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Air plethysmography (APG) was used to measuremaximal venous outflow rate (MVO), a
test for proximal venous obstruction; venous volume; venous filling index, an estimate
of valvular incompetence; ejection fraction (EF), a test of calf-muscle pump efficiency;
and residual volume fraction (RVF), an estimate of ambulatory venous pressure.
MVO was lower in patients with chronic venousinsufficiency (CVI) than in those with
varicose veins (VV), but the difference was small (p=0.06). RVF was significantly
greater in extremities with CVI when compared with those with VV (p <0.01). However,
the degree of abnormality in venous volume, venous filling index, and EF was similar
in CVI and VV extremities.
In summary, although RVF tends to be higher in extremities with CVI when compared
with those with VV, there is tremendous overlap between VV and CVI for each of the
hemodynamic variables measured by APC. Therefore, the pathophysiology of CVI is likely
to involve not only hemodynamic abnormalities but also other factors that have not
yet been clearly identified.
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Article info
Footnotes
**Presented at the 20th Annual Meeting of the Society for ClinicalVascular Surgery, Orlando, Florida, March 25–29, 1992.
Identification
Copyright
© 1992 Reed Publishing USA. Published by Elsevier Inc.
