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Cortical blood flow during head-up postural change in subjects with orthostatic hypotension.
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1993 (English)In: Clinical Autonomic Research, ISSN 0959-9851, E-ISSN 1619-1560, Vol. 3, no 5, 311-8 p.Article in journal (Refereed) Published
Abstract [en]

Regional cerebral blood flow was measured with the 133-Xenon inhalation method in seven healthy subjects with orthostatic hypotension not due to autonomic failure (i.e. non-neurogenic clinical disorder). Measurements were performed during supine rest and during head-up tilt (70 degrees). All subjects had a consistent drop in systolic blood pressure and the typical symptomatology of orthostatic hypotension. The results showed lower mean hemispheric blood flow during head-up tilt than during supine rest. In addition, a consistent and significant redistribution of the regional flow values was seen, with a reduction in frontal and an increase in postcentral areas. The frontal flow decrease during tilt was more marked than in subjects without orthostatic hypotension and was not related to variations in the level of PCO2 or to respiration. In contrast to the clinical symptoms of orthostatic hypotension (dizziness, nausea, visual disturbances, and in some cases syncope), the cortical blood flow reduction was, however, relatively moderate.

Place, publisher, year, edition, pages
1993. Vol. 3, no 5, 311-8 p.
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URN: urn:nbn:se:lnu:diva-17578PubMedID: 8124063OAI: oai:DiVA.org:lnu-17578DiVA: diva2:503267
Available from: 2012-02-15 Created: 2012-02-14 Last updated: 2012-12-20Bibliographically approved

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