Relative ability of full and partial forced expiratory maneuvers to identify diminished airway function in infants...

Area of Science:

• Pediatric Pulmonology
• Respiratory Physiology
• Infant Health

Background:

• Infant airway function assessment is critical for early disease detection.
• Tidal and raised volume rapid thoracoabdominal compression are emerging techniques.
• Cystic Fibrosis (CF) diagnosis in infancy necessitates sensitive airway function evaluation.

Purpose of the Study:

• To compare the efficacy of tidal and raised volume techniques in identifying diminished airway function in infants with CF.
• To assess airway function in CF infants with and without prior lower respiratory illness.
• To correlate objective lung function measurements with clinical respiratory assessments.

Main Methods:

• Cross-sectional, prospective study involving 47 infants with CF and 187 healthy controls.
• Measurement of VmaxFRC (tidal technique) and FVC, FEV0.5, FEF75, FEF25-75 (raised volume technique).
• Statistical analysis using multiple linear regression and comparison with clinical assessments.

Main Results:

• FEV0.5 was significantly diminished in 13 infants with CF, including 4 considered clinically normal.
• Only one CF infant had reduced VmaxFRC, indicating lower sensitivity of the tidal technique.
• The raised volume technique identified diminished airway function more frequently in CF infants.

Conclusions:

• Airway function is compromised in infants with CF, regardless of clinical status or prior respiratory infections.
• The raised volume technique is more sensitive for detecting early airway dysfunction in infants with CF.
• Early detection of airway dysfunction in CF infants is possible even with normal clinical findings.