Safety and Efficacy of Preoperative Antithrombin Supplementation in Patients Undergoing High-Risk Cardiopulmonary Bypass

This is a prospective, multicenter, randomized, double-blind, placebo-controlled study. The purpose of this study is to determine the safety and effectiveness of human-derived antithrombin III (AT-III \[Human\]) supplementation prior to high-risk, non-emergency, cardiac surgery with cardiopulmonary bypass (CPB). A total of 404 adult subjects undergoing CPB who meet the study eligibility criteria were planned to be randomized to receive either AT-III (Human) or placebo.