Chronic obstructive pulmonary disease
Risk factors for the development of COPD include cigarette smoke exposure (primary or secondary) and occupational exposures (organic and inorganic dusts, chemical fumes, and smoke) as well as biomass fuel exposure in the developed setting.
Most patients with COPD present with cough and dyspnea, symptoms that often have developed insidiously by the time the patient finally presents to care. Chronic daily cough is predictive of frequent exacerbations. Per the Global Initiative on Obstructive Lung Disease (GOLD) guidelines, a post-bronchodilator forced expiratory volume in 1 second (FEV-1) / forced vital capacity (FVC) ratio of less than 70% defines COPD. The FEV-1 (% predicted) determines severity.
Eosinophilic COPD represents a distinct subgroup of COPD patients with increased corticosteroid response. It has been labeled as a part of the asthma-COPD overlap syndrome, although these patients are often notable for having serum eosinophilia of >3%. Of note, unlike other patients with asthma-COPD overlap syndrome, eosinophilic COPD patients tend to be older and have fewer environmental allergies and fewer overall exacerbations. It is not clear that these subcategories of COPD should impact the approach to management, however.
For more information, see OMIM.
J44.9 – Chronic obstructive pulmonary disease, unspecified
413846005 – Chronic Obstructive Pulmonary Disease
- Asthma – Typically at least partially reversible airflow obstruction and more allergic overlay; can co-exist with COPD in the asthma-COPD overlap syndrome.
- Chronic bronchitis with normal spirometry
- Central airway obstruction – Symptoms generally do not improve with inhaled bronchodilators; flow volume loops can show changes demonstrating central airway obstruction.
- Congestive heart failure – Usually a restrictive pattern on pulmonary function tests.
- Constrictive bronchiolitis / bronchiolitis obliterans – Usually seen following organ or stem cell transplant, after inhalational injury, or in context of a rheumatologic disorder such as rheumatoid arthritis or inflammatory bowel disease.
- Diffuse panbronchiolitis – Generally nonsmokers; commonly have coexistent sinusitis.
- Lymphangioleiomyomatosis – Seen in women of childbearing age. Centrilobular thin-walled cysts can be mistaken for emphysematous blebs. Can lead to pneumothorax. Airflow obstruction is generally mild.
Last Updated: 11/09/2017