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AT activity (%), antithrombin activity level measured as a percent of normal; rAT, recombinant antithrombin. The target AT activity range was 80–120% for our patients supported on ECMO. Patient 1 and Patient 5 failed to reach our desired range throughout their rAT therapy. The median time to reach the targeted AT activity range was 11 hours (range, 10–17 hours). ECMO, extracorporeal membrane oxygenation.
