Document Detail


Active regulation of cerebral venous tone: simultaneous arterial and venous transcranial Doppler sonography during a Valsalva manoeuvre.
MedLine Citation:
PMID:  20213466     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of this study was to analyse the cerebral venous outflow in relation to the arterial inflow during a Valsalva manoeuvre (VM). In 19 healthy volunteers (mean age 24.1 +/- 2.6 years), the middle cerebral artery (MCA) and the straight sinus (SRS) were insonated by transcranial Doppler sonography. Simultaneously the arterial blood pressure was recorded using a photoplethysmographic method. Two VM of 10 s length were performed per participant. Tracings of the variables were then transformed to equidistantly re-sampled data. Phases of the VM were analysed regarding the increase of the flow velocities and the latency to the peak. The typical four phases of the VM were also found in the SRS signal. The relative flow velocity (FV) increase was significantly higher in the SRS than in the MCA for all phases, particularly that of phase IV (p < 0.01). Comparison of the time latency of the VM phases of the MCA and SRS only showed a significant difference for phase I (p < 0.01). In particular, there was no significant difference for phase IV (15.8 +/- 0.29 vs. 16.0 +/- 0.28 s). Alterations in venous outflow in phase I are best explained by a cross-sectional change of the lumen of the SRS, while phases II and III are compatible with a Starling resistor. However, the significantly lager venous than the arterial overshoot in phase IV may be explained by the active regulation of the venous tone.
Authors:
Erwin Stolz; Damian A W Rüsges; Oskar Hoffmann; Tibo Gerriets; Max Nedelmann; Piergiogio Lochner; Manfred Kaps
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Publication Detail:
Type:  Journal Article     Date:  2010-03-07
Journal Detail:
Title:  European journal of applied physiology     Volume:  109     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-14     Completed Date:  2010-09-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  691-7     Citation Subset:  IM    
Affiliation:
Department of Neurology, Justus-Liebig University, Am Steg 14, 35385 Giessen, Germany. erwin.stolz@neuro.med.uni-giessen.de
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Flow Velocity
Blood Pressure
Cerebral Veins / physiology,  ultrasonography*
Cerebrovascular Circulation*
Female
Humans
Male
Middle Cerebral Artery / physiology,  ultrasonography*
Photoplethysmography
Reaction Time
Time Factors
Ultrasonography, Doppler, Transcranial*
Valsalva Maneuver*
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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