Coagulation-induced resistance to fluid flow in small-diameter vascular grafts and graft mimics measured by purging pressure.

Published

Journal Article

In this study, the coagulation-induced resistance to flow in small-diameter nonpermeable Tygon tubes and permeable expanded polytetrafluoroethylene (ePTFE) vascular grafts was characterized by measuring the upstream pressure needed to purge the coagulum from the tube lumen. This purging pressure was monitored using a closed system that compressed the contents of the tubes at a constant rate. The pressure system was validated using a glycerin series with well-defined viscosities and precisely controlled reductions in cross-sectional area available for flow. This system was then used to systematically probe the upstream pressure buildup as fibrin glue, platelet-rich plasma (PRP) or whole blood coagulated in small-diameter Tygon tubing and or ePTFE grafts. The maximum purging pressures rose with increased clot maturity for fibrin glue, PRP, and whole blood in both Tygon and ePTFE tubes. Although the rapidly coagulating fibrin glue in nonpermeable Tygon tubing yielded highly consistent purging curves, the significantly longer and more variable clotting times of PRP and whole blood, and the porosity of ePTFE grafts, significantly diminished the consistency of the purging curves.

Full Text

Duke Authors

Cited Authors

  • Nichols, MD; Choudhary, R; Kodali, S; Reichert, WM

Published Date

  • November 2013

Published In

Volume / Issue

  • 101 / 8

Start / End Page

  • 1367 - 1376

PubMed ID

  • 24591220

Pubmed Central ID

  • 24591220

Electronic International Standard Serial Number (EISSN)

  • 1552-4981

International Standard Serial Number (ISSN)

  • 1552-4973

Digital Object Identifier (DOI)

  • 10.1002/jbm.b.32954

Language

  • eng