Exhaled breath profiling in diagnosing wheezy preschool children

Area of Science:

• Pediatric Pulmonology
• Biochemistry
• Analytical Chemistry

Background:

• Wheezing is prevalent in preschool children, but its causes remain unclear.
• Volatile organic compounds (VOCs) in exhaled breath offer potential as noninvasive biomarkers for early wheeze detection.
• Understanding the pathophysiology of early wheeze is crucial for timely intervention.

Purpose of the Study:

• To evaluate the feasibility of collecting exhaled VOCs from preschool-aged children.
• To determine if VOC profiles can distinguish between children with and without recurrent wheeze.
• To establish a foundation for further research into VOCs as biomarkers for preschool wheezing.

Main Methods:

• Exhaled breath samples were collected from preschool children with (n=202) and without (n=50) recurrent wheeze.
• Volatile organic compounds (VOCs) were analyzed using gas chromatography-time-of-flight mass spectrometry.
• Data analysis involved ANOVA simultaneous component analysis (ASCA) for pre-processing and sparse logistic regression (SLR) for profile generation and classification.

Main Results:

• Exhaled breath VOC collection was successful in 98% of participating children.
• A total of 913 distinct VOCs were identified in the exhaled breath samples.
• An SLR model utilizing 28 VOCs achieved 83% classification accuracy (84% sensitivity, 80% specificity) between groups.
• Cross-validation resulted in 73% correct classification (79% sensitivity, 50% specificity).

Conclusions:

• Collecting exhaled VOCs is a feasible method for preschool-aged children.
• Distinct VOC profiles can differentiate children with and without recurrent wheeze with reasonable accuracy.
• This study serves as a proof of principle for using VOCs as diagnostic markers in pediatric respiratory conditions.