The purpose of this study was to examine whether electrical impedance tomography (EIT) was capable of identifying the deteriorated lung function on a regional level during bronchial challenge testing and whether EIT may provide additional information during bronchial challenge testing and identify spatial and temporal heterogeneity of regional lung function.
The content of this study includes: 1. Can EIT identify the uneven ventilation caused by airway contraction in patients during bronchial provocation tests. 2. Can EIT monitor airway contraction in patients before Spirometer examination after inhaling activators. 3. Can EIT observe uneven ventilation caused by airway contraction through tidal breathing after the patient inhales activator.
Study Type
OBSERVATIONAL
Enrollment
100
global inhomogeneity index （GI）
Measured by EIT, used to describe the overall degree of spatial heterogeneity of ventilation.
Time frame: 1day
forced expiratory volume in 1s (FEV1)
The forced expiratory volume in 1s measured during pulmonary function tests.
Time frame: 1day
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