Cerebral hemodynamic changes in head-up tilt test in patients with orthostatic hypotension, postural orthostatic tachycardia syndrome and other orthostatic intolerance

Abstract

Orthostatic hypotension (OH) and paroxysmal orthostatic tachycardia syndrome (POTS) are the common causes of orthostatic intolerance (OI). However the hemodynamic changes of cerebral blow in head-up tilt (HUT) test were not well known. The purpose of this study is to compare the cerebral hemodynamics in HUT test among patients with OH, POTS and other OI without OH and POTS (OOI). Two hundred and forty-three patients, who complained of orthostatic intolerance, were enrolled in this study. All patients performed the HUT test.