Thoracic gas volume in early childhood

Area of Science:

• Pediatric Pulmonology
• Respiratory Physiology

Background:

• Assessing lung function in infants and young children presents unique challenges.
• Thoracic gas volume (TGV) is a key indicator of lung capacity and air trapping.

Purpose of the Study:

• To describe a total body plethysmograph for measuring TGV in infants and young children (birth to 2.5 years).
• To establish normal TGV values and identify TGV abnormalities in various pediatric respiratory conditions.

Main Methods:

• Utilized a total body plethysmograph adapted for pediatric use.
• Conducted 42 studies on 35 healthy infants and young children to determine normal TGV.
• Described TGV in 16 children with abnormal lung volumes.

Main Results:

• Established normal TGV values in healthy infants and young children.
• Found TGV correlated significantly with length, weight, chest circumference, and age.
• Identified low TGV in infants with respiratory distress syndrome, post-surgery complications, pulmonary infections, and chest cage abnormalities.
• Observed high TGV predominantly in infants with small airways disease.

Conclusions:

• The described total body plethysmograph is a valuable tool for assessing TGV in infants, including critically ill neonates.
• Abnormal TGV measurements can indicate specific respiratory pathologies in pediatric populations.
• TGV assessment aids in diagnosing and understanding lung volume issues in young children.