Plasma Proteinases, Proteinase Inhibitors and Other Selective Plasma Proteins following Aortofemoral Bypass Operation

Abstract

Monitoring of plasma proteinases, proteinase inhibitors and other selective plasma proteins was evaluated in patients undergoing Y-graft aortofemoral bypass operation. Fast-reacting acute-phase proteins (C-reactive protein, antichymotrypsin, α₁-acid glycoprotein) and slow-reacting proteins (haptoglobin, α₁-antitrypsin) increased significantly 48–120 h after operation. By contrast, no significant increase was found between plasma ceruloplasmin levels before clamping and after declamping. Activity and concentration of α₂-macroglobulin decreased postoperatively and remained significantly lowered throughout the observation period. Plasma levels of granulocyte elastase were elevated significantly 1 h after declamping, whereas trypsin-binding capacity decreased immediately after the release of the clamp. Aprotinin pretreatment caused higher trypsin-binding capacity of the plasma, significantly lower ‘unspecific’ proteolytic (azocasein-hydrolyzing) activity and significantly lower non-TCA precipitable low molecular weight plasma protein concentration. Our results confirm the data of several authors that monitoring of plasma proteinases, proteinase inhibitors and other selective plasma proteins may be helpful in evaluating surgical patients postoperatively.