In autonomic failure (AF), blood pressure (BP) falls upon standing which is commonly ascribed to defective vasoconstriction and excessive pooling. Observations on the amount of pooling in AF are contradictory.
Department of Neurology and Clinical Neurophysiology, Leiden University Medical Centre, Postal Zone J3-R, PO Box 9600, 2300 RC, Leiden, The Netherlands. r.d.thijs@lumc.nl