Hepatoenteric ischemia-reperfusion increases circulating heparinoid activity in rabbits

Purpose:The purpose of this study was to determine if an increase in circul ating heparinoid activity contributes to the hemostatic abnormalities assoc iated with hepatoenteric ischemia-reperfusion. Materials and Methods: Anesthetized rabbit (n = 18) underwent thoracic aort a occlusion for 30 minutes with a balloon catheter, followed by 30 minutes of reperfusion, Blood samples were obtained after 30 minutes of equilibrati on and 30 minutes of reperfusion. Hemostatic function was assessed by chang es in the thrombelastographic variables R (reaction time), ct (a measure of the speed of clot formation), and G (a measure of clot strength). Thrombel astography was performed on blood without platelet inhibition in the presen ce or absence of heparinase (n = 9 rabbits), Additional samples (n = 9) wer e exposed to cytochalasin D (platelet inhibitor) with or without heparinase . Results: Compared with preischemic values, blood samples with intact platel et function obtained during reperfusion demonstrated a decrease in hemostat ic function evidenced by a significant(P<.05) increase in R, decrease in a, and decrease in G, R, <alpha>, and G values of samples without platelet in hibition exposed to heparinase did not significantly change after ischemia. Blood samples exposed to cytochalasin D displayed a similar pattern. Conclusion: An increase in circulating heparinoid activity significantly co ntributes to the hemostatic disorder associated with hepatoenteric ischemia -reperfusion in rabbits. Copyright (C) 2000 by W.B, Saunders Company.