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Related Experiment Video

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In vitro Measurements of Tracheal Constriction Using Mice
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Tracheal collapsibility in adults is dynamic over time.

Mette Nygaard1, Ole Hilberg2, Finn Rasmussen3

  • 1Department of Internal Medicine, Horsens Regional Hospital, Denmark.

Respiratory Medicine
|January 23, 2019
PubMed
Summary

Tracheal collapse can dynamically change over time, with many patients showing improved collapsibility. This pilot study suggests tracheal collapse is not static, and its progression is independent of morphology or treatment.

Keywords:
DynamicExcessive Dynamic Airway CollapseInfectionMorphologyPulmonary function test

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Area of Science:

  • Pulmonology
  • Radiology
  • Medical Imaging

Background:

  • Tracheal collapse is characterized by expiratory central airway collapse exceeding 50%.
  • The dynamic nature of tracheal collapsibility, similar to asthma, has been debated.
  • Tracheal morphology (e.g., crescent, saber-sheath) and potential influences like corticosteroids are considered.

Purpose of the Study:

  • To investigate the dynamic nature of tracheal collapsibility.
  • To determine if tracheal collapsibility changes over a 24-month period.
  • To explore correlations between collapsibility changes and tracheal morphology, corticosteroid use, or infections.

Main Methods:

  • Prospective study of 20 patients with pre-existing excessive tracheal collapse.
  • Repeat CT scans during full inspiration and end-expiration after patient training.
  • Calculation of percentage expiratory collapse and pulmonary function tests.

Main Results:

  • In 45% of patients, tracheal expiratory collapse improved by over 10% at follow-up.
  • 35% of patients showed disease progression with increased collapse.
  • 20% of patients had unchanged collapsibility; no correlation with morphology, corticosteroids, or infections was found.

Conclusions:

  • Tracheal collapsibility demonstrates dynamic changes, with a significant fraction of patients experiencing improvement.
  • Changes in tracheal collapsibility were not dependent on tracheal morphology, corticosteroid use, or recurrent infections.
  • No correlation was observed between changes in tracheal collapse and pulmonary function tests or symptoms.