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Comment on: Bronchoalveolar lavage fluid lymphocytosis in chronic hypersensitivity pneumonitis: a systematic review and meta-analysis

Onofre Moran-Mendoza, Mohamed Khalil
European Respiratory Journal 2021 57: 2004347; DOI: 10.1183/13993003.04347-2020
Onofre Moran-Mendoza
Queen's University, Division of Respiratory and Sleep Medicine, Kingston, ON, Canada
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Mohamed Khalil
Queen's University, Division of Respiratory and Sleep Medicine, Kingston, ON, Canada
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Extract

We commend Adderley et al. [1] for their meta-analysis assessing bronchoalveolar lavage fluid (BALF) lymphocytosis in the diagnosis of chronic hypersensitivity pneumonitis. Distinguishing chronic hypersensitivity pneumonitis (cHP) from idiopathic pulmonary fibrosis (IPF) has prognostic and therapeutic implications. Since there are no studies using lung biopsy as the gold standard to answer this question, the authors had to rely on observational studies, some of which used BALF lymphocytosis as a criterion to diagnose cHP. The authors acknowledge that this can cause diagnostic test incorporation bias. Incorporation bias can result in falsely increased estimates of the association between BALF lymphocytosis and cHP, or in biased conclusions that a bronchoalveolar lavage (BAL) lymphocyte count can rule in or rule out cHP. This is because specificity and sensitivity can be affected when the test under study is used as part of the gold standard to diagnose the condition of interest [2].

Abstract

Bronchoalveolar lavage fluid lymphocytosis may be useful in the diagnosis of chronic hypersensitivity pneumonitis. However, reanalysis after eliminating studies that used bronchoalveolar lavage lymphocytosis as part of the diagnostic criteria is needed. https://bit.ly/34AmHmm

Footnotes

  • Conflict of interest: O. Moran-Mendoza has nothing to disclose.

  • Conflict of interest: M. Khalil has nothing to disclose.

  • Received November 27, 2020.
  • Accepted December 13, 2020.
  • ©ERS 2021.
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Comment on: Bronchoalveolar lavage fluid lymphocytosis in chronic hypersensitivity pneumonitis: a systematic review and meta-analysis
Onofre Moran-Mendoza, Mohamed Khalil
European Respiratory Journal Feb 2021, 57 (2) 2004347; DOI: 10.1183/13993003.04347-2020

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Comment on: Bronchoalveolar lavage fluid lymphocytosis in chronic hypersensitivity pneumonitis: a systematic review and meta-analysis
Onofre Moran-Mendoza, Mohamed Khalil
European Respiratory Journal Feb 2021, 57 (2) 2004347; DOI: 10.1183/13993003.04347-2020
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