright that results from decreased blood pressure and inadequate blood flow to the brain, characterized by a variety of symptoms including lightheadedness, palpitations, tremulousness, visual disturbances, and syncope. It occurs in both acute and chronic forms and is frequently seen as a transient condition in space travelers returning from microgravity. The etiology is unknown but may be related to abnormalities in the autonomic regulation of cardiovascular function.

Medical dictionary. 2011.

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