High-dose antithrombin III therapy had no effect on 28-day all-cause mortality in adult patients with severe sepsis and septic shock when administered within 6 hours after the onset. High-dose antithrombin III was associated with an increased risk of hemorrhage when administered with heparin. There was some evidence to suggest a treatment benefit of antithrombin III in the subgroup of patients not receiving concomitant heparin.

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Data from this post hoc analysis confirm an increased bleeding risk seen with AT treatment in these patients. When given early in severe sepsis, though statistically not significant, absolute risk reductions with AT of 21% and 14% for organ failure and mortality, respectively, indicate a potential for treatment benefit in selected sepsis patients. This observation may have implications for continuing sepsis trials with AT that focus on reduced patient heterogeneity.

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