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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

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Sputum Studies II: Culture and Sensitivity

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Related Experiment Video

Updated: May 27, 2026

Methodology for Sputum Induction and Laboratory Processing
13:28

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Published on: December 17, 2017

Persistent sputum cellularity and neutrophils may predict bronchiectasis.

Nicole Drost1, Liesel D'silva, Ryan Rebello

  • 1Division of Respirology, St Joseph's Healthcare, Ontario, Canada.

Canadian Respiratory Journal
|November 8, 2011
PubMed
Summary
This summary is machine-generated.

Quantitative sputum cell counts can help identify bronchiectasis in patients with recurrent bronchitis. High total cell counts with predominant neutrophils suggest this condition, aiding diagnosis.

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Area of Science:

  • Pulmonary Medicine
  • Diagnostic Imaging
  • Respiratory System Research

Background:

  • Quantitative analysis of sputum cells accurately assesses bronchitis type and severity.
  • Recurrent bronchitis patients may have undiagnosed bronchiectasis.
  • Identifying bronchiectasis early is crucial for effective management.

Purpose of the Study:

  • To determine if sputum cell counts can identify bronchiectasis in patients experiencing recurrent bronchitis.
  • To establish sputum cell count thresholds predictive of bronchiectasis.
  • To correlate sputum cellularity with bronchiectasis severity.

Main Methods:

  • Retrospective analysis of a clinical database (2004-2005) of sputum cell counts in obstructive airway diseases to identify bronchiectasis predictors via ROC curves.
  • Prospective evaluation (2005-2008) using high-resolution computed tomography (HRCT) scans, independently scored by a blinded radiologist.
  • Utilized quantitative sputum cell counts, focusing on total cell count and neutrophil percentage.

Main Results:

  • Retrospective analysis identified 41 bronchiectasis cases among 490 patients.
  • Sputum total cell count ≥ 60 × 10^6/g with predominant neutrophils on two occasions showed 86.7% sensitivity and 87.5% specificity for bronchiectasis.
  • Prospective validation confirmed 71% of patients meeting criteria had bronchiectasis; cell counts correlated with radiographic severity.

Conclusions:

  • Persistent or recurrent elevated sputum cellularity, particularly neutrophilia, is indicative of bronchiectasis.
  • Sputum cell counts serve as a valuable, non-invasive tool for suggesting bronchiectasis in at-risk patients.
  • This finding supports integrating quantitative sputum analysis into the diagnostic workup for recurrent bronchitis.