Trade-off between airway resistance and optical resolution in pediatric rigid bronchoscopy

Area of Science:

• Pediatric Pulmonology
• Medical Optics
• Biomedical Engineering

Background:

• Advancements in neonatal care increase survival of premature infants with bronchopulmonary diseases.
• Rigid bronchoscopy is essential for diagnosing and treating pediatric airway conditions.
• Miniaturized telescopic bronchoscopes are critical for performing procedures in small infant airways.

Purpose of the Study:

• To evaluate airway pressures and optical resolution of pediatric rigid bronchoscopes with varying telescope configurations.
• To analyze the trade-offs between airway resistance and optical resolution for different bronchoscope-telescope combinations.
• To provide recommendations for optimal bronchoscope and telescope pairings in pediatric procedures.

Main Methods:

• Measurement of airway pressures through bronchoscopes with and without endoscopic telescopes.
• Quantitative analysis of optical resolution for different instrument combinations.
• Assessment of the impact of optical and side-channel forceps on airway resistance.

Main Results:

• The 1.9-mm endoscopic telescope offers the best resistance and resolution for 2.5- to 3.0-mm bronchoscopes.
• The 2.8-mm telescope is optimal for 3.5-mm bronchoscopes.
• The 4.0-mm telescope is best suited for 4.0-mm and larger bronchoscopes.
• Optical and side-channel forceps minimally affect airway resistance during foreign body removal.

Conclusions:

• Specific bronchoscope and telescope size combinations can be recommended to optimize pediatric rigid bronchoscopy.
• Careful selection of instruments balances the need for clear visualization with minimizing airway resistance.
• Current accessory instruments have a negligible impact on airway resistance.