Tracheal squamous metaplasia in children with endotracheal intubation or tracheostomy

Area of Science:

• Pediatric Pulmonology
• Respiratory Pathology
• Epithelial Biology

Background:

• The tracheal epithelium's normal differentiation is crucial for airway function.
• Squamous metaplasia, a change in cell type, can impair mucociliary clearance and airway defense.
• Understanding factors contributing to tracheal metaplasia in children is important for respiratory health.

Purpose of the Study:

• To compare tracheal epithelial differentiation in intubated children, children with tracheostomy, and non-intubated controls.
• To determine the presence or absence of squamous metaplasia in these pediatric groups.
• To investigate the association between airway interventions and tracheal epithelial changes.

Main Methods:

• Tracheal biopsies were collected from intubated neonates, children with tracheostomy, and non-intubated controls.
• Tissue samples were processed and stained with Hematoxylin and Eosin (H&E).
• Immunohistochemistry was performed using markers for epithelial differentiation (B-tubulin, CC10, Muc5ac, P63, keratin5, keratin14).

Main Results:

• Squamous metaplasia was present in all 3 intubated infants studied.
• Squamous metaplasia was observed in all 3 children with tracheostomy undergoing granuloma excision.
• No squamous metaplasia was detected in any of the 7 non-intubated control children.

Conclusions:

• A significant association exists between tracheal intubation or tracheostomy and squamous metaplasia in children.
• Squamous metaplasia was not observed in control pediatric tracheal biopsies without these interventions.
• These findings highlight the impact of airway support devices on tracheal epithelial integrity.