Document Detail


Forearm vascular responsiveness to prolonged venous occlusion in normal subjects.
MedLine Citation:
PMID:  8004853     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Fourteen normal subjects (18-42 y) were studied using venous occlusion plethysmography to investigate the characteristics and reproducibility of the forearm vasoconstrictor response following a prolonged venous occlusion stimulus. Upon release of the stimulus, a transient vasodilation is followed by a vasoconstriction. As the stimulus of venous occlusion pressure increased (40, 60, 80, and 100 mmHg for 5 min), there was a significant increase in maximum flow (p = 0.01). Minimum relative flow (minimum divided by control) was unchanged except at the highest occlusion pressure (0.49 +/- 0.05, 0.38 +/- 0.04, 0.47 +/- 0.07, 0.66 +/- 0.12, p = 0.04). As venous occlusion duration increased (3, 4, 5, and 6 min at 80 mmHg), there was no significant change in minimum relative flow (p = 0.73). With increasing ambient temperature (18, 23, and 28 degrees C), there were no significant changes in maximum or minimum relative flows (p = 0.40 and 0.25, respectively). Minimum relative flow was not significantly altered following occlusion with a 2.5-cm cuff vs. a 10-cm cuff (p = 0.77). Thus, the vasoconstriction response was reproducible over a range of venous occlusion stimuli and experimental conditions. We conclude that dynamic vascular responsiveness to prolonged venous occlusion can be measured by venous plethysmography and that calculation of the minimum flow relative to control flow is an appropriate and reproducible index of the vasoconstrictor response. Based on our studies and to conveniently measure these changes, we recommend a 10-cm venous occlusion cuff, with a pressure < or = 80 mmHg, for durations < or = 5 min, in an ambient temperature of 23 degrees C.
Authors:
G E Marchiori; R Briggs; J M Arnold
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical and investigative medicine. Médecine clinique et experimentale     Volume:  17     ISSN:  0147-958X     ISO Abbreviation:  Clin Invest Med     Publication Date:  1994 Apr 
Date Detail:
Created Date:  1994-07-21     Completed Date:  1994-07-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7804071     Medline TA:  Clin Invest Med     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  77-87     Citation Subset:  IM    
Affiliation:
Department of Medicine, Victoria Hospital, London, Ontario.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Blood Flow Velocity
Forearm / blood supply*
Hot Temperature
Humans
Male
Plethysmography
Pressure
Vasomotor System / physiology*
Veins
Venous Pressure

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


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