A clinical diagnosis based on:
1. Recurrent wheezing, difficulty breathing, chest tightness or cough, more and contact allergens, cold air, physical, chemical stimulation, viral upper respiratory tract infections, exercise and other relevant.
2. Second, attack the lungs can be heard, and scattered diffuse, with expiratory wheezing sound-based, breath-phase extension.
3. Third, using anti-asthmatic drugs can significantly relieve symptoms.
Meet the above three conditions can be established clinical diagnosis. Followed up after treatment by the response in line with the laws of asthma, to determine diagnosis.
Second, to help asthma diagnosed examination:
Symptoms of atypical cases (such as wheezing, and no obvious signs), select the following check should be specific, at least the following three in a positive light and asthma treatment can relieve symptoms and improve lung function, can determine the diagnosis.
1. Bronchial provocation test or exercise test positive: bronchial provocation test often used histamine or methacholine inhalation. The cumulative dose of inhaled mol methacholine concentration 8mg/ml within the pulmonarymhistamine or 7.8 20% decrease of airway hyper-responsiveness, and is³function (FEV1) were strong evidence to support bronchial asthma generally applies to ventilation function normal predictive value of 70% or more of patients.
2. 2 agonists after 15 minutes, orbBronchodilation test was positive: inhaled strengthen anti-asthmatic treatment (including hormone use, it is also known as hormone tests) 1-2 weeks later, EFV1 increased by 15% or more, and the absolute increase of> = 200ml positive for exacerbation, EFV1 <60% predictive value of normal persons;
3. PEFR day or circadian fluctuations in the rate of mutation rate ≥ 20%.
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