Abstract
BAL in patients with ARDS provides material containing the soluble and cellular constituents of the alveolar compartment, and hence is a useful tool for the study of the pathogenesis of ARDS. The technique is imperfect as it is prone to problems of data acquisition and interpretation. However, it is lung-specific and may be used in serial studies of patients over the course of their disease. A large amount of evidence is rapidly being accumulated which documents the presence of effectors of inflammation in the BAL fluids of patients with ARDS. Confirmation of the importance of such mediators, pathways, or cellular constituents of BAL fluid in establishing the pathogenesis of ARDS ultimately depends upon proof of the efficacy of specific clinical interventions which both arrest the activity of the effector and predictably alter the course of the disease.
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