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.htmWhat 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
Patient's report on causes, symptoms, and treatment.
http://home.att.net/~potsweb/POTS.html
