Assessments of thrombogenicity by three in vitro techniques

Douglas J. Skarada, Geoffrey R. Erickson, Kindra L. Warnecke, Tracey V. du Laney, Charles S. Greenberg, Edmond F. Ritter, Bruce Klitzman

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This study assessed three in vitro techniques designed to measure the thrombogenicity of vascular grafts. All techniques immersed vascular grafts in rotating blood. In the gravimetric analysis, the weight of adherent thrombi was recorded at 2 min intervals for 20 min. In the torque analysis, a microviscometer continuously recorded the amount of torque developed as the graft rotated for 20 min. In the thrombin analysis, the blood sample was analyzed for fibrinopeptide A production indicating fibrinogen clevage. Expanded polytetrafluoroethylene grafts were treated by removal of air nuclei (denucleation), binding of heparin, or binding of polyethylene oxide (PEO). The gravimetric analysis determined that the time at which each group experienced clot initiation was as follows: control after 6 min, denucleation after 14 min, heparin after 18 min, and PEO after 10 min. Similarly, in the torque analysis all treatment groups significantly delayed the initial increase in torque from 8.0 min for control to 12.5 min for denucleation (P < .01), > 20 min for heparin (P < 0.1), and 12 min for PEO (P < .05). The thrombin analysis determined that coagulation activity was reduced relative to control at 12 min with the denucleation group (P < .05) and heparin group (P < .01) and at 18 min with all treatment groups (P < .01). The similarity of results among the techniques increases confidence that each measurement accurately predicts in vitro thrombogenicity. © 1995 John Wiley & Sons, Inc.

Original languageEnglish (US)
Pages (from-to)1039-1045
Number of pages7
JournalJournal of Biomedical Materials Research
Issue number9
StatePublished - Sep 1995
Externally publishedYes

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering


Dive into the research topics of 'Assessments of thrombogenicity by three in vitro techniques'. Together they form a unique fingerprint.

Cite this