Journal article
Ventilation defects on hyperpolarized helium-3 MRI in asthma are predictive of 2-year exacerbation frequency
Journal of allergy and clinical immunology, Vol.146(4), pp.831-839.e6
10/2020
DOI: 10.1016/j.jaci.2020.02.029
PMCID: PMC7487001
PMID: 32173351
Abstract
There is an unmet need for an objective biomarker to predict asthma exacerbations.
Our aim was to assess the ventilation defect percent (VDP) on hyperpolarized helium-3 magnetic resonance imaging as a predictor of exacerbation frequency following imaging.
Subjects underwent hyperpolarized helium-3 and conventional clinical measurements, including pulmonary function tests, during a period of disease stability, and exacerbations were recorded prospectively over the following 2 years. We used a Poisson regression tree model to estimate an optimal VDP threshold for classifying subjects into high- versus low-exacerbation groups and then used statistical regression to compare this VDP threshold against conventional clinical measures as predictors of exacerbations.
A total of 67 individuals with asthma (27 males and 40 females, 28 with mild-to-moderate asthma and 39 with severe asthma) had a median VDP of 3.75% (1.2% [first quartile]-7.9% [third quartile]). An optimal VDP threshold of 4.28% was selected on the basis of the maximum likelihood estimation of the regression tree model. Subjects with a VDP greater than 4.28% (n = 32) had a median of 1.5 exacerbations versus 0.0 for subjects with a VDP less than 4.28% (n = 35). In a stepwise multivariate regression model, a VDP greater than 4.28% was associated with an exacerbation incidence rate ratio of 2.5 (95% CI = 1.3-4.7) versus a VDP less than or equal to 4.28%. However, once individual medical history was included in the model, VDP was no longer significant. Nonetheless, VDP may provide an objective and complementary quantitative marker of individual exacerbation risk that is useful for monitoring individual change in disease status, selecting patients for therapy, and assessing treatment response.
VDP measured with magnetic resonance imaging shows promise as a biomarker of prospective asthma exacerbations.
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Details
- Title: Subtitle
- Ventilation defects on hyperpolarized helium-3 MRI in asthma are predictive of 2-year exacerbation frequency
- Creators
- David G Mummy - Duke UniversityKatherine J Carey - University of Wisconsin–MadisonMichael D Evans - University of MinnesotaLoren C Denlinger - University of Wisconsin–MadisonMark L Schiebler - University of Wisconsin–MadisonRonald L Sorkness - University of Wisconsin–MadisonNizar N Jarjour - University of Wisconsin–MadisonSean B Fain - University of Wisconsin–Madison
- Resource Type
- Journal article
- Publication Details
- Journal of allergy and clinical immunology, Vol.146(4), pp.831-839.e6
- DOI
- 10.1016/j.jaci.2020.02.029
- PMID
- 32173351
- PMCID
- PMC7487001
- NLM abbreviation
- J Allergy Clin Immunol
- ISSN
- 0091-6749
- eISSN
- 1097-6825
- Publisher
- Elsevier Inc
- Grant note
- U10 HL109168 / National Heart, Lung, and Blood Institute (https://doi.org/10.13039/100000050) National Institutes of Health (https://doi.org/10.13039/100000002) UL/TR000427 / National Institutes of Health Clinical Translation and Science S10 OD016394 / National Institutes of Health/National Center for Advancing Translational Sciences
- Language
- English
- Date published
- 10/2020
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology; Electrical and Computer Engineering; Health, Sport, and Human Physiology
- Record Identifier
- 9984275057102771
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