Orthostatic tolerance, cerebral oxygenation, and blood velocity in humans with sympathetic failure

Background and Purpose - Patients with orthostatic hypotension due to sympathetic failure become symptomatic when standing, although their capability to maintain cerebral blood flow is reported to be preserved. We tested the hypothesis that in …

Cerebral oxygenation declines in healthy elderly subjects in response to assuming the upright position

Background and Purpose - With increasing age, assuming the upright position is more often accompanied by symptoms such as dizziness and lightheadedness, possibly as a result of a diminished oxygen supply to the brain due to impaired cerebral …