New Technique to Analyze the Breath Sound Spectrum in Children with Asthma

Area of Science:

• Respiratory Medicine
• Pediatric Pulmonology
• Biomarkers

Background:

• Breath sound parameters are recognized as valuable biomarkers for assessing airway conditions.
• Accurate and reliable methods for breath sound analysis are crucial for clinical applications.

Purpose of the Study:

• To investigate the reliability of an improved breath sound analysis method.
• To evaluate specific breath sound parameters as potential biomarkers for bronchial dilation in asthmatic children.

Main Methods:

• Eighty-three asthmatic children participated in the study.
• Breath sound spectrum analysis was performed before and after beta-2 agonist inhalation, with adjustments for background noise.
• Key parameters evaluated included total area under the curve (A_T), roll-off (Slope), area ratios (A₃/A_T, B₄/A_T), and power/frequency ratios (RPF₇₅, RPF₅₀).
• Spirography and forced oscillation technique were used for comparative assessment.

Main Results:

• Significant increases in A₃/A_T, B₄/A_T, RPF₇₅, and RPF₅₀ were observed post-inhalation.
• Increases in A₃/A_T and B₄/A_T correlated with improvements in FEV₁ and FEE_25-75.
• RPF₇₅ increase showed a reversible correlation with R5-R20 changes.

Conclusions:

• Spectrum curve indices, utilizing an adjusted zero level, effectively indicate bronchial dilation following beta-2 agonist administration.
• These breath sound parameters show promise for assessing bronchial reversibility in pediatric asthma patients.