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.
Age
18–80
Sex
ALL
Healthy volunteers
Accepted
You may be eligible if
1. Patients suspected of asthma who require bronchial challenge testing.
2. The Bronchodilator responsiveness testing is negative.
3. patients with a pre-bronchodilator FEV1 \>60% predicted.
4. No contraindications for bronchial provocation test examination.
5. Fully understand the purpose and significance of this study, and voluntarily participate in the research.
You may not be if
1\. patients with a pre-bronchodilator FEV1≤60% predicted.
1. Contraindications for bronchial challenge testing.
