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Optimal heparin surface concentration and antithrombin binding capacity as evaluated with human non-anticoagulated blood in vitro

Andersson, Jonas (author)
Uppsala universitet,Enheten för klinisk immunologi,Kaskadsystem och biomaterial
Sanchez, Javier (author)
Uppsala universitet,Enheten för klinisk immunologi,Kaskadsystem och biomaterial
Nilsson Ekdahl, Kristina (author)
Uppsala universitet,Enheten för klinisk immunologi,Kaskadsystem och biomaterial
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Elgue, Graciela (author)
Uppsala universitet,Enheten för klinisk immunologi,Kaskadsystem och biomaterial
Nilsson, Bo (author)
Uppsala universitet,Enheten för klinisk immunologi,Kaskadsystem och biomaterial
Larsson, Rolf (author)
Uppsala universitet,Enheten för klinisk immunologi,Kaskadsystem och biomaterial
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 (creator_code:org_t)
2003-10-14
2003
English.
In: Journal of Biomedical Materials Research. - : Wiley. - 0021-9304 .- 1097-4636. ; 67:2, s. 458-466
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Contact between blood and a biomaterial surface takes place in many applications and is known to activate the coagulation and complement systems. Heparin surface coatings have been shown to reduce blood activation upon contact with artificial surfaces. To establish the optimal heparin surface concentration, blood was incubated in a tubing loop model at 37 degrees C. The tubing was coated with different surface concentrations of heparin and rotated at three different velocities. We demonstrate that the blood compatibility of a surface with regard to coagulation, complement, and platelet activation can be improved by increasing the heparin surface concentration in the 6-12 pmol antithrombin/cm2 concentration interval. The binding of factor H is not influenced by the increased heparin surface concentration, suggesting that this factor is not the primary regulator of complement on heparin surfaces. In addition, the heparin coating has no effect on the complement activation that occurs on gas surfaces in extracorporeal circuits.

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