1.Definition
A special type of asthma in which cough is the only or main clinical manifestation, without obvious symptoms or signs such as wheezing and shortness of breath, but with airway hyperresponsiveness.
2.Typical symptoms: irritating dry cough
cough is usually more intense.
Nocturnal cough as its important feature.
Cold, cold air, dust and oil fumes can easily induce or aggravate coughing.
3. Clinical features.
Seasonality in some patients.
Pulmonary ventilation function tests may be normal.
Histamine or acetylcholine bronchial excitation test (+).
Poor effect of conventional treatment such as anti-infection and cough suppression.
diagnostic application of bronchodilators may lead to relief or disappearance of the cough.
Approximately 30-50% of CVAs may develop into classic bronchial asthma.
Diagnosis.
1. cough lasting more than 8 weeks without wheezing and dyspnea.
2. absence of previous symptoms such as wheezing and dyspnea.
3, no history of acute upper respiratory tract infection within the last 8 weeks.
4. increased airway responsiveness.
5, effective treatment with bronchodilators.
6, normal cough sensitivity.
7, no abnormalities on chest X-ray.