Tags: Disease.
Postural orthostatic tachycardia syndrome (POTS also postural tachycardia syndrome) is a condition of dysautonomia to be more specific orthostatic intolerance in which a change from the supine position to an upright position causes an abnormally large increase in heart rate called tachycardia. Several studies show a decrease in cerebral blood flow with systolic and diastolic cerebral blood flow (CBF) velocity decreased 44% and 60% respectively.