Inadequacy of saphenous vein grafts for cross-femoral venous bypass

Stephen G. Lalka, Julia M. Lash, Joseph L. Unthank, Valerie K. Lalka, Dolores F. Cikrit, Alan Sawchuk, Michael Dalsing

Research output: Contribution to journalArticle

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Abstract

A mathematic model of unilateral iliac vein obstruction was used to establish the theoretic basis for selecting saphenous vein or a larger diameter prosthetic cross-femoral venous bypass graft for relief of obstructive venous hypertension. Common femoral vein resting and postexercise peak flows, and common femoral vein and saphenous vein diameters were measured in 18 healthy individuals and used to estimate the pressure gradient (dP) across 20 cm long cross-femoral venous bypass grafts of saphenous vein or 4, 6, 8, 10, and 12 mm prosthetic conduits, in the presence of a transpelvic venous collateral network of varied cross section. The upper limits of normal for the gradients in our model (dPstd) were set at 4 mm Hg for resting flows and 6 mm Hg after exercise. Mean saphenous vein diameter was 4.3 ± 0.22 mm, which was 36.5% ± 1.73% of common femoral vein diameter. When the saphenous veins of two thirds of the individuals in our study were used as theoretic cross-femoral venous bypass conduits, > 80% of postobstruction peak cross-femoral venous bypass graft flow had to be carried by collaterals to maintain a gradient ≤ dPstd. We demonstrated that 4.5 to 6.0 mm diameter saphenous cross-femoral venous bypass grafts would be hemodynamically efficacious in relieving venous hypertension, but only when implanted in parallel with an existing venous collateral network that limited the preoperative dP to 4.5 to 7.5 mm Hg at resting flows and 7.0 to 11.5 mm Hg after exercise; only 44% of saphenous veins were adequate for cross-femoral venous bypass grafts by these criteria. Prosthetic cross-femoral venous bypass conduits of ≥ 8 mm diameter eliminated venous hypertension even in the absence of collateral venous flow.

Original languageEnglish
Pages (from-to)622-630
Number of pages9
JournalJournal of Vascular Surgery
Volume13
Issue number5
DOIs
StatePublished - 1991

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Saphenous Vein
Thigh
Transplants
Femoral Vein
Hypertension
Iliac Vein
Mathematics
Pressure

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Surgery

Cite this

Inadequacy of saphenous vein grafts for cross-femoral venous bypass. / Lalka, Stephen G.; Lash, Julia M.; Unthank, Joseph L.; Lalka, Valerie K.; Cikrit, Dolores F.; Sawchuk, Alan; Dalsing, Michael.

In: Journal of Vascular Surgery, Vol. 13, No. 5, 1991, p. 622-630.

Research output: Contribution to journalArticle

Lalka, Stephen G. ; Lash, Julia M. ; Unthank, Joseph L. ; Lalka, Valerie K. ; Cikrit, Dolores F. ; Sawchuk, Alan ; Dalsing, Michael. / Inadequacy of saphenous vein grafts for cross-femoral venous bypass. In: Journal of Vascular Surgery. 1991 ; Vol. 13, No. 5. pp. 622-630.
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abstract = "A mathematic model of unilateral iliac vein obstruction was used to establish the theoretic basis for selecting saphenous vein or a larger diameter prosthetic cross-femoral venous bypass graft for relief of obstructive venous hypertension. Common femoral vein resting and postexercise peak flows, and common femoral vein and saphenous vein diameters were measured in 18 healthy individuals and used to estimate the pressure gradient (dP) across 20 cm long cross-femoral venous bypass grafts of saphenous vein or 4, 6, 8, 10, and 12 mm prosthetic conduits, in the presence of a transpelvic venous collateral network of varied cross section. The upper limits of normal for the gradients in our model (dPstd) were set at 4 mm Hg for resting flows and 6 mm Hg after exercise. Mean saphenous vein diameter was 4.3 ± 0.22 mm, which was 36.5{\%} ± 1.73{\%} of common femoral vein diameter. When the saphenous veins of two thirds of the individuals in our study were used as theoretic cross-femoral venous bypass conduits, > 80{\%} of postobstruction peak cross-femoral venous bypass graft flow had to be carried by collaterals to maintain a gradient ≤ dPstd. We demonstrated that 4.5 to 6.0 mm diameter saphenous cross-femoral venous bypass grafts would be hemodynamically efficacious in relieving venous hypertension, but only when implanted in parallel with an existing venous collateral network that limited the preoperative dP to 4.5 to 7.5 mm Hg at resting flows and 7.0 to 11.5 mm Hg after exercise; only 44{\%} of saphenous veins were adequate for cross-femoral venous bypass grafts by these criteria. Prosthetic cross-femoral venous bypass conduits of ≥ 8 mm diameter eliminated venous hypertension even in the absence of collateral venous flow.",
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