Coronary artery in-stent stenosis persists despite inhibition of the von Willebrand factor--collagen interaction in baboons.

Revascularization techniques, such as angioplasty and stent implantation, frequently lead to restenosis due to the formation of neointima after platelet activation and the concomitant release of various smooth muscle cell mitogenic and attractant factors. We here investigate whether inhibition of initial platelet adhesion after stent implantation can decrease neointima formation in a clinically relevant baboon model of in-stent stenosis using standard treatment with aspirin, clopidogrel and heparin. Inhibition of platelet adhesion was established by administration of the anti-von Willebrand factor (VWF) monoclonal antibody 82D6A3, which inhibits VWF binding to collagen.

Correlation of in vitro platelet quality measurements with in vivo platelet viability in human subjects.

Background And Objectives: Changes in in vitro platelet quality parameters during platelet storage are associated with a decrease of in vivo platelet viability after platelet transfusion. Many attempts have been made to identify the most predictable in vitro parameters for in vivo performance. We used a riboflavin-based ultraviolet (UV) light treatment process designed to inactivate pathogens and white blood cell (WBC) contaminants in blood products as a model system in which to study the correlation of in vitro cell quality with in vivo viability.