The most common patterns of cerebral response to OH are autoregulatory failure with a flat flow-pressure relationship or intact autoregulation with an expanded autoregulated range. The least common pattern is autoregulatory failure with a steep flow-pressure relationship. Patients with patterns 1 and 2 have an enhanced capacity to cope with OH, while those with pattern 3 have reduced capacity.
Stroke. 1998 Jan;29(1):104-11. Links
Autoregulation of cerebral blood flow in orthostatic hypotension.
Novak V, Novak P, Spies JM, Low PA.
Autonomic Disorders Center, Department of Neurology, Mayo Clinic and Foundation, Rochester, Minn. 55905, USA.