Postural orthostatic tachycardia syndrome (or POTS) is a condition of orthostatic intolerance in which a change from the supine position to an upright position causes an abnormally-high increase in heart rate, often, but not always accompanied by a sharp fall in blood pressure.
The syndrome was identified as such by Schondorf and Low in 1993. Similar symptoms were collectively described as "idiopathic hypovolemia" by Fouad in 1986.
Symptoms include a sudden increase in heart rate upon standing, often accompanied by hypotension, and associated with dizziness, fatigue, and nausea. About 80 percent of patients diagnosed with POTS are female and of menstruating age.
More on [ Postural orthostatic tachycardia syndrome ]
Hypotension :: Vascular Disorders

Postural Orthostatic Tachycardia Syndrome - A definition of POTS and its relation to Chronic Fatigue Syndrome and the pathophysiology.
Postural Orthostatic Tachycardia Syndrome - Patient's report on causes, symptoms, and treatment.
What is Orthostatic Intolerance? - An article about orthostatic tachycardia syndrome (POTS). What it is, the prognosis as well as all the names used to refer to this disorder.
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