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The administration of heparin by nebulisation has been proposed for the 'local' treatment of pulmonary coagulation disturbances in acute lung injury (ALI). Alveolar and lung micro-vascular fibrin accumulation and breakdown inhibition indeed play a central role in the development and clinical course of this disease. Preclinical studies provide some evidence of the beneficial effects of heparin inhalation in several animal models of ALI. Clinical investigations are sparse, and trials such as the one presented by Dixon and colleagues in a recent issue of Critical Care are welcome as they provide insight into the possible clinical use of nebulised heparin in this situation. This phase 1 trial involved 16 patients with early ALI, and showed the feasibility of the approach. In addition, non-significant changes in respiratory functions and systemic anticoagulant effects were documented with the four doses tested. The study of Dixon and colleagues adds to data that helps pave the way towards a possible clinical use of heparin by nebulisation in ALI. It remains to be clarified in which clinical situations, at what time points and with which dosages the best chances exist for a beneficial effect on the prognosis of these patients.

Nebulised heparin: a new approach to the treatment of acute lung injury?