Ventilation defects on hyperpolarized helium-3 MRI in asthma are predictive of 2-year exacerbation frequency

JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY

卷:146

Article

Mummy, David G.^1,2  Carey, Katherine J.^3,4  Evans, Michael D.⁸  Denlinger, Loren C.⁵  Schiebler, Mark L.⁴  Sorkness, Ronald L.⁶  Jarjour, Nizar N.⁵  Fain, Sean B.^3,4,7 

[1] Duke Univ, Dept Radiol, Durham, NC 27706 USA

[2] Duke Univ, Ctr In Vivo Microscopy, Durham, NC 27706 USA

[3] Univ Wisconsin, Dept Med Phys, Madison, WI 53706 USA

[4] Univ Wisconsin, Dept Radiol, Madison, WI 53706 USA

[5] Univ Wisconsin, Div Allergy Pulm & Crit Care Med, Madison, WI 53706 USA

[6] Univ Wisconsin, Sch Pharm, Madison, WI 53706 USA

[7] Univ Wisconsin, Dept Biomed Engn, Madison, WI 53706 USA

[8] Univ Minnesota Twin Cities, Clin & Translat Sci Inst, Minneapolis, MN USA

关键词: Asthma;    magnetic resonance imaging;    functional;    airway obstruction;    patient outcomes assessment;   

DOI  :  10.1016/j.jaci.2020.02.029

来源: Elsevier

【 摘 要 】

Background: There is an unmet need for an objective biomarker to predict asthma exacerbations. Objective: 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. Methods: 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. Results: 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 5 32) had a median of 1.5 exacerbations versus 0.0 for subjects with a VDP less than 4.28% (n 5 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 5 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. Conclusion: VDP measured with magnetic resonance imaging shows promise as a biomarker of prospective asthma.

【 授权许可】

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