Nebulized heparin reduces levels of pulmonary coagulation activation in acute lung injury

  • Barry Dixon1Email author,

    Affiliated with

    • Marcus J Schultz2,

      Affiliated with

      • Jorrit J Hofstra2,

        Affiliated with

        • Duncan J Campbell3, 4 and

          Affiliated with

          • John D Santamaria1

            Affiliated with

            Critical Care201014:445

            DOI: 10.1186/cc9269

            Published: 20 October 2010

            Previously in this journal, we published a phase 1 study of nebulized heparin in patients with acute lung injury [1]. Patients were administered heparin at doses of 50,000, 100,000, 200,000, or 400,000 U/day for 2 days, and bronchoalveolar lavage (BAL) fluid samples were taken at baseline and after the last heparin dose. The study demonstrated a trend to reduced coagulation activation (prothrombin fragments) in BAL fluid after the last dose of nebulized heparin [1].

            Following publication of these data, we were offered the possibility of further analysis of the BAL fluid with additional markers of coagulation activation, including thrombin-antithrombin complexes (TATcs), fibrin degradation products (FDPs), and plasminogen activator activity (PAI-1) levels. We wish to publish the results of this further analysis. The 400,000 U/day group had one patient more than the same group in the previously published data.

            We found that TATc and FDP levels were significantly reduced in patients treated with 400,000 U/day of nebulized heparin, but not PAI-1 (Figure 1 overleaf). We believe that these data are important as they demonstrate for the first time that nebulized heparin significantly reduces coagulation activation in the lungs of critically ill patients with acute lung injury. This may be important knowledge as inflammatory mechanisms related to coagulation activation, such as hyaline membrane formation and microvascular thrombosis, may mediate lung injury [2, 3].
            http://static-content.springer.com/image/art%3A10.1186%2Fcc9269/MediaObjects/13054_2010_Article_8767_Fig1_HTML.jpg
            Figure 1

            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.

            Abbreviations

            BAL: 

            bronchoalveolar lavage

            FDP: 

            fibrin degradation product

            PAI-1: 

            plasminogen activator activity

            TATc: 

            thrombin-antithrombin complex.

            Declarations

            Authors’ Affiliations

            (1)
            Department of Intensive Care St. Vincent's Hospital
            (2)
            Department of Intensive Care Medicine & Laboratory of Experimental Intensive Care and Anesthesiology, The Academic Medical Center
            (3)
            St Vincent's Institute of Medical Research
            (4)
            Department of Medicine, The University of Melbourne

            References

            1. Dixon B, Santamaria JD, Campbell DJ: A phase 1 trial of nebulised heparin in acute lung injury. Crit Care 2008, 12:R64.PubMedView Article
            2. Dixon B: The role of microvascular thrombosis in sepsis. Anaesth Intensive Care 2004, 32:619–629.PubMed
            3. Blaisdell FW: Pathophysiology of the respiratory distress syndrome. Arch Surg 1974, 108:44–49.PubMed

            Copyright

            © BioMed Central Ltd 2010

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