A prospective observational study on acute exacerbation of chronic obstructive pulmonary disease in pulmonology department of tertiary care hospital
Abstract Background Chronic obstructive pulmonary disease (COPD) is a common, preventable, and treatable disease that is characterized by persistent respiratory symptoms and airflow limitation that is due to airway and/or alveolar abnormalities usually caused by significant exposure to noxious particles or gasses.An acute exacerbation of COPD refer