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Changes in markers of coagulation activation in bronchoalveolar fluid before and after 2 days of nebulized heparin. Each line represents a single patient (*P < 0.01, **P < 0.001, paired t test). FDP, fibrin degradation product; NS, not significant; PAI-1, plasminogen activator activity; TATc, thrombin-antithrombin complex.
