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Expiratory air trapping during asthma exacerbation: Relationships with clinical indices and proximal airway morphology.

Abstract：

OBJECTIVES:To semi-quantitatively assess expiratory air trapping (AT(exp)) and structural changes in the proximal airways in asthma during asthma exacerbation (AE) and to explore the relationships among AT(exp), clinical indices, and proximal airway changes. METHODS:Paired inspiratory-dynamic forced expiratory CT scans of 36 asthmatics (30 women, 6 men; mean age, 49.2±18.9 years) performed during AE were retrospectively reviewed for the total AT(exp) score (summed scores [extent grading (0-4)×pattern grading (1-4)] of the twelve lung zones), morphologic parameters and expiratory bronchial collapse (BC(exp)) of the proximal airways. The relationships of the score with clinical indices and proximal airway morphology (normalized by body surface area [BSA]) were analyzed. A p value of <0.05 was considered statistically significant. RESULTS:The mean total AT(exp) score was 110.1±43.4 (range, 8-166). It was higher in the lower zones and in patients older than 60 years, having BMI of <27.5 kg/m(2), and peak expiratory flow rate (PEFR) of <60% predicted. Correlation existed between the score and age (r=0.331), BMI (r=-0.375), BSA (r=-0.442), % predicted PEFR (r=-0.332), right upper lobe apical segmental bronchus (RB1)-wall area (WA)/BSA (r=0.467), %RB1-WA (r=0.395), and RB1-bronchial wall thickness (BWT)/BSA (r=0.378). The score showed no correlation with BC(exp) and other morphologic bronchial parameters. Area under receiver-operating-characteristic curve 0.724 (95% CI) showed that the score of 110 could discriminate patients with PEFR of <60% predicted from those with PEFR of ≥60% predicted. CONCLUSION:During AE, there was a high prevalence of extensive AT(exp) which was correlated with patient's age, BMI, BSA, AE severity and RB1 morphology but not correlated with BC(exp).

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Suwatanapongched T,Thongprasert C,Lertpongpiroon S,Muntham D,Kiatboonsri S

doi

10.1016/j.ejrad.2015.09.008

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

2671-8

issue

12

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(15)30100-5

journal_volume

84

pub_type

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