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Longitudinal lung function and structural changes in children with primary ciliary dyskinesia.

Marie Lémery Magnin1, Pierrick Cros, Nicole Beydon

  • 1Assistance Publique-Hôpitaux de Paris, Hôpital Armand-Trousseau, Service de Radiologie Pédiatrique, Paris, France.

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In children with primary ciliary dyskinesia (PCD), lung function tests and chest CT scans show progressive declines and worsening structural damage over time. These functional and structural impairments are significantly correlated, even during stable clinical periods.

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Area of Science:

  • Pediatric Pulmonology
  • Medical Imaging
  • Respiratory Medicine

Background:

  • Primary ciliary dyskinesia (PCD) requires regular lung monitoring.
  • Evaluating the relationship between lung function tests (LFTs) and chest computed tomography (CT) is crucial for managing PCD patients.
  • Understanding these relationships in children with PCD during stable clinical conditions is key.

Purpose of the Study:

  • To assess transversal and longitudinal associations between LFTs and CT findings in children with PCD.
  • To investigate how lung function and structure change over time in pediatric PCD patients.
  • To establish correlations between functional and structural lung changes in stable PCD patients.

Main Methods:

  • Retrospective collection of data from children diagnosed with PCD at a French National Center.
  • Inclusion of patients with at least 8 years of follow-up and concurrent LFT and CT data during clinical stability.
  • Analysis of spirometry, blood gas analysis, and CT scores in 20 children (median follow-up 15.4 years).

Main Results:

  • Significant age-related decline in LFT indices including PaO(2), FVC, FEV(1), and FEF(2575%).
  • CT scans revealed common abnormalities such as bronchiectasis, mucous plugging, and peribronchial thickening.
  • CT scores increased with age and showed negative correlations with longitudinal changes in LFTs.

Conclusions:

  • Functional and structural lung impairments in children with PCD are significantly correlated, even in stable clinical states.
  • Further prospective studies with larger cohorts are needed to validate these findings.
  • The results suggest potential for optimizing CT frequency based on lung function monitoring to minimize radiation exposure.