Primary ciliary dyskinesia cases bronchoscopic sampling and TEM analysis: sampling & diagnosis in PCD

Area of Science:

• Pulmonology
• Genetics
• Microscopy

Background:

• Primary ciliary dyskinesia (PCD) is a rare genetic disorder causing chronic respiratory issues due to impaired cilia.
• Diagnosing PCD is challenging due to variable symptoms and lack of a definitive test.
• PCD is a key cause of bronchiectasis, necessitating accurate diagnostic methods.

Purpose of the Study:

• To evaluate bronchoscopic techniques for obtaining respiratory samples for transmission electron microscopy (TEM).
• To assess the diagnostic yield of bronchial brushing and forceps biopsies in suspected PCD cases.
• To identify ultrastructural axonemal defects indicative of PCD.

Main Methods:

• Adults with suspected PCD and bronchiectasis underwent fiberoptic bronchoscopy.
• Bronchial forceps and brush biopsies were collected from specific airway segments.
• Samples were processed for TEM to analyze ciliary ultrastructure.

Main Results:

• Brush biopsies and forceps biopsy fixative solutions yielded higher scores for ciliated cells and cilia cross-sections compared to forceps tissue.
• TEM revealed abundant ciliated cells and abnormal cilia structures in pellets, aiding PCD diagnosis.
• Bronchial brushing combined with forceps biopsy enhanced diagnostic sample quality.

Conclusions:

• Bronchoscopic techniques, particularly bronchial brushing, improve sample adequacy for TEM analysis in PCD diagnosis.
• Accurate PCD diagnosis through enhanced bronchoscopic sampling can guide timely management.
• Improved diagnostic yield facilitates better patient outcomes for individuals with PCD and bronchiectasis.