eMedicine.com: Orthostatic Intolerance
Article addresses issues with orthostatic intolerance or problems standing upright. Defines acute orthostatic intolerance, neurally mediated syncope (NMS), and chronic orthostatic intolerance.
MayoClinic: Orthostatic Hypotension
Comprehensive overview including symptoms, causes, treatment, and risk factors of this form of low blood pressure, also known as postural hypotension.
NINDS: Orthostatic Hypotension Information Page
Defines orthostatic hypotension also known as postural hypotension. From the National Institute of Neurological Disorders and Stroke (NINDS).
Provides an overview of the causes, diagnosis, and laboratory tests for orthostatic hypotension. Also examines the case study of a 57 year old man exhibiting orthostatic hypotension symptoms and possible treatment recommendations.
Orthostatic Intolerance (OI)
Article examines the connection between orthostatic intolerance (OI) and chronic fatigue and immune dysfunction syndrome (CFIDS) with a particular focus on neurally mediated hypotension (NMH) and orthostatic tachycardia syndrome (POTS).
Orthostatic Intolerance Syndromes
Gives an overview of conditions associated with orthostatic intolerance (OI), an autonomic disorder. Also provides information on syptoms, management, and prognosis. From the National Dysautonomia Research Foundation.
Wikipedia: Orthostatic Hypotension
User-edited article about a type of hypotension or sudden fall in blood pressure when a person assumes a standing position, usually after a prolonged period of rest. Orthostatic hypotension is also known as postural hypotension.