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Prospective, Longitudinal Study of Plastic Bronchitis Cast Pathology and Responsiveness to Tissue Plasminogen Activator

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Abstract

Plastic bronchitis (PB) is a rare disease that often occurs in patients with congenital heart disease (CHD) who have undergone staged single-ventricle palliation. It is characterized by the formation of rubbery “casts” in the airways. PB treatment frequently includes inhaled tissue plasminogen activator (tPA). However, the efficacy of tPA to reduce cast burden is unknown. This is further complicated by our lack of knowledge of cast composition. We obtained spontaneously expectorated PB casts from children (n = 4) with CHD and one adult patient with idiopathic PB. Pathological assessment was made from paraffin-preserved samples. Casts were treated with phosphate-buffered saline (PBS) or tPA. Cast response to tPA was assessed by changes in cast weight and the production of fibrin d-dimer. Independent of dose, tPA reduced cast weight compared with PBS-treatment (P = 0.001) and increased d-dimer levels. Histological staining showed that PB casts from all patients were composed of fibrin and contained notable numbers of lymphocytes. Cast composition did not change over time. Collectively, these data support that in our PB patients, casts are composed of fibrin and are responsive to tPA treatment. This makes inhaled tPA a potentially viable option for symptomatic relief of PB while we work to unravel the complexity of PB pathogenesis.

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Acknowledgment

This work was supported by the National Institute of Child Health and Human Development (NICHD) grant No. R15 HD065594. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NICHD or the National Institutes of Health. This study was presented, in part, at the NIH Conference on Clinical Research for Rare Diseases, Bethesda, MD; September 21, 2010 and the American Thoracic Society Meeting, Denver, CO; May 13–18, 2011.

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Correspondence to Kathleen A. Stringer.

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Heath, L., Ling, S., Racz, J. et al. Prospective, Longitudinal Study of Plastic Bronchitis Cast Pathology and Responsiveness to Tissue Plasminogen Activator. Pediatr Cardiol 32, 1182–1189 (2011). https://doi.org/10.1007/s00246-011-0058-x

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  • DOI: https://doi.org/10.1007/s00246-011-0058-x

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