Quantitative analysis of dynamic airway changes after methacholine and salbutamol inhalation on xenon-enhanced chest CT.

Abstract:

OBJECTIVES:To investigate the dynamic changes in airways in response to methacholine and salbutamol inhalation and to correlate the xenon ventilation index on xenon-enhanced chest CTs in asthmatics. METHODS:Thirty-one non-smokers (6 normal, 25 asthmatics) underwent xenon-enhanced chest CT and pulmonary function tests. Images were obtained at three stages (basal state, after methacholine inhalation and after salbutamol inhalation), and the total xenon ventilation index (TXVI) as well as airway values were measured and calculated. The repeated measures ANOVA and Spearman's correlation coefficient were used for statistical analysis. RESULTS:TXVI in the normal group did not significantly change (P > 0.05) with methacholine and salbutamol. For asthmatics, however, the TXVI significantly decreased after methacholine inhalation and increased after salbutamol inhalation (P < 0.05). Of the airway parameters, the airway inner area (IA) significantly increased after salbutamol inhalation in all airways (P < 0.01) in asthmatics. Airway IA, wall thickness and wall area percentage did not significantly decrease after methacholine inhalation (P > 0.05). IA of the large airways was well correlated with basal TXVI, FEV(1) and FVC (P < 0.05). CONCLUSIONS:Airway IA is the most reliable parameter for reflecting the dynamic changes after methacholine and salbutamol inhalation, and correlates well with TXVI in asthmatics on xenon-enhanced CT. KEY POINTS :• In asthmatics, xenon ventilation decreases after methacholine and increases after salbutamol inhalation. • Inner airway area (IA) correlates well with xenon ventilation. • IA is the most reliable parameter reflecting airway changes in drug responses.

journal_name

Eur Radiol

journal_title

European radiology

authors

Park SJ,Lee CH,Goo JM,Kim JH,Park EA,Jung JW,Park HW,Cho SH

doi

10.1007/s00330-012-2516-0

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

2441-50

issue

11

eissn

0938-7994

issn

1432-1084

journal_volume

22

pub_type

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