A Cross-sectional Study to Assess the Proportion and Clinical Characteristics of Asthma and COPD Overlap for Patients With Asthma and COPD in Hong Kong.
This study is to assess the prevalence of Asthma COPD Overlap in subjects with diagnosed asthma and chronic obstructive pulmonary disease (COPD). The subsequent morbidity and mortality of subjects will be followed up for 3 years.
⁃ Subjects must fulfil all of the following criteria:
• All patients with confirmed diagnosis of COPD (post-bronchodilator FEV1/FVC\<0.7 based on the medical records) 1 or asthma (defined as those with a consistent history and prior documented evidence of variable airflow obstruction, with evidence of an increase in FEV1 greater than 12% or 400 mL following bronchodilator or bronchial hyperresponsiveness on bronchial provocation testing, when stable) 6
• Aged \>40 years old
• Signed written informed consent to participate in the study