The relationships among perioperative changes in plasma antithrombin (AT) activity, platelet counts, and clinical risk factors for postoperative thromboembolism has not been studied extensively in gynecologic patients. AT activity and platelet counts were determined preoperatively and on postoperative days 1 and 7 in 74 patients who underwent gynecologic surgery. The relationships between each clinical risk factor for postoperative thromboembolism and the decrease in AT activity and platelet count were analyzed using a univariate logistic regression model. No clinically significant thromboembolism occurred in any patient. AT activity and platelet counts decreased significantly on postoperative day 1 and exceeded preoperative levels on day 7. Postoperative patients with malignancy were more likely to exhibit decreased AT activity. AT activity decreased significantly with increases in operating time and blood loss. Known risk factors for postoperative thromboembolism did not appear to be associated with postoperative decreases in platelet counts. Transient hyperconsumption of AT and platelets occurs immediately after gynecologic surgery. Surgery-induced AT deficiency may contribute to postoperative thromboembolism in patients with long operating times and significant blood loss.
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