Document Detail


Conception of the venous hemodynamics in the lower extremity.
MedLine Citation:
PMID:  17067977     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Contradictory reports on the significance of several hemodynamic phenomena, such as femoral vein incompetence and incompetent calf perforators, impede orientation in venous hemodynamics. Venous pressure difference arising between the popliteal and the posterior tibial vein during the activity of the calf muscle venous pump was reported for the first time about 50 years ago, but regrettably, this important discovery continues to be unrespected. The venous pressure difference has since been termed ambulatory pressure gradient and seems to be the key factor triggering the venous reflux in the lower limb as well as the process leading to varicose vein recurrence. On the other hand, simultaneous recordings of the mean venous pressure in the posterior tibial and long saphenous veins demonstrated that the pressure curves have been identical at rest, during ambulation, and in the recovery period, a finding typical of conjoined vessels. Bidirectional flow within calf perforators taking place both in healthy subjects and in patients with varicose veins enables a quick equilibration of pressure changes between deep and superficial veins of the lower leg. Reflux disturbing the venous hemodynamics is in various degrees dependent on the quantity of retrograde flow; abolition of reflux restores normal venous hemodynamics. Reflux in superficial veins, if large enough, may cause the most severe form of chronic venous insufficiency. Femoral vein incompetence and incompetent calf perforators per se do not produce ambulatory venous hypertension and do not cause hemodynamic disturbance. This study discusses the controversial issues, tries to define and appraise the principal hemodynamic phenomena (ambulatory venous hypertension, ambulatory pressure gradient, venous reflux, superficial and deep vein incompetence, incompetent perforators), mentions a possible relation between deep vein incompetence and varicose veins, and attempts to present, based on proved facts, a comprehensive picture of the venous hemodynamics in the lower extremity.
Authors:
C Recek
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Angiology     Volume:  57     ISSN:  0003-3197     ISO Abbreviation:  Angiology     Publication Date:    2006 Oct-Nov
Date Detail:
Created Date:  2006-10-27     Completed Date:  2006-11-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0203706     Medline TA:  Angiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  556-63     Citation Subset:  IM    
Affiliation:
Vienna, Austria. recek@aon.at
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MeSH Terms
Descriptor/Qualifier:
Humans
Leg / blood supply*
Muscle, Skeletal / blood supply,  physiopathology
Varicose Veins / physiopathology*
Veins / physiopathology*
Venous Insufficiency / physiopathology*
Venous Pressure*

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