Evaluating post-bronchodilator response in well-controlled paediatric severe asthma using hyperpolarised 129Xe-MRI: A...

Area of Science:

• Pulmonary Medicine
• Medical Imaging
• Pediatric Respiratory Diseases

Background:

• Pulmonary function tests (PFTs) offer global lung function assessment in pediatric asthma.
• Hyperpolarized xenon-129 magnetic resonance imaging (129Xe-MRI) provides spatial lung function analysis.
• Current methods lack sensitivity for detecting subtle ventilation changes in well-controlled pediatric asthma.

Purpose of the Study:

• To evaluate 129Xe-MRI for detecting ventilation abnormalities in children with well-controlled severe asthma.
• To assess the impact of bronchodilators on ventilation defects using 129Xe-MRI.
• To explore 129Xe-MRI's potential as a biomarker for asthma assessment.

Main Methods:

• Cross-sectional cohort study comparing healthy children and those with severe asthma.
• Utilized spirometry, multiple breath washout (MBW), and 129Xe-MRI.
• 129Xe-MRI and PFTs were performed pre- and post-bronchodilator in the asthma cohort.

Main Results:

• Children with asthma exhibited significantly more ventilation defects pre-bronchodilator compared to healthy controls and post-bronchodilator.
• 129Xe-MRI revealed a higher ventilation defect percentage (VDP) and coefficient of variation (CoV) in asthmatic children pre-bronchodilator.
• Post-bronchodilator, VDP and CoV significantly decreased in the asthma group, normalizing compared to controls.

Conclusions:

• 129Xe-MRI is a sensitive tool for identifying ventilation inhomogeneity in pediatric severe asthma.
• The technique shows promise as a biomarker for monitoring disease progression and treatment response.
• Spatial lung function assessment with 129Xe-MRI offers advantages over global PFTs.