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. - http://www.mc.vanderbilt.edu/gcrc/adc/oi.html
Postural Orthostatic Tachycardia Syndrome - A definition of POTS and its relation to Chronic Fatigue Syndrome and the pathophysiology. - http://www.nymc.edu/fhp/centers/syncope/POTS.htm