| Different cerebral hemodynamic responses between sexes and various vessels in orthostatic stress tests. | |
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MedLine Citation:
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PMID: 20733185 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The argument about why the head-up tilt table test (HUT) does not include the posterior cerebral circulation, which is mainly responsible for syncope, as a monitor target has not been resolved. It is also unclear whether there is a sex difference in cerebral blood flow (CBF) changes. We hypothesized that orthostatic CBF changes more in the posterior circulation than in the anterior circulation and is different between sexes. METHODS: Thirty healthy volunteers (13 female and 17 male) were recruited for the HUT. The blood pressure (BP), middle cerebral artery flow velocity (MCAFV), and posterior cerebral artery flow velocity (PCAFV) were monitored simultaneously. Static cerebral autoregulation (CA) was calculated. RESULTS: The female volunteers had a lower BP, but there was no difference in orthostatic BP changes (female versus male: 1.29% +/- 5.26% versus 4.22% +/- 12.65%; P = .65). The female volunteers had a significantly greater orthostatic drop in the PCAFV than in the MCAFV (23.8% +/- 9.1% versus 18.2% +/- 7.3%; P = .008). The static CA in the middle cerebral artery was better than in the posterior cerebral artery, although not significantly (13.6% +/- 34.8% versus - 2.8% +/- 12.2%; P = .15). CONCLUSIONS: Our study showed the different cerebral hemodynamic responses between anterior and posterior circulations and between sexes during the HUT. We conclude that HUT studies for syncope should include the posterior cerebral circulation, especially for female patients. |
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Authors:
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Yuh-Jen Wang; A-Ching Chao; Chih-Ping Chung; Ying-Ju Huang; Han-Hwa Hu |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine Volume: 29 ISSN: 1550-9613 ISO Abbreviation: J Ultrasound Med Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-24 Completed Date: 2011-01-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8211547 Medline TA: J Ultrasound Med Country: United States |
Other Details:
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Languages: eng Pagination: 1299-304 Citation Subset: IM |
Affiliation:
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Department of Neurology and Internal Medicine, Taipei City Hospital, Taipei, Taiwan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cerebrovascular Circulation
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physiology* Female Hemodynamics / physiology* Humans Male Reference Values Sex Factors Statistics, Nonparametric Syncope / physiopathology Tilt-Table Test* Ultrasonography, Doppler, Transcranial* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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