Measures of ventilation heterogeneity mapped with hyperpolarized helium‐3 MRI demonstrate a T2‐high phenotype in asthma. Issue 6 (23rd February 2021)

• Record Type: Journal Article
• Authors: Gerald Teague, W.; Mata, Jaime; Qing, Kun; Tustison, Nicholas J.; Mugler, John P.; Meyer, Craig H.; de Lange, Eduard E; Shim, Yun M.; Wavell, Kristin; Altes, Talissa A.
• Is Part Of: Pediatric pulmonology. Volume 56:Issue 6(2021)
• Page Start: 1440
• Page End: 1448
• Publication Date: 2021-02-23
• Subjects: helium‐3 lung MRI -- hyperpolarized lung MRI -- maldistribution of ventilation -- severe asthma -- ventilation heterogeneity; Pediatric respiratory diseases -- Periodicals; Pediatrics -- Periodicals; 618.922
• DOI: 10.1002/ppul.25303
• Languages: English
• ISSNs: 8755-6863

Abstract

Abstract: Background: Hyperpolarized gas with helium (HHe‐3) MR (magnetic resonance) is a noninvasive imaging method which maps and quantifies regions of ventilation heterogeneity (VH) in the lung. VH is an important feature of asthma, but little is known as to how VH informs patient phenotypes. Purpose: To determine if VH indicators quantified by HHe‐3 MR imaging (MRI) predict phenotypic characteristics and map to regions of inflammation in children with problematic wheeze or asthma. Methods: Sixty children with poorly‐controlled wheeze or asthma underwent HHe‐3 MRI, including 22 with bronchoalveolar lavage (BAL). The HHe‐3 signal intensity defined four ventilation compartments. The non‐ventilated and hypoventilated compartments divided by the total lung volume defined a VH index (VHI %). Results: Children with VHI % in the upper quartile had significantly greater airflow limitation, bronchodilator responsiveness, blood eosinophils, expired nitric oxide (FeNO), and BAL eosinophilic or neutrophilic granulocyte patterns compared to children with VHI % in the lower quartile. Lavage return from hypoventilated bronchial segments had greater eosinophil % than from ventilated segments. Conclusion: In children with asthma, greater VHI % as measured by HHe‐3 MRI identifies a severe phenotype with higher type 2 inflammatory markers, and maps to regions of lung eosinophilia. Listed on ClinicalTrials. gov (NCT02577497).