Association between exhaled inflammatory markers and asthma control in children

Area of Science:

• Pediatric Pulmonology
• Respiratory Medicine
• Biomarkers

Background:

• Asthma control in children remains a challenge, with limited understanding of exhaled inflammatory markers.
• Current methods for assessing asthma control may not fully capture disease status.
• Investigating novel exhaled biomarkers is crucial for improving pediatric asthma management.

Purpose of the Study:

• To determine the association between exhaled inflammatory markers (FeNO, VOCs, cytokines/chemokines) and asthma control in children.
• To evaluate the ability of these markers to differentiate between persistently controlled and uncontrolled asthma.
• To explore the utility of exhaled breath analysis in pediatric asthma phenotyping.

Main Methods:

• A one-year observational study involving 96 asthmatic children.
• Regular assessment of asthma control, fractional nitric oxide (FeNO), lung function (FEV1, FVC), exhaled VOCs, and EBC cytokines/chemokines.
• Random Forest analysis and ROC-curve analysis for classification model evaluation.

Main Results:

• No significant association was found between FeNO, EBC markers, or general VOCs and overall asthma control.
• A panel of 15 exhaled VOCs demonstrated high accuracy (AUC 86%) in discriminating between persistently controlled and uncontrolled asthma.
• Inclusion of FeNO and EBC markers did not significantly improve the classification accuracy of VOCs (AUC 87%).

Conclusions:

• Exhaled inflammatory markers like FeNO and EBC cytokines/chemokines are not reliable indicators of asthma control in children.
• Specific exhaled VOC profiles show promise as objective biomarkers for distinguishing asthma control states in pediatric populations.
• VOC analysis may offer a non-invasive tool for identifying children with persistent uncontrolled asthma, aiding in personalized treatment strategies.