[Idiopathic orthostatic hypotension (Shy-Drager syndrome). Results of regional cerebral blood flow measurements (author's transl)].

Using a gamma camera and the stochastic method, regional cerebral blood flow was measured in a patient with the diagnosis of idiopathic orthostatic hypotension. Blood pressure was altered by tilting the patient in supine position head-up and head-down. A partial defect in the autoregulation and CO2 sensitivity was found. Sensitivity to Norepinephrine was checked by intravenous infusion of 0.02 mug/min/kg body weight. An immediate marked rise in blood pressure was observed. Clinical symptoms, therapeutic guidelines, and histopathological findings are discussed.